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SQL subqueries on employee Database: List the name of the employees for their manager JONAS and also the name of the manager of JONAS

SQL subqueries on employee Database: Exercise-49 with Solution

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49. From the following table, write a SQL query to list the name of the employees for their manager JONAS and the name of the manager of JONAS.

Sample table: employees


Sample Solution:

SELECT w.emp_name,
       m.emp_name,

  (SELECT emp_name
   FROM employees
   WHERE m.manager_id = emp_id) "his MANAGER"
FROM employees w,
     employees m
WHERE w.manager_id = m.emp_id
  AND m.emp_name = 'JONAS';

OR

SELECT e.emp_name ,
       w.emp_name as "manager for employees" ,
       m.emp_name as "manager for JONAS"
FROM employees e,
     employees w,
     employees m
WHERE e.manager_id = w.emp_id
  AND w.emp_name = 'JONAS'
  AND w.manager_id = m.emp_id;

Sample Output:

 emp_name | Manager for employees | manager for JONAS
----------+-----------------------+---------------------
 FRANK    | JONAS                 | KAYLING
 SCARLET  | JONAS                 | KAYLING
(2 rows)

Practice Online


Structure of employee Database:

employee database structure

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Previous: From the following table, write a SQL query to find those employees who work as managers. Return complete information about the employees. Use co-related subquery.
Next: From the following table, write a SQL query to find those employees who receive minimum salary for a designation. Sort the result-set in ascending order by salary. Return complete information about the employees.

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SQL: Tips of the Day

SQL Server SELECT into existing table. 

INSERT INTO dbo.TABLETWO
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:

INSERT INTO dbo.TABLETWO
  (col1, col2)
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

Database: SQL Server

Ref: https://bit.ly/3y6tpA3