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15.7.7.39 SHOW TRIGGERS Statement

SHOW TRIGGERS    [{FROM | IN}db_name]    [LIKE 'pattern' | WHEREexpr]

SHOW TRIGGERS lists the triggers currently defined for tables in a database (the default database unless aFROM clause is given). This statement returns results only for databases and tables for which you have theTRIGGER privilege. TheLIKE clause, if present, indicates which table names (not trigger names) to match and causes the statement to display triggers for those tables. TheWHERE clause can be given to select rows using more general conditions, as discussed inSection 28.8, “Extensions to SHOW Statements”.

For theins_sum trigger defined inSection 27.4, “Using Triggers”, the output ofSHOW TRIGGERS is as shown here:

mysql> SHOW TRIGGERS LIKE 'acc%'\G*************************** 1. row ***************************             Trigger: ins_sum               Event: INSERT               Table: account           Statement: SET @sum = @sum + NEW.amount              Timing: BEFORE             Created: 2018-08-08 10:10:12.61            sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,                      NO_ZERO_IN_DATE,NO_ZERO_DATE,                      ERROR_FOR_DIVISION_BY_ZERO,                      NO_ENGINE_SUBSTITUTION             Definer: me@localhostcharacter_set_client: utf8mb4collation_connection: utf8mb4_0900_ai_ci  Database Collation: utf8mb4_0900_ai_ci

SHOW TRIGGERS output has these columns:

  • Trigger

    The name of the trigger.

  • Event

    The trigger event. This is the type of operation on the associated table for which the trigger activates. The value isINSERT (a row was inserted),DELETE (a row was deleted), orUPDATE (a row was modified).

  • Table

    The table for which the trigger is defined.

  • Statement

    The trigger body; that is, the statement executed when the trigger activates.

  • Timing

    Whether the trigger activates before or after the triggering event. The value isBEFORE orAFTER.

  • Created

    The date and time when the trigger was created. This is aTIMESTAMP(2) value (with a fractional part in hundredths of seconds) for triggers.

  • sql_mode

    The SQL mode in effect when the trigger was created, and under which the trigger executes. For the permitted values, seeSection 7.1.11, “Server SQL Modes”.

  • Definer

    The account of the user who created the trigger, in'user_name'@'host_name' format.

  • character_set_client

    The session value of thecharacter_set_client system variable when the trigger was created.

  • collation_connection

    The session value of thecollation_connection system variable when the trigger was created.

  • Database Collation

    The collation of the database with which the trigger is associated.

Trigger information is also available from theINFORMATION_SCHEMATRIGGERS table. SeeSection 28.3.44, “The INFORMATION_SCHEMA TRIGGERS Table”.