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Up: Note 212: Basic Flat Table to MeasurementSet Conversion Previous: Basic Mapping

Indexing Issues

The main table and subtables within a MeasurementSet may not have the same number of rows. As a result, accessing pieces of information in different subtables will sometimes require more complicated indexing than in a standard flat table.

In general, this can be treated using the table 'query' method to create subtables based on indexing expressions.

For example,

-

It is useful to note that two of the major tables for data analysis, the main table and NS_GBT_BACKEND do have the same number of rows so the indexing is trivial in this case.


next up previous
Up: Note 212: Basic Flat Table to MeasurementSet Conversion Previous: Basic Mapping
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2006-03-28