The Data Comparison command opens a new Data Comparison window and the Select Database Objects for Comparison dialog box, where you can select tables from two databases that you want to compare. Note that you can disable the display of the selection dialog box in the Data Compare options.
When no data source exists in your project, DatabaseSpy displays a warning message which allows you to add a data source immediately.
Click Yes in the message box to open the Create a Database Connection dialog box.
Also make sure that at least one data source is connected before you select the command to avoid the following message.
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