SQL exercises on employee Database: Display the unique department with jobs

Last update on May 30 2022 07:27:20 (UTC/GMT +8 hours)

SQL employee Database: Exercise-10 with Solution

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10. From the following table, write a SQL query to find the unique department with jobs. Return department ID, Job name.

Sample table: employees

Pictorial Presentation:

SQL exercises on employee Database: Display the unique department with jobs

Sample Solution:

SELECT DISTINCT dep_id,
                job_name
FROM employees ;

Sample Output:

 dep_id | job_name
--------+-----------
   3001 | MANAGER
   2001 | ANALYST
   3001 | SALESMAN
   1001 | MANAGER
   1001 | PRESIDENT
   2001 | MANAGER
   2001 | CLERK
   1001 | CLERK
   3001 | CLERK
(9 rows)

Relational Algebra Expression:

Relational Algebra Tree:

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Sample Database: employee

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Previous: From the following table, write a SQL query to find the employee ID, salary, and commission of all the employees.
Next: From the following table, write a SQL query to find those employees who do not belong to the department 2001. 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