Result Type and Format

Teradata Vantage™ SQL Functions, Expressions, and Predicates

brand
Software
Teradata Vantage
prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1145-162K

The result data type and format for window aggregate functions are as follows.

Function Result Type Format
AVG(x)

where x is a character type

FLOAT Default format for FLOAT
AVG(x)

where x is a numeric, DATE, or INTERVAL type

FLOAT Same format as operand x
  • CORR(x,y)
  • COVAR_POP(x,y)
  • COVAR_SAMP(x,y)
  • REGR_AVGX( y,x)
  • REGR_AVGY( y,x)
  • REGR_INTERCEPT(x,y)
  • REGR_R2(x,y)
  • REGR_SLOPE(x,y)
  • REGR_SXX(x,y)
  • REGR_SXY(x,y)
  • REGR_SYY(x,y)
  • STDDEV_POP(x,)
  • STDDEV_SAMP(x,)
  • VAR_POP(x,)
  • VAR_SAMP(x)

where x is a character type

FLOAT Default format for FLOAT
  • CORR(x,y)
  • COVAR_POP(x,y)
  • COVAR_SAMP(x,y)
  • REGR_AVGX (y,x)
  • REGR_AVGY( y,x)
  • REGR_INTERCEPT(x,y)
  • REGR_R2(x,y)
  • REGR_SLOPE(x,y)
  • REGR_SXX(x,y)
  • REGR_SXY(x,y)
  • REGR_SYY(x,y)
  • STDDEV_POP(x)
  • STDDEV_SAMP(x)
  • VAR_POP(x)
  • VAR_SAMP(x)
where x is one of the following types:
  • Numeric
  • DATE
  • Interval
Same data type as operand x. Default format for the data type of operand x
REGR_AVGX(y,x)

REGR_AVGY(y, x)

where x is a UDT

  Default format for the data type to which the UDT is implicitly cast.
COUNT(x)

COUNT(*)

REGR_COUNT(x ,y)

where the transaction mode is ANSI

If MaxDecimal in DBSControl is…
  • 0 or 15, then the result type is DECIMAL(15,0) and the format is -(15)9.
  • 18, then the result type is DECIMAL(18,0) and the format is -(18)9.
  • 38, then the result type is DECIMAL(38,0) and the format is -(38)9.

ANSI transaction mode uses DECIMAL because tables frequently have a cardinality exceeding the range of INTEGER.

COUNT(x)

COUNT(*)

REGR_COUNT(x,y)

where the transaction mode is Teradata

INTEGER

Teradata transaction mode uses INTEGER to avoid regression problems.

You can cast the final result of a COUNT window aggregate function; however, the cast is not used as part of the window function computation as it is for the COUNT aggregate function and, therefore, cannot be used to avoid numeric overflow errors that might occur during the computation.
Default format for INTEGER
MAX(x), MIN(x) Same data type as operand x. Same format as operand x
SUM(x)

where x is a character type

Same as operand x. Default format for FLOAT
SUM(x)

where x is a DECIMAL(n,m) type

DECIMAL(p,m), where p is determined according to the following rules:
If MaxDecimal in DBSControl is 0 or 15 and
  • n  ≤  15, then p = 15.
  • 15 < n  ≤  18, p = 18.
  • n  > 18, then p = 38.
If MaxDecimal in DBSControl is 18 and
  • n  ≤  18, then p = 18.
  • n  > 18, then p = 38.

If MaxDecimal in DBSControl is 38 and n  = any value, the p = 38.

Default format for DECIMAL
SUM(x)

where x is any numeric type other than DECIMAL

Same as operand x. Default format for the data type of the operand