SELECT

DISTINCT(last_name)

FROM client as c

LEFT OUTER JOIN

(SELECT customer_id

FROM invoice

WHERE EXTRACT(YEAR FROM CAST(invoice_date AS timestamp))=2013

AND EXTRACT(MONTH FROM CAST(invoice_date AS timestamp))<>1

AND customer_id IN

(SELECT

customer_id

FROM invoice

WHERE EXTRACT(YEAR FROM CAST(invoice_date AS timestamp))=2013

AND EXTRACT(MONTH FROM CAST(invoice_date AS timestamp))=1

GROUP  BY customer_id

HAVING COUNT(invoice_id)<>0)

GROUP  BY customer_id

HAVING COUNT(invoice_id)<>0) AS i_i ON i_i.customer_id=c.customer_id

WHERE c.customer_id IS NOT NULL;