[Oracle] case when例子

-- 每个月入职人数统计 CASE WHEN 条件1 THEN 结果1 WHEN 条件2 THEN 结果2 ELSE 结果N END AS ALIAS -- 方法一 SELECT CASE WHEN TO_CHAR(HIREDATE, 'MM') = '01' THEN 1 END AS "1月" ,

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