Error:

ERROR QUERY:

SELECT * FROM postcodes LEFT JOIN koppelskill ON (postcodes.regio=koppelskill.regio) WHERE woonplaats=''t Zand' AND klanten_id='495521' ;
ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 't Zand' AND klanten_id='495521'' at line 3

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 't Zand' AND klanten_id='495521'' at line 3