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PostgreSQL cheat sheet
This commit is contained in:
Ruhul Amin Parvez
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GitHub
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commit
c8dcfa1a68
@@ -21,21 +21,21 @@ Query data in columns c1, c2 form a table
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```
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SELECT * FROM t;
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```
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#### Query all rows and columns from a table
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Query all rows and columns from a table
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<hr>
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```
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SELECT c1, c2 FROM t
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WHERE condition;
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```
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#### Query data and filter rows with a condition
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Query data and filter rows with a condition
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<hr>
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```
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SELECT DISTINCT c1 FROM t
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WHERE condition;
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```
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#### Query distinct rows from a table
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Query distinct rows from a table
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<hr>
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```
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@@ -43,7 +43,7 @@ SELECT c1, c2
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FROM t
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ORDER BY c1 ASC[DESC];
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```
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#### Sort the result set in ascending or descending order
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Sort the result set in ascending or descending order
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<hr>
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```
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@@ -52,7 +52,7 @@ FROM t
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ORDER BY c1
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LIMIT n OFFSET offset;
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```
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#### Skip offset of rows and return the next n rows
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Skip offset of rows and return the next n rows
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<hr>
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```
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@@ -60,7 +60,7 @@ SELECT c1, aggregate(c2)
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FROM t
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GROUP BY c1;
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```
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#### Group rows using in aggregate function
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Group rows using in aggregate function
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<hr>
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```
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@@ -69,10 +69,10 @@ FROM t
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GROUP BY c1
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HAVING condition;
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```
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#### Filter groups using HAVING clause
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Filter groups using HAVING clause
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</details>
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### QUERYING FROM MULTIPLE TABLES
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### 2️⃣ QUERYING FROM MULTIPLE TABLES
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<details>
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<summary>View Queries </summary>
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@@ -81,7 +81,7 @@ SELECT c1, c2
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FROM t1
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INNER JOIN t2 ON condition;
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```
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#### Inner join t1 and t2
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Inner join t1 and t2
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<hr>
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```
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@@ -89,7 +89,7 @@ SELECT c1, c2
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FROM t1
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LEFT JOIN t2 ON condition;
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```
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#### Left join t1 and t1
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Left join t1 and t1
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<hr>
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```
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@@ -97,7 +97,7 @@ SELECT c1, c2
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FROM t1
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RIGHT JOIN t2 ON condition;
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```
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#### Right join t1 and t2
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Right join t1 and t2
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<hr>
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```
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@@ -105,7 +105,7 @@ SELECT c1, c2
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FROM t1
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FULL OUTER JOIN t2 ON condition;
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```
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#### Perform full outer join
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Perform full outer join
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<hr>
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```
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@@ -113,14 +113,14 @@ SELECT c1, c2
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FROM t1
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CROSS JOIN t2;
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```
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#### Produce a Cartesian product of rows in tables
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Produce a Cartesian product of rows in tables
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<hr>
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```
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SELECT c1, c2
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FROM t1, t2;
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```
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#### Another way to perform cross join
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Another way to perform cross join
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<hr>
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```
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@@ -128,11 +128,11 @@ SELECT c1, c2
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FROM t1 A
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INNER JOIN t2 B ON condition;
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```
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#### Join t1 to itself using INNER JOIN clause
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Join t1 to itself using INNER JOIN clause
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</details>
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### USING SQL OPERATORS
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### 3️⃣ USING SQL OPERATORS
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<details>
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<summary>View Queries </summary>
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@@ -142,7 +142,7 @@ FROM t1
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UNION [ALL]
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SELECT c1, c2 FROM t2;
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```
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#### Combine rows from tow queries
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Combine rows from tow queries
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<hr>
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```
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@@ -150,7 +150,7 @@ SELECT c1, c2 FROM t1
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INTERSECT
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SELECT c1, c2 FROM t2;
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```
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#### Return the intersection of two queries
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Return the intersection of two queries
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<hr>
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```
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@@ -158,39 +158,38 @@ SELECT c1, c2 FROM t1
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EXCEPT
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SELECT c1,c2 FROM t2;
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```
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#### Subtract a result set from another result set
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Subtract a result set from another result set
