ALTER TABLE .. ALTER COLUMN .. DROP DEFAULT
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
An existing column DEFAULT value can be removed from a column using the ALTER TABLE's DROP DEFAULT clause on a column:
// Drop the default from a column
create.alterTable("table").alter("column").dropDefault().execute();
Dialect support
This example using jOOQ:
alterTable("t").alter("c").dropDefault()
Translates to the following dialect specific expressions:
Access, Aurora Postgres, CockroachDB, DB2, Derby, DuckDB, Exasol, Firebird, H2, HSQLDB, Postgres, Snowflake, Sybase, YugabyteDB
ALTER TABLE t ALTER c DROP DEFAULT
ASE
ALTER TABLE t REPLACE c DEFAULT NULL
Aurora MySQL, MariaDB, MySQL
ALTER TABLE t ALTER COLUMN c SET DEFAULT NULL
BigQuery, Vertica
ALTER TABLE t ALTER COLUMN c DROP DEFAULT
ClickHouse
ALTER TABLE t MODIFY COLUMN c REMOVE DEFAULT
MemSQL, Oracle
ALTER TABLE t MODIFY c DEFAULT NULL
SQLServer
DECLARE @constraint NVARCHAR(max);
DECLARE @command NVARCHAR(max);
SELECT @constraint = name
FROM sys.default_constraints
WHERE parent_object_id = object_id('t')
AND parent_column_id = columnproperty(object_id('t'), 'c', 'ColumnId');
IF @constraint IS NOT NULL
BEGIN
SET @command = 'ALTER TABLE ' + 't' + ' DROP CONSTRAINT ' + @constraint
EXECUTE sp_executesql @command
SET @command = 'ALTER TABLE ' + 't' + ' ADD CONSTRAINT ' + @constraint + ' DEFAULT ' + NULL + ' FOR ' + 'c'
EXECUTE sp_executesql @command
END
ELSE
BEGIN
SET @command = 'ALTER TABLE ' + 't' + ' ADD DEFAULT ' + NULL + ' FOR ' + 'c'
EXECUTE sp_executesql @command
END
Hana, Informix, Redshift, SQLDataWarehouse, SQLite, Teradata, Trino
/* UNSUPPORTED */
Generated with jOOQ 3.20. Translate your own SQL on our website
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