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 requires the TRIGGER privilege (prior to MySQL 5.1.22, it requires the SUPER privilege). The LIKE clause, if present, indicates which table 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 in Section 19.28, “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
            sql_mode:
             Definer: myname@localhost
character_set_client: latin1
collation_connection: latin1_swedish_ci
  Database Collation: latin1_swedish_ci

character_set_client is the session value of the character_set_client system variable when the trigger was created. collation_connection is the session value of the collation_connection system variable when the trigger was created. Database Collation is the collation of the database with which the trigger is associated. These columns were added in MySQL 5.1.21.

mysql> SHOW TRIGGERS LIKE 'ins%';
Empty set (0.01 sec)

A brief explanation of the columns in the output of this statement is shown here:

See also Section 19.16, “The INFORMATION_SCHEMA TRIGGERS Table”.