In SQL what is the difference between ORDER BY clause and GROUP BY clause ?

02 February 2018 1 226 Report

In RDBMS, What does "Group by" clause do in the columns of a table ?

Dear Murari,

The ORDER BY clause's purpose is to sort the results by specific columns in acceding or descending order. On the other hand, GROUP BY is used in conjunction with aggregate functions like SUM, MAX, MIN, AVG, COUNT etc. To further assist you bellow you can find an example for both commands:

TABLE:

ID NAME

1 Peter

2 John

3 Greg

4 Peter

SELECT * FROM TABLE ORDER BY NAME

3 Greg

2 John

1 Peter

4 Peter

SELECT Count(ID), NAME FROM TABLE GROUP BY NAME

1 Greg

1 John

2 Peter

SELECT NAME FROM TABLE GROUP BY NAME HAVING Count(ID) > 1

Peter

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