17.10 - Example: Statistics Are Not Copied When Set Or Aggregation Operators Are Specified In The Query - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1144-171K
Language
English (United States)

Vantage does not copy statistics if set operators or aggregation operations are specified in the query as these examples demonstrate.

Example1

In this example, Vantage does not copy statistics because of the aggregating GROUP BY clause in the subquery.

    CREATE TABLE t3 (c1, c2) AS (SELECT MAX(x), y
                                 FROM test   
                                 GROUP BY 2) 
    WITH DATA AND STATISTICS;

Example2

In this example, Vantage does not copy statistics because of the aggregating GROUP BY clause in the subquery:

    CREATE TABLE t3 (c1, c2) AS (SELECT COUNT(x), y 
                                 FROM test 
                                 GROUP BY 2) 
    WITH DATA AND STATISTICS;

Example3

In this example, Vantage does not copy statistics because of the aggregating GROUP BY and HAVING clauses in the subquery.

    CREATE TABLE t3(a, b, c) AS (SELECT x1, MIN(y1), AVG(a1)
                                 FROM test1 
                                 GROUP BY x1 
                                 HAVING AVG(y1) > 40) 
    WITH DATA AND STATISTICS;