Question

Need to write an SQL Query

To get any 2 EmpCode for every EmpGroup for city = del

• EmpCode is unique
• 1 EmpCode can have only 1 EmpGroup
• 1 EmpGroup can have multiple EmpCodes

Table: EMP_CITY

EmpCode  EmpGroup   City
1         A          del
2         A          del
3         B          del
4         B          del
5         C          del
6         C          del
7         A          ban
8         A          del

Output

EmpGroup: A
    1
    2
EmpGroup: B
    3
    4
EmpGroup: C
    5
    6

Answer 1

Try this query

SET @level = 0;
SET @group = '';

SELECT 
EmpCode,EGroup
FROM (
    SELECT 
        City,
        EmpCode,
        EmpGroup,
        @level := IF(@group = EmpGroup, @level+1, 1) AS level, 
        @group := EmpGroup as EGroup 
    FROM test
    ORDER BY EmpGroup 
) rs
WHERE level < 3 

Out put

EMPCODE     EGROUP
1           A
2           A
3           B
4           B
5           C
6           C

Here is sqlfiddle Demo