Question

大家好我正试图找到一种方法，根据这些条件从一系列数据中选择最小值或最大值：

如果setuptime和processtime cols都为0，则选择MIN（oprNum）（操作还没有开始，所以得到第一个oprnum）
如果setuptime和process time不为0，则获取max oprnum（活动操作）。

根据其中任何一个我想要一行...请参阅附加的数据示例。谢谢！这是一个更大的查询的一部分，所以我需要每个prodid 1输出行...

+------------+--------+---------+--------------------+--------------------+
| ProdId     | OprNum | Company | SetupTime          | ProcessTime        |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 10     | 12      | 1.3400000000000000 | 1.6100000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 10     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 15     | 12      | 1.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 50     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 60     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 60     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 70     | 12      | 0.0700000000000000 | 0.0400000000000000 |
+------------+--------+---------+--------------------+--------------------+
| 12M0003381 | 70     | 12      | 0.0000000000000000 | 0.0000000000000000 |
+------------+--------+---------+--------------------+--------------------+

Answer 1

根据上次评论更新了查询

如果最大记录有0次，我想选择最后一条记录有一个设置时间或处理时间。如果我把这一行添加到你的小提琴（＆＃39; 12M0003381＆＃39;，80,12,0.00,0.00）当我想要最后一个时，我得到这一行具有设置时间或处理时间

此查询使用的

逻辑仅用于计算其他列weighted_value。在外部查询中，我们使用min over value和max over weighted value，就像之前一样。

select 
  t.prodId,
  case when MAX(t.setuptime+ t.processtime)>0 then MAX(t.weighted_value) else MIN(t._value) end as value
from (
    select 
         prodID,
         oprnum as _value,
         setuptime,
         processtime,
         case 
           when setuptime+processtime>0 
           then oprnum 
           else NULL 
           end as weighted_value from tbl
    ) t
group by t.prodID

更新了小提琴链接：http://sqlfiddle.com/#!6/b7ecb/20

请尝试此查询

select t1.ProdId, case when exists(
select 1 from tbl  t2 where t2.setuptime >0 or t2.Processtime>0 and t2.prodId=t1.prodId
)  then MAX(t1.oprNum) ELSE MIN(t1.oprNum) END
from tbl t1
group by ProdId

sql fiddle link http://sqlfiddle.com/#!6/c52e22/1

Answer 2

一种方式：

SELECT 
    ProdId, 
    CASE WHEN SUM(SetupTime) + SUM(ProcessTime) = 0 THEN MIN(oprNum) ELSE MAX(oprNum) END 
FROM T
GROUP BY ProdId

sql根据条件选择min或max

2 个答案: