SQL: Find the last name of all employees, without duplicates

SQL Basic Select Statement: Exercise-31 with Solution.

From the following table, write a SQL query to find the unique last name of all employees. Return emp_lname.

Sample table: emp_details

Sample Solution:

SELECT DISTINCT emp_lname
FROM emp_details;

Output of the Query:

emp_lname
Saule
Robbin
Sitaraman
Mardy
Foster
Emily
Manuel
Dosio
Gabriel
Snappy
Snares
Dosni

Relational Algebra Expression:

Relational Algebra Tree:

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Query Visualization:

Duration:

Rows:

Cost:

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Next: From the following table, write a SQL query to find the details of employees whose last name is 'Snares'. Return emp_idno, emp_fname, emp_lname, and emp_dept.