Name for the emploee from emp table which does not belongs to any departmanet

Question

1.00/5 (1 vote)

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Emp_table

empid name
------ ------
1 ramesh
2 ganesh
3 suresh
4 mahesh
5 pranay

dep_table

Dep_table                     
 depid         subname       empid
 -------       ------        -------------
 101          cs               4
 102          ec               1
 103          eee              5
 104          mech             2
 105          civil            4

OUTPUT
------
name
nagesh

What I have tried:

i treid using joins by aggregate functions but not got it can anyone please help in this....

Posted 1-Aug-18 7:27am

Member 13932549

Updated 3-Aug-18 9:04am

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Comments

Naga Sindhura 3-Aug-18 4:57am

output nagesh is not there in the Emp_table then how you are expecting nagesh in the result(output). Could you please update the problem statement correctly.

2 solutions

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User 11060979 · Answer 1 · 2018-08-01T07:38:00

Solution 1

If I get all right, this should do the Job

SELECT 
  Emp_table.empid,
  Emp_table.name
FROM Emp_table
LEFT JOIN dep_table ON dep_table.empid = Emp_table.empid
WHERE dep_table.depid IS NULL

It will list all employers not have a record in Dep_table

Posted 1-Aug-18 7:38am

User 11060979

Updated 1-Aug-18 7:40am

v2

Richard Deeming · Answer 2 · 2018-08-03T09:04:00

Depending on the tables, a NOT EXISTS query might be more efficient than a LEFT JOIN query. It's also clearer what the query is doing.

SQL

SELECT
    name
FROM
    emp_table
WHERE
    Not Exists
    (
        SELECT 1
        FROM dep_table
        WHERE dep_table.empid = emp_table.empid
    )
;