SQL Having Clause - The Coding Shala

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SQL Having Clause

The 'Having' clause was added to SQL because 'Where' Keyword could not be used with aggregate functions. The 'Having' clause is used to place conditions on the groups created by the 'Group by' Clause.
SQL Having Clause - The Coding Shala

SQL Having Clause Syntax

The basic syntax of SQL Having Clause is as follows - 

 SELECT column_name(s)  
 FROM table_name  
 WHERE condition  
 GROUP BY column_name(s)  
 HAVING condition  
 ORDER BY column_name(s);

SQL Having Clause Examples 

The following 'emp' Table is used for the examples - 

Id     Name     Age     Address     Salary  
 1     Akshay     22     Pune       40000  
 2     Mohit      21     Delhi      42000  
 3     Akash      21     Delhi      45000  
 4     Nikhil     24     Mumbai     50000  
 5     Smith      24     Pune       50000  
 6     Akshay     22     Pune       50000  
 7     Nikhil     24     Mumbai     43000

The following query makes the group based on age - 

SQL >> select * from emp  
        group by Age;  

 Output >>  
  Id     Name     Age     Address     Salary  
 3     Akash      21      Delhi       45000  
 6     Akshay     22      Pune        50000  
 7     Nikhil     24      Mumbai      43000

Now using 'Having' Clause we can fetch only those group that have count(age) >2 - 

SQL >> select * from emp  
        group by Age  
        having count(Age)>2;  
 
Output >>  
 Id     Name     Age     Address     Salary  
 7     Nikhil     24     Mumbai     43000

The following query will only those groups that have Id > 4 - 

SQL >> select * from emp  
        group by Age  
        having Id > 4  
 
Output >>  
 Id     Name     Age     Address     Salary  
 6     Akshay     22     Pune       50000  
 7     Nikhil     24     Mumbai     43000


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