index number

Details

Last Updated on Tuesday, 12 February 2013 16:32

Definition:

The GeoDMS calculates with arrays. In an array each entry refers to a value for a certain position in the array. The index number defines the position of each entry, implemented in the GeoDMS by default as as zero based serial numbers (both one- and two-dimensional). The start and end position of the set of serial numbers can be different, if a range property is used for the domain unit or it is configured with a range function.

Index numbers are relevant especially in combining arrays of different domain units e.g. in relational or aggregation functions. An array with index numbers of a different domain as the domain unit of the array is called a partitioning.

Function:

Index numbers can be calculated with the id function. The values unit of an index number is the domain unit for which the index numbers are calculated.