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ALL_ SPACE_ COUNT (system data metric function)¶
Returns the count of non-NULL column values that are not empty but contain only whitespace characters.
This topic provides the syntax for calling the function directly. To learn how to associate the function with a table or view so it runs at regular intervals, see Associate a DMF.
Syntax¶
Arguments¶
querySpecifies a SQL query that projects a single column.
Allowed data types¶
The column projected by the query must have the VARCHAR data type.
Returns¶
The function returns a NUMBER value. NULL values are not counted.
Usage notes¶
- Whitespace characters are spaces, tabs, line breaks, other ASCII whitespace characters, and the no-break space (U+00A0). Other Unicode space characters, such as the ideographic space (U+3000), are not treated as whitespace.
- The empty string
''is not counted. To count empty strings, use EMPTY_STRING_COUNT.
Example¶
Measure the number of whitespace-only values in the comment column: