Syntax:
SHOW TRIGGERS [FROM 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 SUPER privilege. It was implemented in MySQL
5.0.10. 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
http://dev.mysql.com/doc/refman/5.0/en/extended-show.html.

For the trigger ins_sum as defined in
http://dev.mysql.com/doc/refman/5.0/en/using-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

URL: http://dev.mysql.com/doc/refman/5.0/en/show-triggers.html

