Error:

ERROR QUERY:

SELECT * FROM postcodes LEFT JOIN koppelskill ON (postcodes.regio=koppelskill.regio) WHERE woonplaats=''s-Graveland' AND klanten_id='4762' ;
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 's-Graveland' AND klanten_id='4762'' 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 's-Graveland' AND klanten_id='4762'' at line 3