15.00 - Collecting Statistics on a UDF - Teradata Database

Teradata Database SQL Data Definition Language Detailed Topics

prodname
Teradata Database
vrm_release
15.00
category
Programming Reference
featnum
B035-1184-015K

Collecting Statistics on a UDF

You can collect statistics on deterministic UDFs.

For example, suppose you create the following UDF.

     CREATE FUNCTION months_between(Date1 TIMESTAMP, Date2 TIMESTAMP)
     RETURNS FLOAT
     LANGUAGE C 
     NO SQL
     DETERMINISTIC
     SPECIFIC months_between_tt
     EXTERNAL NAME 'CS!months_between_tt!$PGMPATH$/months_between_tt.c'
     PARAMETER STYLE SQL;

The following request collects statistics on the UDF months_between().

     COLLECT STATISTICS 
     COLUMN months_between(BEGIN(policy_duration),
     END(policy_duration)) AS Stats_MthsBetweenBegAndEnd
     ON Policy_Types;