Oracle关于IF-THEN-ELSE的其余实现

1：decode函数web select decode(sex, 'M', 'Male', 'F', 'Female', 'Unknown') from employees; 2：在where中特殊实现sql SELECT T2.*, T1.* FROM T1, T2 WHERE (T2.COMPARE_TYPE = 'A' AND T1.SOME_TYPE LIKE 'NOTHING%') OR

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