This is a little tip I learned today from a colleague, and it's something so simple and so effective that I still wonder why it never popped in my ...
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It is a very useful thing if you are querying a database from an external source, for example from a client application, and you want to know what data was actually inserted. Especially if the SQL table generates and modifies some data automatically.
Omg! I had never heard of this, thanks!