Syntax:
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 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
http://dev.mysql.com/doc/refman/5.5/en/extended-show.html.

For the trigger ins_sum as defined in
http://dev.mysql.com/doc/refman/5.5/en/triggers.html, 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

URL: http://dev.mysql.com/doc/refman/5.5/en/show-triggers.html

