Add Command when selecting data tables
I've been playing with the Add Command option that allows you to enter an SQL statement to select data for the report. I was wondering what people use this type of command for? I've used Crystal over 10 years but while I've been using Crystal XI for only about 3 years, I have never used this option.
So what advantages does it have over the graphically selection and linking of data tables?
What types of reporting is usually done with them?