SQL Exercise: Employees whose last name begins with the letter D

Last update on February 10 2025 07:55:30 (UTC/GMT +8 hours)

From the following table, write a SQL query to locate the employees whose last name begins with the letter 'D'. Return emp_idno, emp_fname, emp_lname and emp_dept.

Sample table: emp_details

 EMP_IDNO EMP_FNAME       EMP_LNAME         EMP_DEPT
--------- --------------- --------------- ----------
   127323 Michale         Robbin                  57
   526689 Carlos          Snares                  63
   843795 Enric           Dosio                   57
   328717 Jhon            Snares                  63
   444527 Joseph          Dosni                   47
   659831 Zanifer         Emily                   47
   847674 Kuleswar        Sitaraman               57
   748681 Henrey          Gabriel                 47
   555935 Alex            Manuel                  57
   539569 George          Mardy                   27
   733843 Mario           Saule                   63
   631548 Alan            Snappy                  27
   839139 Maria           Foster                  57

Sample Solution:

-- This query selects all columns from the 'emp_details' table.
SELECT *
-- Specifies the table from which to retrieve the data (in this case, 'emp_details').
FROM emp_details
-- Filters the rows to only include those where the 'emp_lname' column starts with the letter 'D'.
WHERE emp_lname LIKE 'D%';

Output of the Query:

emp_idno	emp_fname	emp_lname	emp_dept
843795		Enric		Dosio		57
444527		Joseph		Dosni		47

Code Explanation:

The given query in SQL that retrieve all columns (denoted by "SELECT *") from the 'emp_details' table where the value in the "emp_lname" column starts with the letter 'D'.
In the "WHERE emp_lname LIKE 'D%'" condition, only rows where the value in the "emp_lname" column starts with 'D' are retrieved.
The "%" symbol is a wildcard that matches any number of characters after the specified pattern, in this case 'D'.

Relational Algebra Expression:

Relational Algebra Tree:

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For more Practice: Solve these Related Problems:

• Write a SQL query to find employees whose last name starts with the letter 'S'. Return emp_idno, emp_fname, emp_lname, emp_dept.
• Write a SQL query to retrieve employees whose last name ends with the letter 'n'. Return emp_idno, emp_fname, emp_lname, emp_dept.
• Write a SQL query to find employees whose last name contains the letter 'a'. Return emp_idno, emp_fname, emp_lname, emp_dept.
• Write a SQL query to list employees whose last name has exactly 5 letters. Return emp_idno, emp_fname, emp_lname, emp_dept.

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