This example shows an instance of the DataSubset specialization of the WhereClause class that defines a compound expression for "Example flag 1 is not missing or N". The compound expression of the DataSubset class negates another compound expression that specifies that the value of the EXMPFL variable in the ADVS dataset is missing or the value of the EXMPFL variable in the ADVS dataset is equal to "N", which . The compound expression of the DataSubset class could be expressed as:
NOT (ADVS.EXMPLFL EQ '' OR ADVS.EXMPLFL EQ 'N')
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