Question

Job
--------
Id
Description


JobStatus
----------
Id
JobId
StatusTypeId
Date

How do I get the current JobStatus for all jobs?

so something like….

SELECT * FROM Job j
INNER JOIN ( /* Select rows with MAX(Date) grouped by JobId */ ) s
    ON j.Id = s.JobId

(I’m sure there are a bunch of similar questions already but I couldn’t find anything which exactly does what I need).

Answer 1

In SQL Server 2005+:

SELECT  *
FROM    job j
OUTER APPLY
        (
        SELECT  TOP 1 *
        FROM    jobstatus js
        WHERE   js.jobid = j.jobid
        ORDER BY
                js.date DESC
        ) js

In SQL Server 2000:

SELECT  *
FROM    job j
LEFT JOIN
        jobstatus js
ON      js.id =
        (
        SELECT  TOP 1 id
        FROM    jobstatus jsi
        WHERE   jsi.jobid = j.jobid
        ORDER BY
                jsi.date DESC
        )

These queries handle possible duplicates on Date correctly.