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POT-SQL Combine Multiple Rows Into Single Row
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  1. POT-SQL Combine Multiple Rows Into Single Row
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    copied!<p>I have this T-SQL (simplified):</p> <pre><code>select 3.00 as score1, null as score2, null as score3, null as score4 union all select null as score1, 4.5 as score2, 1.5 as score3, null as score4 </code></pre> <p>Which produces this:</p> <pre><code>score1 score2 score3 score4 ------------------------------ 3.00 NULL NULL NULL NULL 4.5 1.5 NULL </code></pre> <p>But i want to join it into one row, like this:</p> <pre><code>score1 score2 score3 score4 ------------------------------ 3.00 4.5 1.5 NULL </code></pre> <p>Sorry - im drawing blank (it's late in the day). </p> <p>Do i need a temporary table?</p> <p>The reason i'm doing this is that i have the following association:</p> <p><strong>Reviews 1..* Scores</strong></p> <p>So a regular join produces 1 row for each Score - but i want to insert a record (into another table), that has a column for each record - if you know what i mean:</p> <pre><code>INSERT INTO OtherTable (ReviewId, Score1, Score2, Score3, Score4) ???? </code></pre> <p>Hope that makes sense.</p> <p><strong>EDIT</strong></p> <p>Based on @OMG Ponies answer (which he just removed), i came up with this:</p> <pre><code>SELECT CASE MAX(x.score1) WHEN 0 THEN NULL ELSE MAX(x.score1) END AS score4 CASE MAX(x.score2) WHEN 0 THEN NULL ELSE MAX(x.score2) END AS score4 CASE MAX(x.score3) WHEN 0 THEN NULL ELSE MAX(x.score3) END AS score4 CASE MAX(x.score4) WHEN 0 THEN NULL ELSE MAX(x.score4) END AS score4 FROM (select 3.00 as score1, 0 as score2, 0 as score3, 0 as score4 union all select 0 as score1, 4.5 as score2, 1.5 as score3, 0 as score4) x </code></pre> <p>But it's pretty ugly. Any other ideas? </p>
 

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