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ALTER TABLE .. DROP CONSTRAINT IF EXISTS

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

A popular subclause of DDL statements that jOOQ can usually emulate, is the IF EXISTS clause:

Dialect support

This example using jOOQ:

alterTable("t").dropConstraintIfExists("c")

Translates to the following dialect specific expressions:

Aurora Postgres, CockroachDB, H2, MariaDB, Postgres

ALTER TABLE t DROP CONSTRAINT IF EXISTS c

BigQuery, ClickHouse

ALTER TABLE t DROP PRIMARY KEY

DB2

BEGIN
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42703' BEGIN END;
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
  EXECUTE IMMEDIATE '
    ALTER TABLE t DROP CONSTRAINT c
  ';
END

Firebird

EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    ALTER TABLE t DROP CONSTRAINT c
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

Hana

DO BEGIN
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 257 BEGIN END;
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 260 BEGIN END;
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 397 BEGIN END;
  EXECUTE IMMEDIATE '
    ALTER TABLE t DROP CONSTRAINT c
  ';
END;

Oracle

BEGIN
  EXECUTE IMMEDIATE '
    ALTER TABLE t DROP CONSTRAINT c
  ';
EXCEPTION
  WHEN others THEN
    IF sqlerrm LIKE 'ORA-00904%' THEN NULL;
    ELSIF sqlerrm LIKE 'ORA-02443%' THEN NULL;
    ELSE RAISE;
    END IF;
END;

SQLServer

BEGIN TRY
  EXEC sp_executesql N'
    ALTER TABLE t DROP CONSTRAINT c
  ';
END TRY
BEGIN CATCH
  IF error_number() != 4924 and error_number() != 3728 and error_number() != 3727 THROW;
END CATCH

YugabyteDB

DO $$
BEGIN
  ALTER TABLE t DROP CONSTRAINT c;
EXCEPTION
  WHEN SQLSTATE '42704' THEN NULL;
END $$

ASE, Access, Aurora MySQL, Derby, DuckDB, Exasol, HSQLDB, Informix, MemSQL, MySQL, Redshift, SQLDataWarehouse, SQLite, Snowflake, Sybase, Teradata, Trino, Vertica

/* UNSUPPORTED */
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