DB pivot unpivot

縦持ちのTablehtml 横持ちのTablepost   ◆縦→横 SELECT uid,        max(CASE WHEN key = 'c1' THEN value END) AS c1,        max(CASE WHEN key = 'c2' THEN value END) AS c2,        max(CASE WHEN key = 'c3' THEN value

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