Question

我有一个Oracle选择，如下所示：

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

我想将其更改为在同一语句中结合多个范围和单个值的评估的内容。以下语法是不正确的，但有一些Oracle等价吗？

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

Answer 1

将此视为一种可能性。

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 。如果幸运的话，结果就是哈希联接。

评估Oracle IN子句中的多个范围

1 个答案: