语法：CASE [COLUMN_] WHEN [situation] THEN .... END AS [NEW_NAME] 语法：CASE [COLUMN_] WHEN [situation]
阅读背景：
MySQL查询语句处理结果-枚举字段
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语法：CASE [COLUMN_] WHEN [situation] THEN .... END AS [NEW_NAME] 语法：CASE [COLUMN_] WHEN [situation]
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