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Excerpts from this Manual SHOW TRIGGERS Syntax

    [{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 to match (not trigger names) 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 in Section 21.33, “Extensions to SHOW Statements”.

For the trigger ins_sum as defined in Section 20.3, “Using Triggers”, the output of this statement 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: NULL
            sql_mode: NO_ENGINE_SUBSTITUTION
             Definer: me@localhost
character_set_client: utf8
collation_connection: utf8_general_ci
  Database Collation: latin1_swedish_ci

SHOW TRIGGERS output has the following columns:

  • Trigger: The trigger name.

  • Event: The type of operation that causes trigger activation. The value is 'INSERT', 'UPDATE', or 'DELETE'.

  • 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' or 'AFTER'.

  • Created: The value of this column is always NULL.

  • sql_mode: The SQL mode in effect when the trigger executes.

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

  • character_set_client: The session value of the character_set_client system variable when the trigger was created.

  • collation_connection: The session value of the collation_connection system variable when the trigger was created.

  • Database Collation: The collation of the database with which the trigger is associated.

You can also obtain information about trigger objects from INFORMATION_SCHEMA, which contains a TRIGGERS table. See Section 21.26, “The INFORMATION_SCHEMA TRIGGERS Table”.

User Comments
  Posted by Jonathan Nicol on April 30, 2013
"The WHERE clause can be given to select rows using more general conditions, as discussed in Section 20.31, “Extensions to SHOW Statements”. "

You must use backticks on the filtered column name:

WRONG: show triggers where 'Trigger' like 'a%'\G
RIGHT: show triggers where `Trigger` like 'a%'\G
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