Teradata Partition By Example
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FAQ
Teradata offers two types of partitioning: primary index partitioning and column partitioning. Primary index partitioning splits a table based on the values of its primary index column or columns, which are also used for distribution.
Teradata partitions allow you partition table data by range, case, or column.
Data Aggregation- The ?PARTITION BY? clause can be used to perform aggregation (such as sum, average, count, etc.) on subsets of data based on specific columns. For example, you can calculate the total sales of each product in each quarter of the year.
PARTITION BY clause is used to define the partition. CREATE SET TABLE Orders ( StoreNo SMALLINT, OrderNo INTEGER, OrderDate DATE FORMAT 'YYYY-MM-DD', OrderTotal INTEGER ) PRIMARY INDEX(OrderNo) PARTITION BY RANGE_N ( OrderDate BETWEEN DATE '2010-01-01' AND '2016-12-31' EACH INTERVAL '1' DAY );
Hear this out loud PausePartitioning can be accomplished in two ways: by duplicating data into a new table or by utilizing an ALTER TABLE statement. Before proceeding, assessing the necessary resources for both methods is important. To do this, we will generate a test table with row partitions and populate it with 100,000 records.