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<hr>
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```
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SELECT c1, c2 FROM t
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WHERE c1[NOT] LIKE pattern;
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```
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#### Query rows using pattern matching %, _
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Query rows using pattern matching %, _
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<hr>
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```
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SELECT c1, c2 FROM t
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WHERE c1[NOT] IN value_list;
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```
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#### Query rows in a list
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Query rows in a list
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<hr>
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```
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SELECT c1, c2 FROM t
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WHERE c1 BETWEEN low_value AND high_value;
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```
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#### Query rows between two values
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Query rows between two values
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<hr>
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```
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SELECT c1, c2 FROM t
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WHERE c1 IS [NOT]NULL;
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```
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#### Check if values in a table is NULL or not
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Check if values in a table is NULL or not
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</details>
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### MANAGING TABLES
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### 4️⃣ MANAGING TABLES
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<details>
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<summary>View Queries</summary>
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@@ -201,58 +200,58 @@ CREATE TABLE(
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price NUMERIC(10,2) DEFAULT 0
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);
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```
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#### Create a new table with three columns
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Create a new table with three columns
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<hr>
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```
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DROP TABLE t CASCADE;
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```
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#### Delete the table from the database
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Delete the table from the database
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<hr>
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```
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ALTER TABLE t ADD column;
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```
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#### Add a new column to the table
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Add a new column to the table
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<hr>
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```
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ALTER TABLE t DROP COLUMN c;
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```
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#### Drop column c from the table
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Drop column c from the table
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<hr>
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```
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ALTER TABLE t ADD contraint;
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```
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#### Add a constraint
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Add a constraint
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<hr>
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```
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ALTER TABLE t DROP constraint;
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```
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#### Drop a constraint
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Drop a constraint
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<hr>
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```
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ALTER TABLE t1 RENAME TO t2;
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```
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#### Rename a table from t1 to t2
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Rename a table from t1 to t2
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<hr>
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```
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ALTER TABLE t1 RENAME c1 to c2;
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```
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#### Rename column c1 to c2
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Rename column c1 to c2
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<hr>
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```
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TRUNCATE TABLE t CASCADE;
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```
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#### Remove all data in a table
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Remove all data in a table
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</details>
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### USING SQL CONSTRAINTS
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### 5️⃣ USING SQL CONSTRAINTS
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<details>
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<summary>View Queries</summary>
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@@ -262,7 +261,7 @@ CREATE TABLE t(
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PRIMARY KEY(c1, c2)
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);
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```
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#### Set c1 and c2 as a primary key
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Set c1 and c2 as a primary key
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<hr>
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```
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@@ -272,7 +271,7 @@ CREATE TABLE t1(
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FOREIGN KEY (c2) REFERENCES ts(c2)
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);
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```
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#### Set c2 column as a foreign key
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Set c2 column as a foreign key
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<hr>
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```
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@@ -281,7 +280,7 @@ CREATE TABLE t(
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UNIQUE(c2, c3)
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);
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```
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#### Make the values in c1 and c2 unique
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Make the values in c1 and c2 unique
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<hr>
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```
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@@ -290,7 +289,7 @@ CREATE TABLE t(
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CHECK(c1 > 0 AND c1 >= c2)
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);
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```
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#### Ensure c1 > 0 and values in c1 >= c2
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Ensure c1 > 0 and values in c1 >= c2
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<hr>
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```
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@@ -299,10 +298,10 @@ CREATE TABLE t(
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c2 VARCHAR NOT NULL
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);
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```
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#### Set values in c2 column not null
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Set values in c2 column not null
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</details>
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### MODIFIYING DATA
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### 6️⃣ MODIFIYING DATA
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<details>
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<summary>View Queries</summary>
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@@ -310,7 +309,7 @@ CREATE TABLE t(
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INSERT INTO t(column_list)
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VALUES(value_list);
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```
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#### Insert one row into a table
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Insert one row into a table
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<hr>
