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How to Compare different tables in same Database
Carsten_Davidsen
Posts: 2 New member
I have a DB with two tables where the one is a backup of the other one.
How can I compare the two tables using SQL Data compare.
How can I compare the two tables using SQL Data compare.
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BrainDonor
Posts: 55 Silver 2
Data Compare does it's best to map tables from the Source to the Target. So, it is a two-stage process to override this - you need to unmap what it has mapped and tell it to map the tables as you want it to.
In my example below I'm using a copy of an old ASP_State database and I have copied ASPTempSessions to ASPTempSessions_Copy. Currently, Data Compare has mapped the tables as you would expect.
First, I select ASPTempSessions and click on the 'unmap' button.
Then I select ASPStateTempSessions_Copy and do the same. This gives me a screen that shows tables that are no longer mappedy, in the lower half of the dialog.
Now, I can select the two tables that I want to compare against each other.
And then press 'Map'. This will then the two tables mapped to each other, so you can select them for camparison.
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I've used it this way for checking how data has changed, after a test run of an update.
I selected my DB as Source and Target
Clicked on tap Tables and Views.
How can I select the two tables I marked in the picture ?