some useful SQL commands

SQL Command is most common and important part of sql. Here are some useful SQL command with very short description.
SQL query

Command Desc.
ABORT abort the current transaction
ALTER DATABASE change a database
ALTER GROUP add users to a group or remove users from a group
ALTER TABLE change the definition of a table
ALTER TRIGGER change the definition of a trigger
ALTER USER change a database user account
ANALYZE collect statistics about a database
BEGIN start a transaction block
CHECKPOINT force a transaction log checkpoint
CLOSE close a cursor
CLUSTER cluster a table according to an index
COMMENT define or change the comment of an object
COMMIT commit the current transaction
COPY copy data between files and tables
CREATE AGGREGATE define a new aggregate function
CREATE CAST define a user-defined cast
CREATE CONSTRAINT TRIGGER define a new constraint trigger
CREATE CONVERSION define a user-defined conversion
CREATE DATABASE create a new database
CREATE DOMAIN define a new domain
CREATE FUNCTION define a new function
CREATE GROUP define a new user group
CREATE INDEX define a new index
CREATE LANGUAGE define a new procedural language
CREATE OPERATOR define a new operator
CREATE OPERATOR CLASS define a new operator class for indexes
CREATE RULE define a new rewrite rule
CREATE SCHEMA define a new schema
CREATE SEQUENCE define a new sequence generator
CREATE TABLE define a new table
CREATE TABLE AS create a new table from the results of a query
CREATE TRIGGER define a new trigger
CREATE TYPE define a new data type
CREATE USER define a new database user account
CREATE VIEW define a new view
DEALLOCATE remove a prepared query
DECLARE define a cursor
DELETE delete rows of a table
DROP AGGREGATE remove a user-defined aggregate function
DROP CAST remove a user-defined cast
DROP CONVERSION remove a user-defined conversion
DROP DATABASE remove a database
DROP DOMAIN remove a user-defined domain
DROP FUNCTION remove a user-defined function
DROP GROUP remove a user group
DROP INDEX remove an index
DROP LANGUAGE remove a user-defined procedural language
DROP OPERATOR remove a user-defined operator
DROP OPERATOR CLASS remove a user-defined operator class
DROP RULE remove a rewrite rule
DROP SCHEMA remove a schema
DROP SEQUENCE remove a sequence
DROP TABLE remove a table
DROP TRIGGER remove a trigger
DROP TYPE remove a user-defined data type
DROP USER remove a database user account
DROP VIEW remove a view
END commit the current transaction
EXECUTE execute a prepared query
EXPLAIN show the execution plan of a statement
FETCH retrieve rows from a table using a cursor
GRANT define access privileges
INSERT create new rows in a table
LISTEN listen for a notification
LOAD load or reload a shared library file
LOCK explicitly lock a table
MOVE position a cursor on a specified row of a table
NOTIFY generate a notification
PREPARE create a prepared query
REINDEX rebuild corrupted indexes
RESET restore the value of a run-time parameter to a default value
REVOKE remove access privileges
ROLLBACK abort the current transaction
SELECT retrieve rows from a table or view
SELECT INTO create a new table from the results of a query
SET change a run-time parameter
SET CONSTRAINTS set the constraint mode of the current transaction
SET SESSION AUTHORIZATION set the session user identifier and the current user identifier of the current session
SET TRANSACTION set the characteristicsof the current transaction
SHOW show the value of a run-time parameter
START TRANSACTION start a transaction block
TRUNCATE empty a table
UNLISTEN stop listening for a notification
UPDATE update rows of a table
VACUUM garbage-collectand optionally analyze a database

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