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Message Posted: Wed, 20 Jun 2007 @ 19:54:02 GMT

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Subj:   Re: Mload script to copy data from 1 table to another table in Teradata
From:   Michael Larkins

The problem with this is:

  Try with the following syntax.  

          > Create databasename.table
          >    (as sel * from databasename.table name)
          >    with data;

You will most likely create a set table with a NUPI on the first column. If there are a lot of hash collisons it will slow down the copy process looking for duplicate rows.

As Fred mentioned, you should at least use a PI definition, but probably better to use the original table to get the same PI and any/all SI definitions as well as any constraints that might exist on the original table.

Just an added thought,

Michael Larkins
Certified Teradata Master
Certified Teradata SQL Instructor

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