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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.

// Drop a table
create.dropTableIfExists("table").execute();

Dialect support

This example using jOOQ:

dropTableIfExists("table")

Translates to the following dialect specific expressions:

Access

DROP TABLE table

Aurora MySQL, Aurora Postgres, CockroachDB, DuckDB, Exasol, H2, HSQLDB, Informix, MariaDB, MemSQL, MySQL, Oracle, Postgres, Snowflake, Sybase, Vertica, YugabyteDB

DROP TABLE IF EXISTS table

DB2

BEGIN
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42704' BEGIN END;
  EXECUTE IMMEDIATE '
    DROP TABLE table
  ';
END

Firebird

EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    DROP TABLE table
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

Hana

DO BEGIN
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 259 BEGIN END;
  EXECUTE IMMEDIATE '
    DROP TABLE table
  ';
END;

SQLDataWarehouse

BEGIN TRY
  DROP TABLE table
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

SQLite

DROP TABLE IF EXISTS "table"

SQLServer

BEGIN TRY
  DROP TABLE table
END TRY
BEGIN CATCH
  IF error_number() != 3701 THROW;
END CATCH

ASE, BigQuery, Derby, Redshift, Teradata, Trino

/* UNSUPPORTED */

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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