Question

I have a table Request and Table Search. The Request table has an ID column, which is a foreign key in Search as RequestID. There can be multiple rows in Search with the same RequestID. There’s another column in Search, Status, which can be either Complete or Incomplete. What I want is a query that returns for each RequestID:

RequestID – Count of Search rows with 'Complete' – Count of Search rows with 'Incomplete'

Is this something that can be done easily with SQL?

Answer 1

Try :

SELECT RequestId,
SUM(CASE WHEN Status = 'Complete' THEN 1 ELSE 0 END),
SUM(CASE WHEN Status = 'Incomplete' THEN 1 ELSE 0 END)
FROM Search
GROUP BY RequestId

If you want to list every RequestId even if there was no search done on this request, you can do :

SELECT r.Id,
SUM(CASE WHEN s.Status = 'Complete' THEN 1 ELSE 0 END),
SUM(CASE WHEN s.Status = 'Incomplete' THEN 1 ELSE 0 END)
FROM Request r
LEFT JOIN Search s ON r.Id = s.RequestId
GROUP BY r.Id

See SQLFiddle