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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Previous: From the following table, write a SQL query to find the cheapest item(s). Return pro_name and, pro_price.
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.
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What is the difficulty level of this exercise?
SQL: Tips of the Day
Nested select statement in SQL Server.
You need to alias the subquery.
SELECT name FROM (SELECT name FROM agentinformation) a
or to be more explicit
SELECT a.name FROM (SELECT name FROM agentinformation) a
Database: SQL Server
Ref: https://bit.ly/3Qruiu5
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