# pg_trigger

The `pg_trigger` system catalog table stores triggers on tables.

**Note:** OushuDB does not support triggers.



Table 1. `pg_catalog.pg_trigger`

| column           | type       | references                                                   | description                                                  |
| :--------------- | :--------- | :----------------------------------------------------------- | :----------------------------------------------------------- |
| `tgrelid`        | oid        | *pg_class_internal.oid*Note that OushuDB does not enforce referential integrity. | The table this trigger is on.                                |
| `tgname`         | name       |                                                              | Trigger name (must be unique among triggers of same table).  |
| `tgfoid`         | oid        | *pg_proc.oid*Note that OushuDB does not enforce referential integrity. | The function to be called.                                   |
| `tgtype`         | smallint   |                                                              | Bit mask identifying trigger conditions.                     |
| `tgenabled`      | boolean    |                                                              | True if trigger is enabled.                                  |
| `tgisconstraint` | boolean    |                                                              | True if trigger implements a referential integrity constraint. |
| `tgconstrname`   | name       |                                                              | Referential integrity constraint name.                       |
| `tgconstrrelid`  | oid        | *pg_class_internal.oid*Note that OushuDB does not enforce referential integrity. | The table referenced by an referential integrity constraint. |
| `tgdeferrable`   | boolean    |                                                              | True if deferrable.                                          |
| `tginitdeferred` | boolean    |                                                              | True if initially deferred.                                  |
| `tgnargs`        | smallint   |                                                              | Number of argument strings passed to trigger function.       |
| `tgattr`         | int2vector |                                                              | Currently not used.                                          |
| `tgargs`         | bytea      |                                                              | Argument strings to pass to trigger, each NULL-terminated.   |