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DROP INDEX IF EXISTS
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
For idempotent execution of DDL scripts, the useful IF EXISTS clause is supported by jOOQ, and emulated using an anonymous, procedural block if possible.
// Drop an index
create.dropIndexIfExists("index").execute();
Dialect support
This example using jOOQ:
dropIndexIfExists("index")
Translates to the following dialect specific expressions:
Access
DROP INDEX index
Aurora Postgres, ClickHouse, CockroachDB, DuckDB, H2, HSQLDB, Informix, MariaDB, Oracle, Postgres, SQLite, Sybase, YugabyteDB
DROP INDEX IF EXISTS index
DB2
BEGIN
DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
EXECUTE IMMEDIATE '
DROP INDEX index
';
END
Firebird
EXECUTE BLOCK
AS
BEGIN
EXECUTE STATEMENT '
DROP INDEX index
';
WHEN sqlcode -607 DO
BEGIN END
END
Hana
DO BEGIN
DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 261 BEGIN END;
EXECUTE IMMEDIATE '
DROP INDEX index
';
END;
MySQL
CREATE PROCEDURE block_1734679699541_3390394() MODIFIES SQL DATA BEGIN DECLARE CONTINUE HANDLER FOR SQLSTATE '42000' BEGIN END; DROP INDEX index; END; CALL block_1734679699541_3390394(); DROP PROCEDURE block_1734679699541_3390394;
SQLDataWarehouse
BEGIN TRY
DROP INDEX index
END TRY
BEGIN CATCH
IF error_number() != 3701 BEGIN
DECLARE @ErrorMessage NVARCHAR(4000) = ERROR_MESSAGE();
DECLARE @ErrorSeverity INT = ERROR_SEVERITY();
DECLARE @ErrorState INT = ERROR_STATE();
RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState);
END;
END CATCH
SQLServer
BEGIN TRY DROP INDEX index END TRY BEGIN CATCH IF error_number() != 3701 THROW; END CATCH
ASE, Aurora MySQL, BigQuery, Derby, Exasol, MemSQL, Redshift, Snowflake, Teradata, Trino, Vertica
/* UNSUPPORTED */
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