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【Mysql】データベースのidを連番に変更する

Posted at

テストの投稿があまりにも増えすぎてIDが半端なくスカスカ、なにがなんだかわからなくなってました。。。。
現状入っているデータを連番に出来ないと思って調べると以下のコードでIDを連番に変更できた。

SET @i := 0 ;
UPDATE `column` SET id = (@i := @i +1) ;

SET @i := 0 ;
UPDATE `カラム名` SET id = (@i := @i +1) ;

注意点として、変更するテーブルがリレーションしていると、関連テーブルは変更されないと思うので要注意です。

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