This window is used to build an individual Where Clause. You enter this window by clicking on NEW or MOD in the Where tab.
You may also wish to refer to our summary of Where Clause Syntax.
The layout of this window reflects the normal format of a Where clause, which is:
column_name operator value
cust_name = 'Smith'
purchase_time > CURRENT TIME – 1 DAY
substr(cust_name,1,2) = ‘FR’
cust_type NOT IN (‘a’,’b’)
The column may have a Column Function applied to it.
To specify the column value, you can:
As you build the Where clause, the full text of the clause will be displayed in the Where Clause text box.
This specifies whether the value in the Column Value box is to have quotes placed around it. AQT will (normally) be smart enough to set this appropriately for your column type. However in some cases you may want to set this yourself.
A sub-selects allow you to compare your column to a value in another table.
Clicking Build Sub Select will take you to the Build Sub Select dialog where you can specify the sub-select.
When you have a BETWEEN clause you need to specify two values for the column (eg. BETWEEN 100 AND 200). You will get a dfferent style Column Values panel where you can specify these two values.
Enter the value in the box, or click Get Values and select from the dropdown list.
When you have an IN clause you can specify multiple values for a column - eg. IN (‘A’,’B’,’C’,’D’).
To make it easier to deal with a list of values, click on Build IN Clause. This will show the Build IN Clause dialog.
If you are entering the values manually, you must include the quote for each value. Use quotes is ignored in this case.
For character columns, AQT will show you operators Starts With and Contains. These are not valid SQL operators, but make it easier for you to build the appropriate clauses using the LIKE operator.
In some rare cases you may not be comparing a column, but are comparing a special register or constant. Examples:
USER = 'test'
CURRENT DATE > '2010-03-04'
23 > 56 (I've no idea why someone might want to do this!)
You can specify a Where Clause like this by entering the first value (USER, CURRENT DATE, 23 etc) in the Column Function box.
If you are building a summary query, you will see another checkbox This is a HAVING clause.
When you check this box, you will be building a Having Clause, rather than Where Clause. The Column Functions will show column summary functions. For a Having Clause you must select one of these.