Question

I have two tables l & C which are linked by two fields l.mID and c.mID the c table holds three types of records cs, ls, & vs with my query I need to select all records from l and as part of the query have three columns showing totals for cs, ls & vs;

SO far I am using an outer join:

SELECT l.*, COUNT(*) FROM l LEFT OUTER JOIN c ON c.mID = l.mID WHERE l.mID = 2

But this just appends one column with a full total any help would be great thanks.

Answer 1

You can use a CASE statement in your count:

select
  l.*
  ,COUNT(CASE WHEN c.type = 'cs' then 1 END) as cscount
  ,COUNT(CASE WHEN c.type = 'ls' then 1 END) as lscount
  ,COUNT(CASE WHEN c.type = 'vs' then 1 END) as vscount
from l
left outer join c on c.mID = l.mID
where l.mID = 2