Numeric Value Function

<numeric_value_function> ::= 
       AGGREGATE(<set> [, <numeric_value_expression>])
     | AVG(<set>[, <numeric_value_expression>])
     | CORRELATION(<set> [, <numeric_value_expression>]
          [, <numeric_value_expression>])
     | COVARIANCE(<set>[, <numeric_value_expression> 
          [, <numeric_value_expression>])
     | COUNT(<set>[, INCLUDEEMPTY])
     | LINREGINTERCEPT(<set>[, <numeric_value_expression> 
          [, <numeric_value_expression>])
     | LINREGPOINT(<numeric_value_expression>, <set>, 
          <numeric_value_expression> [, <numeric_value_expression>])
     | LINREGR2(<set>, <numeric_value_expression> 
          [, <numeric_value_expression>])
     | LINREGSLOPE(<set>[, <numeric_value_expression> 
          [, <numeric_value_expression>])
     | LINREGVARIANCE(<set>, <numeric_value_expression> 
          [, <numeric_value_expression>])
     | MAX(<set>[, <numeric_value_expression>])
     | MEDIAN(<set>[, <numeric_value_expression>])
     | MIN(<set>[, <numeric_value_expression>])
     | RANK(<tuple>, <set>)
     | STDEV(<set>[, <numeric_value_expression>])
     | SUM(<set>[, <numeric_value_expression>])
     | VAR(<set>[, <numeric_value_expression>])