SQL从CASE语句返回多个值

Question

如何重写此SQL语句以执行我所需的操作？

SELECT * FROM TABLE 
    WHERE COLUMN_NAME_1 IN (CASE 
     WHEN COLUMN_NAME_2 = 'X' THEN 'A' 
     WHEN COLUMN_NAME_2 = 'Y' THEN 'B', 'C' END) 

显然我不能从CASE子句中返回多个值......所以我该怎么写呢？我敢肯定，我今天慢，因为这似乎很容易....

Answer 1

SELECT * FROM Table WHERE 
    (COLUMN_NAME_2 = 'X' AND COLUMN_NAME_1 = 'A') OR 
    (COLUMN_NAME_2 = 'Y' AND COLUMN_NAME_1 IN ('B', 'C')) 

或

SELECT * FROM Table WHERE COLUMN_NAME_2 = 'X' AND COLUMN_NAME_1 = 'A' 
UNION ALL 
SELECT * FROM Table WHERE COLUMN_NAME_2 = 'Y' AND COLUMN_NAME_1 IN ('B', 'C') 

这假设你只想在COLUMN_NAME_2 X或Y的结果。如果您需要其他行，则无法分辨您的原始SQL中哪些行。