Specify NOPARALLEL to reset parallelism to default values. If you specify PARALLEL without including a degree of parallelism, the index uses default parallelism. You can also specify the degree of parallelism by setting the parallel_workers parameter when performing a parallel scan on a table. Specify PARALLEL to select a degree of parallelism. The name (possibly schema-qualified) of an existing table to alter.Īutomatically drop objects that depend on the dropped constraint. You must own the table to use ALTER TABLE. ON AUTHORIZATION command to alter a trigger's implicit object owner. However, when the ownership of a table is changed, the ownership of the trigger's implicit objects is updated when they're matched with a table owner owning a trigger. reloptions shows the parallel_workers parameter as 0.Ī superuser has permission to create a trigger on any user's table, but a user can create a trigger only on the table they own. The NOPARALLEL clause resets the values to their defaults. The PARALLEL clause sets the degree of parallelism for a table. The RENAME forms change the name of a table (or an index, sequence, or view) or the name of a column in a table. Currently, constraints on tables don't need unique names, so there might be more than one constraint matching the specified name. Indexes and table constraints involving the column are dropped as well. This form adds a column to the table using the same syntax as CREATE TABLE.

Toggle Wrap Copy ADD ] DROP COLUMN ADD DROP CONSTRAINT DescriptionĪLTER TABLE changes the definition of an existing table.

Postgres add constraint