Updating oracle db

This commit is contained in:
Divya
2023-11-20 20:30:26 +05:30
parent b93b658ee4
commit 0f574aa958

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@@ -14,27 +14,27 @@ Retrieve a list of all schemas in the Oracle Database.
SELECT username FROM all_users; SELECT username FROM all_users;
# Show Current Schema # Show Current Schema
Display the current schema (user) in use. Display the current schema (user) in use.
SHOW USER; SHOW USER;
# Create Schema (User) # Create Schema (User)
Create a new schema (user) in the Oracle Database. Create a new schema (user) in the Oracle Database.
CREATE USER username IDENTIFIED BY password; CREATE USER username IDENTIFIED BY password;
# Switch Schema # Switch Schema
Change the current schema for the session. Change the current schema for the session.
ALTER SESSION SET CURRENT_SCHEMA = username; ALTER SESSION SET CURRENT_SCHEMA = username;
# Drop Schema (User) # Drop Schema (User)
Remove a schema (user) from the Oracle Database, including all owned objects. Remove a schema (user) from the Oracle Database, including all owned objects.
DROP USER username CASCADE; DROP USER username CASCADE;
# Show Tables in Current Schema # Show Tables in Current Schema
Retrieve a list of tables in the current schema. Retrieve a list of tables in the current schema.
SELECT table_name FROM user_tables; SELECT table_name FROM user_tables;
@@ -43,7 +43,7 @@ CRUD
***************************************************************************** *****************************************************************************
# Create Table # Create Table
Define and create a new table in the Oracle Database. Define and create a new table in the Oracle Database.
CREATE TABLE table_name ( CREATE TABLE table_name (
column1 datatype, column1 datatype,
@@ -52,27 +52,27 @@ CREATE TABLE table_name (
); );
# Insert Row # Insert Row
Add a new row with specified values into a table. Add a new row with specified values into a table.
INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...); INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...);
# Select All Rows # Select All Rows
Retrieve all rows from a table. Retrieve all rows from a table.
SELECT * FROM table_name; SELECT * FROM table_name;
# Select Specific Columns # Select Specific Columns
Retrieve specific columns from a table. Retrieve specific columns from a table.
SELECT column1, column2 FROM table_name; SELECT column1, column2 FROM table_name;
# Update Row # Update Row
Modify data in a table by updating a specific row. Modify data in a table by updating a specific row.
UPDATE table_name SET column1 = value1 WHERE condition; UPDATE table_name SET column1 = value1 WHERE condition;
# Delete Row # Delete Row
Remove specific rows from a table based on a condition. Remove specific rows from a table based on a condition.
DELETE FROM table_name WHERE condition; DELETE FROM table_name WHERE condition;