使用SQL Server查询检查对行

Question

Sample Database:

workerid    codes   empl_rcd
123 USA 0
123 NY  0
123 SF  0
123 USA 1
123 NY  1
567 USA 1
567 CA  1
567 CA  2
567 NY  1
890 USA 0
890 NY  0
890 USA 2
890 NY  1

requirement: for each worker if USA is present check the corresponding NY is present or not

eg for worker 123 if USA 0 is present then check NY 0 is present or not if USA 1 is present then check NY 1 is present or not similar for other workerids also

Resultant output should be :

123 USA 0
123 NY  0
123 USA 1
123 NY  1
567 USA 1
567 NY  1
890 USA 0
890 NY  0

Answer 1

try this:

select * from yourtable f1
where f1.codes in ('USA', 'NY') 
and exists
(
   select * from yourtable f2
   where (f1.codes='USA' and f2.codes='NY'   or f1.codes='NY' and f2.codes='USA')
   and f1.workerid=f2.workerid and f1.empl_rcd=f2.empl_rcd
)

Answer 2

Solution 2:

with perimeter as (
select f1.*, case when f1.codes='USA' then 'NY' else 'USA' end CodesSearch
from yourtable f1
where f1.codes in ('USA', 'NY') 
)
select f1.* from perimeter f1
and exists
(
   select * from perimeter f2
   where f1.CodesSearch=f2.codes and f1.workerid=f2.workerid and f1.empl_rcd=f2.empl_rcd
)