| tgrelid | oid | pg_class.oid | The table this trigger is on |
| tgname | name | | Trigger name (must be unique among triggers of same table) |
| tgfoid | oid | pg_proc.oid | The function to be called |
| tgtype | int2 | | Bit mask identifying trigger conditions |
| tgenabled | bool | | True if trigger is enabled |
| tgisconstraint | bool | | True if trigger implements a referential integrity constraint |
| tgconstrname | name | | Referential integrity constraint name |
| tgconstrrelid | oid | pg_class.oid | The table referenced by an referential integrity constraint |
| tgdeferrable | bool | | True if deferrable |
| tginitdeferred | bool | | True if initially deferred |
| tgnargs | int2 | | Number of argument strings passed to trigger function |
| tgattr | int2vector | | Currently unused |
| tgargs | bytea | | Argument strings to pass to trigger, each null-terminated |