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All versions of Microsoft SQL Server (not MySQL). Please also add a version-specific tag, like sql-server-2016, since it is often relevant to the question.

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How can I join one table or other depending on a field value?

Create a Type field in a Union query between Ta and Table2 and then join your T table to the Union table. This method assumes that you can union the results of Ta and Table2. Select T.*, UnionTable. …
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