sql - Teradata 到 Postgres : SQL translation for SET table, 没有回退，在日志之前没有，在日志之后没有？

Question

CREATE OR REPLACE SET TABLE SAMPLE
  ,NO FALLBACK
  ,NO BEFORE JOURNAL
  ,NO AFTER JOURNAL
  ,CHECKSUM = DEFAULT
  ,DEFAULT MERGEBLOCKRATIO
(ACCT_ID VARCHAR(60) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
,EMP_SAL CHAR(1) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL)); 

如何在 Postgres 中翻译这些选项？

Answer 1

您可以删除所有表级选项:

CREATE OR REPLACE SET TABLE SAMPLE -- There'n no OR REPLACE in TD and PG
  ,NO FALLBACK -- keeps a copy of every row, doesn't exist in PG -> remove it
  ,NO BEFORE JOURNAL -- Journalling options
  ,NO AFTER JOURNAL  -- -> remove
  ,CHECKSUM = DEFAULT -- checksumming datablocks to prevent writing/reading bad data -> remove
  ,DEFAULT MERGEBLOCKRATIO -- Combine smaller data blocks during Insert/Update/Delete -> remove
(ACCT_ID VARCHAR(60) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
,EMP_SAL CHAR(1) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL)); 

CHARACTER SET LATIN:据我所知，PG 中没有选项可以在列级别指定字符集，只能在数据库级别指定。

NOT CASESPECIFIC:PG 中不存在为 CHAR 列指定区分大小写(它始终区分大小写)，只有 citext module .