Question

以下代码有什么问题？

SELECT  first_name, last_name
FROM    employees
UNION ALL
SELECT  first_name, last_name
FROM    dependents
ORDER BY  last_name
LIMIT 6 OFFSET 1;

即使是使用LIMIT的简单查询似乎也不起作用：

SELECT  first_name, last_name
FROM    dependents
ORDER BY  last_name
LIMIT 6 OFFSET 1;

重复出现此错误：ORA-00933：SQL命令不正确结束

Answer 1

我相信oracle不支持LIMIT。试试这个

ORDER BY last_name
OFFSET 1 ROWS FETCH NEXT 6 ROWS ONLY;

请注意Oracle 12c

支持此语法

Answer 2

代码有什么问题，Oracle不支持limit。期。最新版本支持ANSI标准fetch first <n> rows only。

也许你打算：

SELECT e.*
FROM (SELECT e.*, ROW_NUMBER() OVER (ORDER BY last_name) as seqnum
      FROM (SELECT first_name, last_name FROM employees
            UNION ALL
            SELECT first_name, last_name
            FROM dependents
           ) e
      ORDER BY last_name
     ) e
WHERE seqnum BETWEEN 1 and 7;

LIMIT不适用于UNION

2 个答案: