Question

I have one requirement to show data in using SQL query only.
Table name: EMP_DEPT

    DEPARTMENT  |   EMPLOYEE    |   SALARY
    DEPT1       |   ABC         |   20000
    DEPT1       |   MNO         |   30000
    DEPT1       |   XYZ         |   25000
    DEPT2       |   DEF         |   42000
    DEPT2       |   GHI         |   35000
    DEPT3       |   JKL         |   36000

and what I am expecting result in following way

    DEPARTMENT  |   EMPLOYEE    |   SALARY
    DEPT1       |   ABC         |   20000
                |   MNO         |   30000
                |   XYZ         |   25000
    DEPT2       |   DEF         |   42000
                |   GHI         |   35000
    DEPT3       |   JKL         |   36000

What will be the select query to print like this. Using MSSQL as DB

Thanks in advance.

Answer 1

You can use ROW_NUMBER() to identify the first time a department appears, and use a CASE statement to show the department name or blank.

SELECT
    CASE
        WHEN ROW_NUMBER() OVER(PARTITION BY DEPARTMENT ORDER BY EMPLOYEE) = 1
        THEN DEPARTMENT
        ELSE ''
    END AS DEPARTMENT,
    EMPLOYEE,
    SALARY
FROM EMP_DEPT
ORDER BY EMP_DEPT.DEPARTMENT, EMPLOYEE