Help us understand the problem. What is going on with this article?

同テーブルのサブクエリで値をUPDATEする

More than 5 years have passed since last update.

同テーブルのとあるカラムの最大+1の値で違うレコードを更新

エラー

UPDATE hoge_tbl SET val1 = (SELECT MAX(val1)+1 FROM hoge_tbl) WHERE val2 = 10;

エラー無し

UPDATE hoge_tbl, (SELECT MAX(val1)+1 AS MAX FROM hoge_tbl) A set val1 = A.MAX WHERE val2 = 10;
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