[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 if you have the SUPER privilege. It was implemented in MySQL 5.0.10. 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 19.18, “Extensions to SHOW Statements”.

For the trigger ins_sum as defined in Section 18.3, “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
  Definer: me@localhost

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. This column was added in MySQL 5.0.11.

  • Definer: The account that created the trigger. This column was added in MySQL 5.0.17.

You must have the SUPER privilege to execute SHOW TRIGGERS.

You can also obtain information about trigger objects from INFORMATION_SCHEMA, which contains a TRIGGERS table. See Section 19.15, “The INFORMATION_SCHEMA TRIGGERS Table”.

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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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