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- SDDS_SetColumnFlags---Sets all column-selection flags to a given value, indicating whether
columns are initially ``of interest'' or not). By default, all columns are initially
of interest.
- SDDS_SetColumnsOfInterest---Modifies the ``of interest'' status of columns using lists of
column names, wildcard matching, and so forth. General two-term logic is possible using the
previous status of each column and the results of newly-requested matching.
- SDDS_DeleteColumn---Deletes a named column from the current data table of a data set.
- SDDS_DeleteUnsetColumns---Deletes all ``unset'' columns--i.e., those not declared as ``of
interest''.