15.10 - Example: Statistics Are Not Copied If An OLAP Operation Is Specified In The Subquery - Teradata Database

Teradata Database SQL Data Definition Language Syntax and Examples

prodname
Teradata Database
vrm_release
15.10
created_date
December 2015
category
Programming Reference
featnum
B035-1144-151K

Teradata Database does not copy statistics if an OLAP function is specified in the subquery as the examples in this set demonstrate.

Example1

In this example, Teradata Database does not copy statistics because of the OLAP RANK function in the subquery.

    CREATE TABLE t3 (c1, c2, c3) AS (SELECT x, RANK(y), z
                                     FROM test 
                                     QUALIFY RANK(X)> 1) 
    WITH DATA AND STATISTICS;

Example2

In this example, Teradata Database does not copy statistics because of the partial data returned by the SAMPLE operator.

    CREATE TABLE t3 (c1, c2, c3) AS (SELECT x, y, z
                                     FROM test SAMPLE 4) 
    WITH DATA AND STATISTICS;