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ALTER TABLE .. ALTER COLUMN .. DROP NOT NULL
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
An existing column's NOT NULL constraint can be dropped using the ALTER TABLE's NOT NULL clause on a column:
// Drop the not null constraint on a column
create.alterTable("table").alter("column").dropNotNull().execute();
Dialect support
This example using jOOQ:
alterTable("t").alter("c").dropNotNull()
Translates to the following dialect specific expressions:
ASE, Oracle
ALTER TABLE t MODIFY c NULL
Aurora Postgres, CockroachDB, DB2, Derby, DuckDB, Firebird, H2, HSQLDB, Postgres, Snowflake, YugabyteDB
ALTER TABLE t ALTER c DROP NOT NULL
Exasol
ALTER TABLE t MODIFY c DROP NOT NULL
Vertica
ALTER TABLE t ALTER COLUMN c DROP NOT NULL
Access, Aurora MySQL, BigQuery, ClickHouse, Hana, Informix, MariaDB, MemSQL, MySQL, Redshift, SQLDataWarehouse, SQLServer, SQLite, Sybase, Teradata, Trino
/* UNSUPPORTED */
Generated with jOOQ 3.20. Translate your own SQL on our website
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