Do a temporary user logon and run sql command from that user (SQL INJ)

İn SQL injection, how to do a temporary user logon and run sql command from that user? (in stacked-queries based SQL injection)

Is it possible to do this? I googled this thing, and I saw “EXECUTE AS” statement but I understand this.

So, I have login credentials for user and I need to execute a SQL command from the specified user.

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