Primary key considerations

Every record contains one attribute that is defined as the primary key, which uniquely identifies the record. The primary key is the first attribute listed by the ?atr command.

When you use the select command to specify a record, you must always use the primary key. If it is not specified, piconfig assumes * (all records).

For example, the primary key for the PIPOINT table is TAG. When you select the subset of tags with point source F, the primary key is also included, as shown:

@select tag=*, pointsource=F