IN子句

Question

在Oracle中评估多个范围我有一个Oracle选择，看起来像这样：

SELECT * 
    FROM CUSTOMER 
WHERE (CUSTOMER_TYPE BETWEEN 100 AND 200 
    OR CUSTOMER_TYPE = 350 
    OR CUSTOMER_TYPE BETWEEN 410 AND 520); 

我想改变它的东西，它结合了相同的语句中的多个范围和个人价值的评价。下面的语法是不正确的，但有一些Oracle等价物吗？

SELECT * 
    FROM CUSTOMER 
WHERE CUSTOMER_TYPE IN (100..200, 350, 410..520); 

Answer 1

考虑这是一种可能性。

SELECT * 
FROM CUSTOMER c, 
(
    select level + 99 n from dual connect by level < 102 
     union all 
    select 350 n from dual 
     union all 
    select level + 409 n from dual connect by level < 112 
) t 
WHERE c.CUSTOMER_TYPE = t.n 

它避免了OR和IN。如果你幸运的话，散列连接就是结果。