Comma-separated input string for SQL Server

Question

Hello SQL Server experts. Please help me with the efficient way to apply boolean logic (And, Or) to a comma-separated input string in SQLsServer.

Example:

DECLARE @ATable TABLE(ID INT, Value varchar(50))

INSERT INTO @ATable 
VALUES (1, 'A'), (1, 'B'), (1, 'C'), (2, 'C'), (2, 'D'), (3, 'A'), (4, 'B')

declare @inputStr varchar(max)
set  @inputStr = 'A,B,C,D'

declare @andOr varchar(30)  -- can be either 'and' or 'or'

if @andOr = 'and' , I would like to get Ids that have values both A and B. In above table the result would be data with Id 1. So the result would be

ID | Values
-----------
1  | A,B,C

if @andOr = 'or' , I would like to get Ids that have values either A or B. In above table the result would be data with Id 1,3 and 4. So the result would be

ID | Values
-----------
1  | A,B,C
3  | A
4  | B

Thanks.

Answer 1

Please test following SQL Select statements

The first thing you should pay attention is the SQL string split function You can create a copy of the user defined split function on your database

I use COUNT() aggregate function with Partition By clause. This is also a great enhancement in T-SQL for programmers. I use this to check if all input parameter string pieces match with @ATable values

The last trick is string concatenation in SQL for display. I used "For XML Path" for string concatenation to fulfill your requirement

DECLARE @ATable TABLE(ID INT, Value varchar(50))
INSERT INTO @ATable VALUES (1,'A'),(1,'B'),(1,'C'),(2,'C'),(2,'D'),(3,'A'),(4,'B')

declare @inputStr varchar(max)
set  @inputStr='A,B'
declare @andOr varchar(30) 

set @andOr='and'

SELECT
  t.ID,
  STUFF(
    (
      SELECT ',' + t1.Value
      FROM @ATable t1
      WHERE t1.ID = t.ID
      FOR XML PATH(''),TYPE
      ).value('.','VARCHAR(MAX)'
    ), 1, 1, '') as [Values]
FROM (
    select 
        distinct ID
    from (
    select
        s.cnt, t.*, 
        tcount = count(t.value) over (partition by t.id)
    from (
        select *, cnt = count(*) over (partition by 1) from dbo.split(@inputStr,',') s
    ) s
    left join @ATable t on s.val = t.value
    ) r
    where tcount = cnt
) t

set @andOr='or'

SELECT
  t.ID,
  STUFF(
    (
      SELECT ',' + t1.Value
      FROM @ATable t1
      WHERE t1.ID = t.ID
      FOR XML PATH(''),TYPE
      ).value('.','VARCHAR(MAX)'
    ), 1, 1, '') as [Values]
FROM (
    select
        distinct t.ID
    from dbo.split(@inputStr,',') s
    inner join @ATable t on s.val = t.value
) t

The result is