oracle查询返回每行4个重复项

Question

我正在运行一个Oracle查询。它似乎可以工作，除了它返回每个结果的4个副本。下面是查询：

Select * from (
    Select a.*, rownum rnum From (
        SELECT NEW_USER.*, NEW_EHS_QUIZ_COMPLETE.datetime
        FROM NEW_USER, NEW_EHS_QUIZ_COMPLETE
        WHERE EXISTS (
            select *
            from NEW_EHS_QUIZ_COMPLETE
            where NEW_USER.id=NEW_EHS_QUIZ_COMPLETE.USER_ID
        )
        ORDER by last_name ASC
    ) a
    where rownum <= #pgtop#
)
where rnum >= #pgbot#

有人知道为什么它不能正常工作吗？

Answer 1

这里有一个交叉连接：

SELECT
    NEW_USER.*,
    NEW_EHS_QUIZ_COMPLETE.datetime
FROM NEW_USER, NEW_EHS_QUIZ_COMPLETE
WHERE EXISTS(
    select * from NEW_EHS_QUIZ_COMPLETE
    where NEW_USER.id=NEW_EHS_QUIZ_COMPLETE.USER_ID
) 

你的意思可能是：

SELECT
    NEW_USER.*,
    NEW_EHS_QUIZ_COMPLETE.datetime
FROM NEW_USER
INNER JOIN NEW_EHS_QUIZ_COMPLETE
ON NEW_USER.id = NEW_EHS_QUIZ_COMPLETE.USER_ID