When GROUP BY is not used, there is an implicit single, aggregated group. HAVING is typically used with a GROUP BY clause.

HAVING can be used only with the SELECT statement.

Specifies a search condition for a group or an aggregate.

The 'where' clause is applied to the set of data before any grouping and the 'having' clause is applied after the grouping. The 'where' clause in a select statement is probably know by every developer. In SQL language you create a set of data by selecting the fields and applying filter criteria. HAVING actually pointed to a particular search condition for a group or an aggregate. SQL Having group by: Only those groups which are up to the mark of the HAVING criteria are actually returned.

SQL Having vs Where: HAVING also refers to the group records which are summarized while the WHERE refers to the individual records.

The only difference is that the WHERE clause cannot be used with aggregate functions, whereas the HAVING clause can use aggregate functions. It is like the WHERE clause of the GROUP BY clause. In other words, the groups for which the condition evaluates to FALSE or UNKNOWN are filtered out.SQL Having Example - Dofactory SQL Editor Tables and Columns Customer Order OrderItem Product Supplier - Id (int) - CompanyName (nvarchar) - ContactName (nvarchar) - ContactTitle (nvarchar) - City (nvarchar) - Country (nvarchar) - Phone (nvarchar) - Fax (nvarchar) Task: List all countries with more than 2 suppliers.In SQL Server, the HAVING clause includes one or more conditions that should be TRUE for groups of records. Only groups that make the conditions evaluate to TRUE are included in the result. Code language: SQL (Structured Query Language) (sql) In this syntax, the GROUP BY clause summarizes the rows into groups and the HAVING clause applies one or more conditions to these groups.

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