VAR_SAMP ( [ DISTINCT | ALL ] value_expression )
Syntax Elements
- DISTINCT
- To exclude duplicates of value_expression from the computation.
- ALL
- All values of value_expression that are not null, including duplicates, are included in the computation.
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value_expression
- A numeric literal or column expression whose sample variance is to be computed.
- The value_expression cannot be a reference to a view column derived from a function, and cannot contain any ordered analytical or aggregate functions.
- If the value_expression is character, the format is the default format for FLOAT.
- If the value_expression is numeric, date, or interval, the format is the same format as x.
- If the value_expression is UDT, the format is the format for the data type to which the UDT is implicitly cast.
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The value_expression cannot be a reference to a view column derived from a function, and cannot contain any ordered analytical or aggregate functions.
- VARIANCE OF A SAMPLE is valid only for numeric data.
- Nulls are not included in the result computation.
- Division by zero results in NULL rather than an error.