IF statement in MySQL trigger -

this query code in mysql trigger.

if 1=2     select 'yes'; else     select 'no'; end if; 

but has following error:

if '1'='2'    select 'yes' error code: 1064. have error in sql syntax; check manual corresponds mysql server version right syntax use near 'if '1'='2'    select 'yes'' @ line 1 0.000 sec 

what solution?