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```
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@@ -318,7 +317,7 @@ INSERT INTO t(column_list)
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VALUES(value_list),
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(value_list), ....;
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```
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#### Insert multiple rows into a table
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Insert multiple rows into a table
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<hr>
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```
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@@ -326,14 +325,14 @@ INSERT INTO t1(column_list)
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SELECT column_list
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FROM t2;
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```
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#### Insert rows from t2 into t1
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Insert rows from t2 into t1
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<hr>
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```
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UPDATE t
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SET c1 = new_value;
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```
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#### Update new value in the column c1 for all rows
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Update new value in the column c1 for all rows
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<hr>
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```
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@@ -342,23 +341,23 @@ SET c1 = new_value,
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c2 = new_value
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WHERE condition;
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```
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#### Update values in the column c1, c2 that match the condition
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Update values in the column c1, c2 that match the condition
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<hr>
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```
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DELETE FROM t;
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```
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#### Delete all data in a table
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Delete all data in a table
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<hr>
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```
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DELETE FROM t
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WHERE condition;
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```
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#### Delete subset of rows in a table
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Delete subset of rows in a table
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</details>
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### MANAGING VIEWS
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### 7️⃣ MANAGING VIEWS
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<details>
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<summary>View Queries</summary>
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@@ -368,7 +367,7 @@ AS
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SELECT c1, c2
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FROM t;
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```
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#### Create a new view that consists of c1 and c2
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Create a new view that consists of c1 and c2
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<hr>
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```
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@@ -378,7 +377,7 @@ SELECT c1, c2
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FROM t
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WITH[CASCADED | LOCAL]CHECK OPTION;
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```
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#### Create a new view with check option
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Create a new view with check option
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<hr>
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```
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@@ -388,7 +387,7 @@ select-statement --anchor part
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UNION[ALL]
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select-statement; --recursive part
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```
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#### Create a recursive view
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Create a recursive view
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<hr>
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```
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@@ -397,17 +396,17 @@ AS
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SELECT c1, c2
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FROM t;
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```
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#### Create a temporary view
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Create a temporary view
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<hr>
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```
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DROP VIEW view_name;
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```
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#### Delete a view
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Delete a view
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</details>
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### MANAGING INDEXES
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### 8️⃣ MANAGING INDEXES
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<details>
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<summary>View Queries</summary>
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@@ -415,24 +414,24 @@ DROP VIEW view_name;
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CREATE INDEX inx_name
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ON t(c1, c2);
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```
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#### Create an index on c1 and c2 of the table t
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Create an index on c1 and c2 of the table t
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<hr>
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```
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CREATE UNIQUE INDEX inx_name
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ON t(c3, c4);
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```
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#### Create unique index on c3, c4 of the table t
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Create unique index on c3, c4 of the table t
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<hr>
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```
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DROP INDEX idx_name;
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```
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#### Drop an index
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Drop an index
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</details>
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### MANAGING TRIGGERS
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### 9️⃣ MANAGING TRIGGERS
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<details>
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<summary>View Queries</summary>
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@@ -442,7 +441,7 @@ WHEN EVENT
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ON table_name TRIGGER_TYPE
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EXECUTE stored_procedure;
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```
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#### Create or modify a trigger
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Create or modify a trigger
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<hr>
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```
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@@ -473,17 +472,17 @@ BEFORE INSERT
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ON person FOR EACH ROW
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EXECUTE stored_procedure;
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```
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#### Create a trigger invoked before a new row is inserted into the person table
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Create a trigger invoked before a new row is inserted into the person table
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<hr>
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```
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DROP TRIGGER trigger_name
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```
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#### Delete a specific trigger
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Delete a specific trigger
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</details>
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### SQL AGGREGATE FUNCTIONS
|
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### 🔟 SQL AGGREGATE FUNCTIONS
|
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<details>
|
||||
<summary>View Queries</summary>
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Reference in New Issue
Block a user