Help Center/ GaussDB(DWS)/ Tool Guide/ DSC/ SQL Syntax Migration Reference/ Teradata Syntax Migration/ Schema Objects and Data Definition Language (DDL)/ Migrating Tables/ COLUMN STORE
Updated on 2024-07-19 GMT+08:00
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COLUMN STORE

The table orientation can be converted from ROW-STORE to COLUMN store using the WITH (ORIENTATION=COLUMN) in the CREATE TABLE statement. This feature can be enabled/disabled using the rowstoreToColumnstore configuration parameter.

Input: CREATE TABLE with change orientation to COLUMN STORE

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CREATE MULTISET VOLATILE TABLE tab1
      ( c1 VARCHAR(30) CHARACTER SET UNICODE    
      , c2 DATE
      , ...
      )
 PRIMARY INDEX (c1, c2) 
 ON COMMIT PRESERVE ROWS;

Output:

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CREATE LOCAL TEMPORARY TABLE tab1 
     ( c1 VARCHAR(30)  
     , c2 DATE   
     , ...
     ) WITH (ORIENTATION = COLUMN)
  ON COMMIT PRESERVE ROWS 
  DISTRIBUTE BY HASH (c1, c2);
Parent topic: Migrating Tables