how to compare single value with all rows which have comma seperated values?

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HI all

i have one table where on column stores comma separated values

roleid
1,2,4,6,7
3,4,6,7,8
2,3,4,5,6
1,2,3,5,6,7

this are the role id which assigns to the user. now i want to get user by role.

if admin select role id 3 then it should return all the users which are assign to role id 3. i do not want to use cursor for this as it will affect the performance of the query. i don't have any other ideas. can some one please help me ?

Posted 5-Jun-14 3:25am

ravikhoda

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[no name] 5-Jun-14 9:41am

how about using CONTAINS ?

Vi(ky 5-Jun-14 10:23am

Is there any table that map role to user?

3 solutions

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Peter Leow · Answer 1 · 2014-06-05T03:47:00

Assuming you are looking for userids that have roleid=3, try CHARINDEX like this:

select userid from table1 where CHARINDEX('3', roleid ) > 0

However, it is bad practice to have multiple values in a single field, that is against 1NF principle. Instead, you should have a table with userid and roleid fields (both composite primary key) like this:

userid       roleid
  1             1
  1             2
  1             4
  1             6
  1             7
  2             3
  2             4
...

CPallini · Answer 2 · 2014-06-05T03:45:00

Solution 1

You can use the LIKE operator, see "SQL LIKE Operator" at w3schools.com[^].

Posted 5-Jun-14 3:45am

CPallini

Saral S Stalin · Answer 3 · 2014-06-05T22:32:00

Assuming your table structre is like below

UserId AssignedRoles
1 1,12,3,4,5,6
2 6,3,23,1,4
5 2,11,19,12,34

SQL

DECLARE @TABLE TABLE (UserId TINYINT, AssignedValues VARCHAR(500))
INSERT INTO @TABLE VALUES (1, '1,12,3,4,5,6')
,(2, '6,3,23,1,4' )
,(3, '2,11,19,12,34')

DECLARE @UserId INT = 3, @RoleId INT = 19


SELECT *
FROM @Table t
WHERE UserId = @UserId
AND @RoleId IN (SELECT Value
                FROM dbo.Split(AssignedValues, ',')
                )

Here dbo.Split is the normal split function. If you dont have it in your db it is a google search away.

how to compare single value with all rows which have comma seperated values?

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