bleis-tift https://blog.hatena.ne.jp/bleis-tift/ ぐるぐる～ https://bleis-tift.hatenablog.com/ SQL col1 col2 col3 col4 1001 2323 500 0 456 1001 0 200 1111 1001 0 300 こんな感じにデータが入ってて、 col1-2 sum(col3) sum(col4) 1001 500 500 な感じにcol1かcol2が1001になってるやつのcol3とcol4を集計したい場合*1、 SELECT CASE col3 WHEN 0 THEN col2 ELSE col1 END AS 'col1-2' , sum(col3) , sum(col4) FROM SomeTable WHERE 1001 IN (col1, col2) GROU… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbleis-tift.hatenablog.com%2Fentry%2F20080417%2F1208435979" title=" - ぐるぐる～" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2008-04-17 21:39:39 rich https://bleis-tift.hatenablog.com/entry/20080417/1208435979 1.0 100%