Example: Aggregate Function with Parameter Style TD_GENERAL - Analytics Database - Teradata Vantage

SQL External Routine Programming

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-07-11
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iiv1628111441820.ditamap
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B035-1147
lifecycle
latest
Product Category
Teradata Vantage™

This aggregate function declaration uses parameter style TD_GENERAL:

/*****  C source file name: STD_DEV.c  *****/
   
#define SQL_TEXT Latin_Text
#include <sqltypes_td.h>
#include <string.h>
#include <math.h>
void STD_DEV ( FNC_Phase     phase,
               FNC_Context_t *fctx,
               FLOAT         *x,
               FLOAT         *result,
               char          sqlstate[6] )
{
     ...
}

The corresponding CREATE FUNCTION statement looks like this:

CREATE FUNCTION STD_DEV(x FLOAT)
RETURNS FLOAT
CLASS AGGREGATE
LANGUAGE C
NO SQL
PARAMETER STYLE TD_GENERAL
EXTERNAL;