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POSQL SERVER - Tricky Select Statement
 

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    <p>Trying to rack my brain for a while, lots of Googling, but to no avail. I have a data set that has the following fields I need to query: <code>DEPT,NUM,TERM,ITLE</code>. I have the following possible rows.</p> <pre><code>DEPT--NUM---TERM------TITLE OSS - 1550 - 200830 - COURSE NAME (CI) OSS - 1550 - 200930 - COURSE NAME (CI) OSS - 1550 - 201230 - COURSE NAME ENG - 1600 - 200930 - OTHER COURSE (CI) OSS - 1600 - 200830 - ANOTHER COURSE (CI) USS - 2500 - 201240 - COURSE (CI) PSY - 1600 - 200830 - COURSE TITLE </code></pre> <p>What I need to do is query a table with data such as this and then pull the <code>DEPT/NUM</code> (OSS 1550) where the title matches a query ONLY IF it's the latest title. </p> <p>So if I do a search for (CI) I want 3 results using the set above (ENG 1600, OSS 1600, ISS 2500), because 201230 is the latest entry for OSS 1550 I don't want that one, but I do want the others. Right now I cannot for the life of me figure out how to write a query that will do that.</p> <p>Any help would be appreciated. Let me know if I am not clear enough.</p> <p>EDIT</p> <p>I am only getting a single record, here is what I am using based on what you have said SELECT data.* FROM ( SELECT SCBCRSE_SUBJ_CODE || ' ' || SCBCRSE_CRSE_NUMB AS crs_combo, SCBCRSE_TITLE as title, row_number() over (ORDER BY SCBCRSE_EFF_TERM DESC, SCBCRSE_CRSE_NUMB DESC) as term FROM SCBCRSE WHERE (SCBCRSE_TITLE LIKE '%' || :srch || '%') ) data WHERE data.term = 1</p> <p>My formatting is now working... no idea why I have four spaces.</p> <p>EDIT AGAIN I guess I didn't provide enough sample data... see edited table above. I need the three records with unique DEPT/NUM and the CI in the title, but not the one with older titles and CI. Make sense.</p> <p>Sorry for not being clear.</p> <p>ANSWER... here is the winner.</p> <pre><code>SELECT data.* FROM ( SELECT SCBCRSE_SUBJ_CODE || ' ' || SCBCRSE_CRSE_NUMB AS crs_combo, SCBCRSE_TITLE as title, row_number() over (partition by SCBCRSE_SUBJ_CODE,SCBCRSE_CRSE_NUMB ORDER BY SCBCRSE_EFF_TERM DESC) as seqnum FROM SCBCRSE ) data WHERE seqnum = 1 AND title LIKE '%' || :srch || '%' </code></pre> <p>Thanks for your help everyone. I wasted hours on this and you answered it in minuets.</p>
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    1. COdo you have a primary key to this table? please give a more informative context, so that you can have a more specific answer
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    2. COIt sounds like you want the latest course that matches the title. I could also imagine that you want all courses that match the title, but only those where the "term" is the latest for the course. Please clarify!
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      1. USGordon Linoff
    3. CONo PKs sadly enough.
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