ALTER TABLE

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

The ALTER TABLE statement is certainly the most powerful among DDL statements, as tables are the most important object type in a database catalog.

Table of contents

4.4.1.4.1.

ALTER TABLE .. ADD COLUMN

4.4.1.4.2.

ALTER TABLE .. ADD COLUMN .. FIRST, BEFORE, AFTER (new)

4.4.1.4.3.

ALTER TABLE .. ADD COLUMNS

4.4.1.4.4.

ALTER TABLE .. ADD COLUMN IF NOT EXISTS

4.4.1.4.5.

ALTER TABLE .. ADD PRIMARY KEY

4.4.1.4.6.

ALTER TABLE .. ADD UNIQUE

4.4.1.4.7.

ALTER TABLE .. ADD FOREIGN KEY

4.4.1.4.8.

ALTER TABLE .. ADD CHECK

4.4.1.4.9.

ALTER TABLE .. RENAME

4.4.1.4.10.

ALTER TABLE .. COMMENT

4.4.1.4.11.

ALTER TABLE .. ALTER COLUMN .. SET DEFAULT

4.4.1.4.12.

ALTER TABLE .. ALTER COLUMN .. DROP DEFAULT (new)

4.4.1.4.13.

ALTER TABLE .. ALTER COLUMN .. SET NOT NULL

4.4.1.4.14.

ALTER TABLE .. ALTER COLUMN .. DROP NOT NULL

4.4.1.4.15.

ALTER TABLE .. ALTER COLUMN .. SET TYPE

4.4.1.4.16.

ALTER TABLE .. ALTER CONSTRAINT .. ENFORCED (new)

4.4.1.4.17.

ALTER TABLE .. ALTER CONSTRAINT .. NOT ENFORCED (new)

4.4.1.4.18.

ALTER TABLE .. RENAME COLUMN

4.4.1.4.19.

ALTER TABLE .. RENAME CONSTRAINT

4.4.1.4.20.

ALTER TABLE .. RENAME INDEX

4.4.1.4.21.

ALTER TABLE .. DROP COLUMN

4.4.1.4.22.

ALTER TABLE .. DROP COLUMN RESTRICT

4.4.1.4.23.

ALTER TABLE .. DROP COLUMN CASCADE

4.4.1.4.24.

ALTER TABLE .. DROP COLUMNS

4.4.1.4.25.

ALTER TABLE .. ADD COLUMN IF NOT EXISTS

4.4.1.4.26.

ALTER TABLE .. DROP CONSTRAINT

4.4.1.4.27.

ALTER TABLE .. DROP PRIMARY KEY

4.4.1.4.28.

ALTER TABLE .. DROP UNIQUE (new)

4.4.1.4.29.

ALTER TABLE .. DROP PRIMARY KEY

4.4.1.4.30.

ALTER TABLE .. DROP CONSTRAINT IF EXISTS (new)

4.4.1.4.31.

ALTER TABLE IF EXISTS