The PHYSDB variable holds the name of the Ingres physical database
to which an SQL query is to be directed. This variable must be defined
whenever an SQL database file is used otherwise an error will be generated.
Only one physical database can therefore be referred to from one GRG file.
The example program fragment below sets the physical database name to mydb.
%%DEFINE PHYSDB mydb
This variable is not needed if the GNU SQL Server database is being used as this does not support multiple physical databases.
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