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Consider a help desk application that allows support staff to create support tickets, where each ticket in the system exists as a record in the Tickets table. To ease data entry, let's say that administrative users can create "ticket templates," which pre-define the values for a number of ticket data points that are stored in a table named Ticket Templates. Applying a template to an existing ticket would require that the existing record in the Tickets table have its non-set data points assigned to the corresponding default values of the selected template. Aggregates are also used a lot for reporting purposes and for statistical computation.
Once this value has been assigned, the following UPDATE statement could be executed to copy the template's pre-defined values to the non-assigned data points in the Tickets table: UPDATE Tickets SET Priority Id = ISNULL(Tickets.
It was originally a record manager published by Soft Craft.
Btrieve was written by Doug Woodward and Nancy Woodward and initial funding was provided in part by Doug's brother Loyd Woodward.
It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
When testing for a non-NULL value, IS NOT NULL is the recommended comparison operator to use in SQL.