The sdb.ctl is a client library which can be used to access relational databases from the WinCC OA client without the need to install any database client software at the client. The connection to the relational database is handled by the WinCC OA server. The client communicates with the WinCC OA server only by data points. The SQL-Statements are transferred by data points to a WinCC OA control, this control executes the SQL-Statements and sends back the result to the client by data points.

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