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select ma.TITLE,ma.ID as aid,ur.USER_ID
from LEO_MENU_ACTIVITY_RELATION mr
inner join LEO_MENU_MASTER mm on mm.ID=mr.MENU_ID
INNER join LEO_MENUACTIVITY ma on mr.ACTIVITY_ID=ma.ID
LEFT OUTER JOIN LEO_USER_RIGHTS ur on ma.ID=ur.MENU_RELATION_ID and ur.MENU_ID=mm.ID and ur.USER_ID='141'
where mm.ID='1'
UNION (SELECT
'List' as TITLE,
1 as ID,
case (WHEN ur.MENU_RELATION_ID=1 THEN NULL ELSE USER_ID END)as USER_ID
from
LEO_USER_RIGHTS)
在我想执行条件选择UNION一样,如果ur.MENU_RELATION_ID = 1个,则USER_ID应选择为NULL,否则原来的从“LEO_USER_RIGHTS值'表必须被检索。甲骨文:如果那么如何使用select语句
我该怎么做?请帮助
Krishnik
除了在WHEN和END之后出现的一组神秘的括号之外,CASE表达式看起来是正确的。你遇到什么问题? – 2010-12-09 07:45:31