Question

I do not want to use cursors for performance reasons.
Input Parameters for stored procedure: arg1, arg2,arg3 & arg4
For example:
Table A > A1 Column and A2 Column,
Table B > B1 Column (A.A1 <=>B.B1) foreign n primary key relation and B2 Column.

I want to update A.A2 value based on the following if condition,

if(arg1 == B.B2 && arg2 == B.B2)
{
   Update A set A.A2 = 1 where A.A1 = arg4
}
else{ 
if(arg1 == 1 && arg3 == B.B2){
 Update A set A.A2 = 0 where A.A1 = arg4
}

}

this is simple for one record but the Table A has 1000’s records that match A.A1 = arg4 so i have to apply the above logic or case for all records and want to avoid using cursors…how do i do it?

Answer 1

Try the below query.

 UPDATE tmp
 SET tmp.A2 =
    (CASE WHEN (tmp1.B2 == arg1 && tmp1.B2 == arg2) THEN 1 WHEN (arg1 == 1 && tmp1.B2 == arg3) THEN 0 ELSE tmp.A2)
 FROM
     A tmp
 INNER JOIN
     B tmp1
        ON tmp.A1 = tmp1.B1
 WHERE
      tmp.A1 = arg4

Hope this Helps!!