1

我正在尝试使用以下格式执行SUM()具有三个类似条件的操作：if()

第一：

if((TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) > high OR TIME IS NULL) AND TIME3 != '0000-00-00 00:00:00' AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i')

第二个：

if(TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) > value AND TIME3 != '0000-00-00 00:00:00' AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i')

第三个：

if(TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) >0 AND TIME3 != '0000-00-00 00:00:00' AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i')

存在high和value来自几个表的两个不同字段列。

不幸的是，我似乎无法完成这项工作，很可能是因为这句话不能SUM()放在一起。

如何才能做到这一点？

编辑：添加了整个查询：

SELECT VALUE1 ,
 COUNT( * ) TOTAL 
 from ( 
  SELECT (
   if((TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) > high OR TIME IS NULL) AND TIME3 != '0000-00-00 00:00:00' AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i')) + 
   if(TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) > value AND TIME3 != '0000-00-00 00:00:00' AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i')) + 
   if(TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) >0 AND TIME3 != '0000-00-00 00:00:00' AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i'))) as 'ok',
if((TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) > high OR TIME IS NULL) AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i'),4, 
if(TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) > value AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i'),3, 
if(TIME_TO_SEC(TIMEDIFF(IF(TIME = '0000-00-00 00:00:00',sysdate() , TIME ), TIME2)) >0 AND DATE_FORMAT(TIME2, '%Y-%m-%d %H:%i') < DATE_FORMAT(now(), '%Y-%m-%d %H:%i'),2, 
if(TIME >'0000-00-00 00:00:00', 1,0) ))) VALUE1 
FROM table1 , table2 left outer join table3 on( value2 = value3 ) where id_param='col1' and col2 = DATE_FORMAT(if(CURTIME()>='00:00:00' and CURTIME() < '08:00:00',sysdate() - INTERVAL 1 DAY, sysdate()), '%Y-%m-%d') ) as datos GROUP BY VALUE1

这应该返回一个 2columnx3rows 表，其值为“ok”、“4”、“3”和“2”。

4

1 回答 1

1

你可以做

SELECT (if_cond1 + if_cond2 + if_cond3) as `x` FROM...

（根据上面的 IF扩展if_cond1, 2） 。3

如果你想简化 SQL 扩展后的样子（非常大），你可以使用这样的子查询。

于 2012-09-11T08:23:06.653 回答