PostgreSQL triggers functions (e.g.: RI_Fkey_setnull_upd etc..) [closed] - sql

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I am getting acquainted with PostgreSQL.
Trying to find information for trigger functions listed below:
RI_Fkey_cascade_del
RI_Fkey_cascade_upd
RI_Fkey_check_ins
RI_Fkey_check_upd
RI_Fkey_noaction_del
RI_Fkey_noaction_upd
RI_Fkey_restrict_del
RI_Fkey_restrict_upd
RI_Fkey_setdefault_del
RI_Fkey_setdefault_upd
RI_Fkey_setnull_del
RI_Fkey_setnull_upd
suppress_redundant_updates_trigger
trigger_in
tsvector_updates_trigger
tsvector_updates_trigger_column
unique_key_recheck
Google shows me only sources of PGSQL.

suppress_redundant_updates_trigger and tsvector_update_trigger are in the documentation.
trigger_in is a placeholder function associated with the TRIGGER pseudotype, and is never actually called.
The rest are implementation details of foreign key and uniqueness constraints. You should find everything you need to know about these constraints in the documentation. You shouldn't need to know anything about the underlying triggers (and if you do, the only explanation you're likely to find is the source code itself).

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