Sqlhaving usage and example tutorial

The usage of sqlhaving is optional in conjunction with the HAVING clause in the instance tutorial. It is similar to the Where clause. However, after determining which records are restricted by the clause, it will show that they have been grouped. It is usually at the end of an SQL statement. The SQL statement of a HAVING clause may not include the groupby clause. The syntax is as follows: SELECTcolumn1,... column_n, aggregate_f SQL having usage and example tutorial

The HAVING clause is optional and can be used together with the group by clause. It is similar to the Where clause. However, after determining which records are restricted by the clause, it will show that they have been grouped. It is usually at the end of an SQL statement. The SQL statement of a HAVING clause may not include the group by clause.

Syntax:

SELECT column1,... column_n, aggregate_function (expression)
FROM table_name
[WHERE condition]
[Group by column1,... column_n]
HAVING condition
Instance:

Select Item, Sum (Price) as TotalSum
From Antiques
Group by Item
Having Sum (Price)> 57

The query returns different items and the so-called 'field list totalsum' counts the sum of antique results to supply each item. The HAVING clause will only return the amount of more than 57 USD and the results of the project.

Example #2

Select SellerID, Count (*) as Number_of_Sellers
From Antiques
Where BuyerID = 21
Group by SellerID
Having Count (*)> 1

The example shows the seller's ID list and their quantity, but only when more than one BuyerID is equal to 15 sellers.

Example #3

SELECT Item, COUNT (Item) AS Total, MAX (Price) AS MaxPrice
FROM Antiques
Group by Item
Having count (Item)> 1 and max (Price) <500