The NULL Predicate determines if a column in a selected row is defined or not.
Note: It is illegal to say Column_Reference = NULL.
Column_Reference IS [ NOT ] NULL
| Column_Reference | Specifies the column name (alias). |
The following example retrieves rows consisting of the FileName and DocAuthor for all files under the virtual root /contracts where DocAuthor is defined.
SELECT FileName, DocAuthor FROM SCOPE('"/contracts"') WHERE DocAuthor IS NOT NULL
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