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MultiSelect Parameter Forms Access Tutorial

Access Group By Clause

Group By SQL clause is a query command used to combine data based on the value(s) in the field(s) of a table(s).  The Group By clause is most often used in combination with one or more aggregate functions.

The basic syntax of the Group By statement is:

Group By TableName.Field1, TableName.Field2

The Access group by clause comes after the where clause of a query and before the optional having clause in the query:

Select TableName.FieldName1, Count(TableName.Field2),Avg(TableName.Field3) From TableName Where your criteria Group By TableName.FieldName1 Having some criteria.

Note: The ending semicolon is a required component of all SQL statements.

Now see the Access group by clause with real column and table names:

Select M_Employees.Emp_Name, Sum(iif(Daily_Absence=true,1,0)), Avg(Daily_Hours) From M_Employees Where M_Employees.Work_Date>=#01/01/05# and M_Employees.Work_Date<=#03/31/05# Group By M_Employees.Emp_Name Having Sum(iif(Daily_Absence=true,1,0))>3;

The above query will select distinct employee names whose daily absences total more than 3 during the 1st quarter of 2005 and will display the average of the hours worked per day during the same time period grouped by emp_name.

More Group By Query Examples and Discussion:

Aggregate Functions
ggregates are most often used in combination with an SQL Group By clause. ... Note there is no Group By which is normally associated with an aggregate function...

Having Clause SQL
QL Having clause: The having clause is used in conjunction with the SQL group by clause and aggregate functions to categorize and summarize data into groups...

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