Crystal Reports equivalent of 'WHERE'

问题

I'm familiar with SQL but not Crystal Reports. I'm trying to deal with an imported data set with 5 columns:

id           deathDate           giftDate        giftAmount       Dead
123           2008-01-06          2011-09-08       25.00          TRUE
456           2009-06-08          2011-10-13       10.00          TRUE
789              0                2011-12-04       50.00          FALSE
...

I'm trying to do a subquery but can't figure out what the CR equivalent of WHERE in SQL would be. I'd like to do something along the line of:

SELECT count(id) from tab1 where dead=TRUE

Any suggestions?

回答1:

As Conrad and dotjoe have observed, the Crystal equivalent of the sql where clause is the Select Expert - you should be able to find this on the Report menu.

If you need to include both true and false Dead records in the detail section, but want a total for only those records where Dead is true, the simplest way to do this would be to set up a formula item. To do so:

Right-click on the Formula Fields option in the Field Explorer and select New... .
Enter a suitable formula field name, like DeadCount.
In the Formula editor, enter a formula like the following (assuming Dead is a string):

If {tab1.Dead} = 'TRUE' then 1
Use the x-2 button (or Alt-C) to check that the formula does not have any errors, then press the Save and Close button to exit the formula editor.
Drag and drop the new formula field from the Field Explorer onto anywhere in the report.
Right-click on the formula field that you have just added to the report and select Insert > Summary... from the menu.
In the Insert Summary dialog, specify the Summary operation as Sum and the Summary location as Grand Total (Report Footer), then click OK. A summarised field, labelled something like Sum of @DeadCount, should appear in the Report Footer. (You should now remove the un-summarised formula field from where you placed it in the report design area.)

This technique is essentially similar to including a summed case value in a sql query - something like: select sum(case when Dead = 'TRUE' then 1 end) as DeadCount from tab1

回答2:

Add this to the record selection formula...

{datasetname.Dead} = true 
//note: I'm not sure what data type that is but CR uses bool for bit and XSD bool

Then add a summary field to the report footer which does the count(id).

Or, if you need to display the dataset and only need a subquery you can use something called a "Running Total" field. In here you can do the count(id) and add the where clause to the necessary formula.

来源：https://stackoverflow.com/questions/9439169/crystal-reports-equivalent-of-where

标签

sql

crystal-reports