Hello @ll,

I have a small question.

Table A

NrWorker ineger

Name

Active 0 or 1

…

Table B

NrWorker integer

Year

Month

ValueWorkerMonth

Now I would like to get all NrWorker from Table A with Active 1 and the ValueWorkerMonth from the Table B (from the current month)

This is like

Select a.nrworker, b.valueworkermonth from table A left join table B on a.nrworker = b.nrworker where a.active = 1 and b.year = 2017 and b.month = 4

Fine, but I would like also all Worker (NrWorker from Table A) where are not present in Table B in this month.

Table A

NrWorker 12

NrWorker 13

NrWorker 14

Table B

NrWorker 12

Year  2017

Month 4

I would like to get not only Worker 12,  rather 13 and 14 too.

How can I realize it in Firebird?

Thank you