I've the next query, that we made to compile data from numerous sights according to client data.
SELECT vw_clients.client_id, name, exts, vms, ivrs, queues, conf10, conf20, conf30 FROM vw_clients, vw_exts, vw_vms, vw_ivrs, vw_queues, vw_conf10, vw_conf20, vw_conf30 WHERE vw_clients.client_id = vw_exts.client_id AND vw_clients.client_id = vw_vms.client_id AND vw_clients.client_id = vw_ivrs.client_id AND vw_clients.client_id = vw_queues.client_id AND vw_clients.client_id = vw_conf10.client_id AND vw_clients.client_id = vw_conf20.client_id AND vw_clients.client_id = vw_conf30.client_id;
The query works fine as long as you will find records in each and every view relevant towards the records in volkswagen_clients. However I have to modify this to utilize a left join, to ensure that it returns all records from vm_clients and just individuals in the other sights which have records for individuals clients.
I have find out about left joins, but for the most part I've only found information on joining one or possibly two tables - but I have to join 8. Will I perform a left join on volkswagen_clients.client_id towards the corresponding client_id area in most from the sights? What is the syntax for your?
Would be thankful for any help. I am not far from fixing this problem and i believe this is actually the last bit of the puzzle!
You should use left join by putting volkswagen_clients within the first within the from list, then other tables adopted after left join. The left join can join only two tables a treadmill "result set" along with a table,in which the result set is caused by the previous join.
Inside your situation:
SELECT T0.client_id, name, exts, vms, ivrs, queues, conf10, conf20, conf30 FROM vw_clients T0 left join vw_exts T1 on T0.client_Id=T1.client_id Left join vw_vms T2 on ... ... Where ...
Maybe here you do not need where clause.
Yes, you’d just replace your
WHERE having a
LEFT JOIN vw_exts ON vw_clients.client_id = vw_exts.client_id
You'll be able to remove individuals extra tables in the