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Asked: 2026-05-27T12:27:21+00:00

I’m importing more than 600.000.000 rows from an old database/table that has no primary

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I’m importing more than 600.000.000 rows from an old database/table that has no primary key set, this table is in a sql server 2005 database. I created a tool to import this data into a new database with a very different structure. The problem is that I want to resume the process from where it stopped for any reason, like an error or network error. As this table doesn’t have a primary key, I can’t check if the row was already imported or not. Does anyone know how to identify each row so I can check if it was already imported or not? This table has duplicated row, I already tried to compute the hash of all the columns, but it’s not working due to duplicated rows…

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1 Answer

  1. Editorial Team

    I would bring the rows into a staging table if this is coming from another database — one that has an identity set on it. Then you can identify the rows where all the other data is the same except for the id and remove the duplicates before trying to put it into your production table.

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