在多行上进行AND的SQL查询

Question

I have a table (tblABC) which looks like

-----------------------------
BasicID   | Filter 1| Filter2 |
------------------------------
 100          1         2
 100          3         4
 101          8         9

I want to select the BasicID which has Filter1=1 and Filter2=4. ie I want to get the output as 100

I can't be using AND here as as it searches within the same row only. ie select * from tblABC where Filter1=1 and Filter2=4 , yields no result.

As of now the query that I use is

select * from tblABC  
where 
and BasicID in 
(
select BasicID from tblABC  
where Filter1 IN (1) 
)
and BasicID  in 
(
select BasicID from tblABC  
where Filter2 IN (4) 
)

This one works for me. But there are like 12 Filter columns and when such a string search is run in large volumes, wouldn't it make the query slow. What would be a more efficient way of doing this?

I am using Microsoft SQL 2014

Answer 1

Try below

select basicid from tblABC where filter1 = 1 intersect 
select basicid from tblABC where filter1 = 4 

Answer 2

If the two filter values can be either in different rows or the same row, the GROUP BY / HAVING method will fail (in the same row case). This method will work in all cases (the intersect query by @Azar will work, too):

select distinct a.BasicID 
from tblABC as a
  join tblABC as b
    on a.BasicID = b.BasicID
where a.Filter1 = 1 
  and b.Filter2 = 4 ;

---

If you want the GROUP BY / HAVING COUNT method, this modification will work in all cases, too:

select basicid
from   tblABC
where  filter1 = 1
   or  filter2 = 4
group by
       basicid
having count(case when filter1 = 1 then 1 end) >= 1
   and count(case when filter2 = 4 then 1 end) >= 1 ;

Answer 3

Try this:

SELECT BasicID
  FROM tblABC
  WHERE Filter1=1 OR Filter2=4
    GROUP BY BasicID
    HAVING COUNT(BasicID)=2

In case of 12 filters, change COUNT to be 12.

Answer 4

You can use group by and a count if you are sure one line doesn't match multiple rules (then the count might be off and the query breaks).

select basicid
from   tblABC
where  filter1 = 1
or     filter2 = 4
group
by     basicid
having count(*) = 2 /*number of filters*/

Answer 5

You can use the following query

SELECT DISTINCT BasicId 
FROM  tblABC  main
WHERE Filter1 = 1
    AND  EXISTS (SELECT TOP 1 Filter2
                 FROM tblABC
                 WHERE tblABC.BasicId =  main.BasicId
                   AND Filter2 = 4)

Answer 6

You have used the IN clause. You can easily create three additional variants: using exists instead of in, using intersection, and using a selfjoin of tblABC.

But as far as I know, query optimizers can translate automatically your query into these three variants and even it could get more non-trivial rewritings.

I suggest you:

• First, let the optimizer work.
• Second, if your query is finally slow then create (if not exists) a index over BasicID.
• Third, if the query is still slow then use two bitmap indexes, over filter1 and over filter2.
• And fourth if it is still slow use and indexed view.