The jOOQ User Manual SQL building SQL Statements (DDL) The ALTER statement ALTER TABLE ALTER TABLE .. DROP CONSTRAINT

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ALTER TABLE .. DROP CONSTRAINT

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

A constraint can be dropped from the table using the ALTER TABLE's DROP CONSTRAINT clause:

// Drop a constraint
create.alterTable("table").dropConstraint("uk").execute();

Alternative syntaxes are available to restrict dropping only to specific types of constraints:

• DROP PRIMARY KEY
• DROP UNIQUE
• DROP FOREIGN KEY

Dialect support

This example using jOOQ:

alterTable("t").dropConstraint("c")

Translates to the following dialect specific expressions:

ASE, Access, Aurora Postgres, CockroachDB, DB2, Databricks, Derby, Exasol, Firebird, H2, HSQLDB, Hana, Informix, MariaDB, Oracle, Postgres, Redshift, SQLDataWarehouse, SQLServer, Snowflake, Sybase, Teradata, Vertica, YugabyteDB

ALTER TABLE t DROP CONSTRAINT c

BigQuery, ClickHouse

ALTER TABLE t DROP PRIMARY KEY

Aurora MySQL, DuckDB, MemSQL, MySQL, SQLite, Trino

/* UNSUPPORTED */

The jOOQ User Manual SQL building SQL Statements (DDL) The ALTER statement ALTER TABLE ALTER TABLE .. DROP CONSTRAINT

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