问题描述
我有一个查询,如果名为OrderBy的标志为1,则它是一个日历事件,我需要检查两个日期时间字段之间的范围.而其他所有类型仅检查您正在查看的日期.我研究了if语句,并发现有很多建议使用案例的帖子,因此我尝试将其实现到我的查询中.我的查询需要条件在哪里.我知道我有语法问题,这就是为什么我在这里,希望有人指出正确的方法.
I have a query that if a flag called OrderBy is 1 then it is a calendar event and I need to check for a range between two date time fields. Whereas all other types we just check for the day you are viewing. I research if statements and saw many posts where it was suggested a case be used so I tried to implement it into my query. My query needs the condition in the where. I know I have syntax issues and that is why I am here in the hopes that someone could point out the correct way to do this.
谢谢您的时间
我当前的查询
SELECT activities.*,
activitytypes.orderby
FROM activities
LEFT OUTER JOIN activitytypes
ON activities.typeid = activitytypes.typeid
WHERE activities.userid = 86
AND activities.typeid NOT IN ( 5,
10,
11,
12,
19 )
AND
CASE
WHEN activities.orderby = 1 THEN activities.starttime >= '2013-08-26 04:00:00'
AND activities.endtime <= '2013-08-27 04:00:00'
ELSE activities.activitydate = '2013-08-26'
order BY activitytypes.orderby,
activities.starttime
推荐答案
只要使用足够的括号,就可以使用AND
和OR
进行此操作.
You can do this with AND
and OR
as long as you use sufficient parentheses.
我还假设activities.OrderBy
可以为null.如果不是这种情况,则可以删除null检查:
Also I'm assuming that activities.OrderBy
can be null. If that's not the case you can remove the null check:
SELECT activities.*,
activitytypes.orderby
FROM activities
LEFT OUTER JOIN activitytypes
ON activities.typeid = activitytypes.typeid
WHERE activities.userid = 86
AND activities.typeid NOT IN ( 5, 10, 11, 12, 19 )
AND ( ( activities.orderby = 1
AND activities.starttime >= '2013-08-26 04:00:00'
AND activities.endtime <= '2013-08-27 04:00:00' )
OR ( ( activities.orderby IS NULL
OR activities.orderby != 1 )
AND activities.activitydate = '2013-08-26' ) )
ORDER BY activitytypes.orderby,
activities.starttime
或者,如果您仍然想使用CASE
,则只需使用END
关闭CASE
语句,如下所示:
Alternatively, if you still want to use CASE
, you just need to close your CASE
statement using END
, like this:
SELECT activities.*,
activitytypes.orderby
FROM activities
LEFT OUTER JOIN activitytypes
ON activities.typeid = activitytypes.typeid
WHERE activities.userid = 86
AND activities.typeid NOT IN ( 5,
10,
11,
12,
19 )
AND (
CASE
WHEN activities.orderby = 1 THEN activities.starttime >= '2013-08-26 04:00:00'
AND activities.endtime <= '2013-08-27 04:00:00'
ELSE activities.activitydate = '2013-08-26'
end )
ORDER BY activitytypes.orderby,
activities.starttime
这篇关于MYSQL中的条件where子句的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!