HAVING clause (Microsoft Access SQL)
Applies to: Access 2013 | Access 2016
Specifies which grouped records are displayed in a SELECT statement with a GROUP BY clause. After GROUP BY combines records, HAVING displays any records grouped by the GROUP BY clause that satisfy the conditions of the HAVING clause.
SELECT fieldlist FROM table WHERE selectcriteria GROUP BY groupfieldlist [HAVING groupcriteria ]
A SELECT statement containing a HAVING clause has these parts:
|fieldlist||The name of the field or fields to be retrieved along with any field-name aliases, SQL aggregate functions, selection predicates (ALL, DISTINCT, DISTINCTROW, or TOP), or other SELECT statement options.|
|table||The name of the table from which records are retrieved. For more information, see the FROM clause.|
|selectcriteria||Selection criteria. If the statement includes a WHERE clause, the Microsoft Access database engine groups values after applying the WHERE conditions to the records.|
|groupfieldlist||The names of up to 10 fields used to group records. The order of the field names in groupfieldlist determines the grouping levels from the highest to the lowest level of grouping.|
|groupcriteria||An expression that determines which grouped records to display.|
HAVING is optional.
HAVING is similar to WHERE, which determines which records are selected. After records are grouped with GROUP BY, HAVING determines which records are displayed:
SELECT CategoryID, Sum(UnitsInStock) FROM Products GROUP BY CategoryID HAVING Sum(UnitsInStock) > 100 And Like "BOS*";
A HAVING clause can contain up to 40 expressions linked by logical operators, such as And and Or.
This example selects the job titles assigned to more than one employee in the Washington region. It calls the EnumFields procedure, which you can find in the SELECT statement example.
Sub HavingX() Dim dbs As Database, rst As Recordset ' Modify this line to include the path to Northwind ' on your computer. Set dbs = OpenDatabase("Northwind.mdb") ' Select the job titles assigned to more than one ' employee in the Washington region. Set rst = dbs.OpenRecordset("SELECT Title, " _ & "Count(Title) as Total FROM Employees " _ & "WHERE Region = 'WA' " _ & "GROUP BY Title HAVING Count(Title) > 1;") ' Populate the Recordset. rst.MoveLast ' Call EnumFields to print recordset contents. EnumFields rst, 25 dbs.Close End Sub
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