SQL having instance tutorial

Source: Internet
Author: User

SQL having instance tutorial

Having
In the listen to have added to SQL, because where the keyword cannot use aggregate functions.

SQL with syntax

SELECT column_name, Aggregate_function (column_name) from
table_name
WHERE column_name operator Value
GROUP by column_name has
aggregate_function (column_name) operator value
Let's look at  an example of having one.
 
   
   
_id OrderDate Orderprice Customer
1 2008/11/12 1000 Hansen
2 2008/10/23 1600 Nilsen
3 2008/09/02 700 Hansen
4 2008/09/03 300 Hansen
5 2008/08/30 2000 Jensen
6 2008/10/04 100 Nilsen
  
  

Now we are looking to see if there is any order for the total amount of the customer is less than 2000.

We use the following SQL statement:

SELECT Customer,sum (Orderprice) from the Orders GROUP by the
Customer having
SUM (orderprice) <2000
 
     
     
Customer SUM (Orderprice)
Nilsen 1700
 
     
     

Now we are looking for customers if "Hansen" or "Jason" has an orderly total of more than 1500.

We add a WHERE clause normal SQL statement:

 

 SELECT customer,sum (orderprice) from Orders WHERE customer= ' Han

  Sen ' OR customer= ' Jensen ' GROUP by Customer has SUM (orderprice) >1500 
   
 results are. 
 
       
       
customer sum (orderprice)
Hansen 2000
Jensen

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