17.05 - Example: Dropping 2 Columns from a Column Partition Which Also Drops the Partition - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1144-175K
Language
English (United States)

This example drops two columns from a column partition, and because that leaves the partitions with no columns, also drops the column partition.

     ALTER TABLE orders 
     DROP o_alt_ship_addr, 
     DROP o_alt_bill_addr;

This results in a table definition as follows. note that ADD option value for level 1 increases to 3.

     CREATE TABLE orders (
       o_orderkey       INTEGER NOT NULL,
       o_custkey        INTEGER,
       o_orderstatus    CHARACTER(1) CASESPECIFIC,
       o_totalprice     DECIMAL(13,2) NOT NULL,
       o_ordertsz       TIMESTAMP(6) WITH TIME ZONE NOT NULL,
       o_salesperson    VARCHAR(5),
       o_ordersubstatus CHARACTER(1) CASESPECIFIC,
       o_ship_addr      VARCHAR(500),
       o_bill_addr      VARCHAR(200),
       o_item_count     INTEGER )
     PARTITION BY (COLUMN ALL BUT ( (o_orderstatus, o_ordersubstatus),
                                     ROW(o_ship_addr, o_bill_addr) 
                                     NO AUTO COMPRESS) ADD 3,
                   RANGE_N(o_ordertsz 
                   BETWEEN TIMESTAMP '2003-01-01 00:00:00.000000+00:00'
                   AND     TIMESTAMP '2009-12-31 23:59:59.999999+00:00' 
                   EACH INTERVAL '1' MONTH) ),
     UNIQUE INDEX(o_orderkey);