Toad Data Studio 1.1 - User Guide

Set HAVING Conditions

You can set a Having condition that defines conditions for displaying groups in a query.

Notes:

• You must add a Group By clause for this option to be available.

• If you reverse engineer a query that contains a Having condition from the Editor or edit it in the Query tab of the Query Builder, it displays in a Global Having Clause on the Diagram pane rather than the Having Condition field below the Diagram pane. You can double-click the Global Having clause, or can click to edit it
• This topic focuses on information that may be unfamiliar to you. It does not include all step and field descriptions.

To set a Having condition

1. Select a column from a table in the Diagram tab.

2. Select the Having Condition field below the column and click .

3. Complete the fields as necessary. Review the following for additional information:

   Form Tab	Description
   Field	Select an operator or predicate to use in this condition.
   Aggregate	Select one of the following functions to calculate column values: Avg—Returns the average of the values in a group. Avg (Distinct)—Returns the average of the unique values in a group. Count—Returns the total number of items in a column. This function does not ignore NULL values when calculating results. Count (Distinct)—Returns the total number of unique values in a column. Max—Returns the maximum value for the column. Min—Returns the minimum value for the column. Stddev—Returns the sample standard deviation of a numeric expression evaluated over a set. Sum—Returns the sum of all the values in the expression. Sum (Distinct)—Returns the sum of all the unique values in the expression. Variance—Returns a statistical measure of how far a set of numbers are spread out from each other. Note: If you add a Group By clause, you must specify an aggregate function for any remaining columns.
   Value 1 Type Value 2 Type	Select whether the expression is a column or constant. After selecting this option, select the column name or enter a constant in the field. Note: The Value 2 Type field is only available if you selected the Between predicate.
   Formula Tab	Description
   Functions	Perform an incremental search or select a function, and then select a column on which to perform the function.
   Operators	Select an operator or predicate to use in this condition.
   Columns and Calculated Fields	Select a column to apply a function or operator against.

Tip: To remove a Having condition, open the Having condition window and click Remove.

Related Topics

Build Queries Visually 

Add Subqueries