Teradata:如何将范围分区添加到非空表? [英] Teradata: How to add range partition to non empty table?

问题描述

我有这样的桌子:

CREATE SET TABLE ONLINE_BANKING.TRANSACTIONS ,NO FALLBACK ,
     NO BEFORE JOURNAL,
     NO AFTER JOURNAL,
     CHECKSUM = DEFAULT,
     DEFAULT MERGEBLOCKRATIO
     (
      transaction_id INTEGER NOT NULL,
      date_of_transaction DATE FORMAT 'YYYYMMDD' NOT NULL,
      amount_of_transaction DECIMAL(38,2) NOT NULL,
      transaction_type_code BYTEINT NOT NULL DEFAULT 25 , 
UNIQUE PRIMARY INDEX ( transaction_id );

我想向 date_of_transaction 列的填充数据表添加分区.

I would like to add partition to my filled with data table to date_of_transaction column.

我试过这种方式:

ALTER TABLE TRANSACTIONS
MODIFY PRIMARY INDEX (date_of_transaction) -- tried to write different columns, but failed
ADD RANGE BETWEEN DATE '1998-01-01' AND DATE '2015-12-31' EACH INTERVAL '1' MONTH;

然而 Teradata 返回错误:

However Teradata returned error:

DROP RANGE/ADD RANGE 子句无对应级别即为 RANGE_N 函数

DROP RANGE/ADD RANGE clause no corresponding level that is a RANGE_N function

这是什么意思，我如何才能实现目标?

What does it mean and what how can I achieve the goal?

推荐答案

您不能向未分区的现有表添加分区，但只能在已分区表中添加或删除范围.

You can't add partitioning to an existing table which is not partitioned, yet, you can only add or drop ranges from a partitioned table.

唯一的方法是像这样创建一个新表和 INSERT/SELECT:

The only way is to create a new table and INSERT/SELECT like this:

CREATE SET TABLE ONLINE_BANKING.TRANSACTIONS_PPI ,NO FALLBACK ,
     NO BEFORE JOURNAL,
     NO AFTER JOURNAL,
     CHECKSUM = DEFAULT,
     DEFAULT MERGEBLOCKRATIO
     (
      transaction_id INTEGER NOT NULL,
      date_of_transaction DATE FORMAT 'YYYYMMDD' NOT NULL,
      amount_of_transaction DECIMAL(38,2) NOT NULL,
      transaction_type_code BYTEINT NOT NULL DEFAULT 25 , 
      ...)
PRIMARY INDEX ( transaction_id )
PARTITION BY
   RANGE_N (date_of_transaction BETWEEN DATE '1998-01-01' AND DATE '2015-12-31' 
   EACH INTERVAL '1' MONTH);

INSERT INTO ONLINE_BANKING.TRANSACTIONS_PPI
SELECT * FROM ONLINE_BANKING.TRANSACTIONS;

-- when everything is ok
DROP TABLE ONLINE_BANKING.TRANSACTIONS;
RENAME TABLE ONLINE_BANKING.TRANSACTIONS_PPI AS ONLINE_BANKING.TRANSACTIONS;

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