MySQL :: MySQL 8.0 Reference Manual :: 15.7.7.40 SHOW TRIGGERS Statement (original) (raw)

15.7.7.40 SHOW TRIGGERS Statement

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

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

For the ins_sum trigger defined inSection 27.3, “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@localhost
character_set_client: utf8mb4
collation_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 is INSERT (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 is BEFORE 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, see Section 7.1.11, “Server SQL Modes”.
• Definer
  The account of the user who created the trigger, in'_`username`_'@'_`hostname`_' 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_SCHEMA TRIGGERS table. SeeSection 28.3.45, “The INFORMATION_SCHEMA TRIGGERS Table”.