SQL Server-查找唯一记录

Question

I am trying and failing to write a script to return any unique combinations of job and suffix where the (oper = 20 and value = 0) and (oper > 20 and value = 1). Based on the data below there is only one instance, job 2 suffix 3. In this combination of job and suffix the oper 20 = 0 and the oper 40 = 1.

job suffix oper value

1    1       20    0

1    1       30    0

2    3       20    0

2    3       40    1

3    2       20    0

3    3       50    1

Any help would be appreciated

Answer 1

SELECT job
     , suffix
FROM t1
GROUP BY job
       , suffix
HAVING COUNT(CASE WHEN (oper = 20 and value = 0) OR (oper > 20 and value = 1) THEN suffix END) =  COUNT(*) 
   AND COUNT(*) = 2

Example

Answer 2

One way to approach this is as a "set-within-sets" subquery. A flexible approach to solving these is using group by and having . In your case:

select t.job, t.suffix
from table t
group by t.job, t.suffix
having sum(case when oper = 20 and value = 0 then 1 else 0 end) > 0 and
       sum(case when oper > 20 and value = 1 then 1 else 0 end) > 0;

Each condition in the having clause counts the number of rows that match a specific condition. So, the first ensure that there is at least one row where oper = 20 and value = 0 .