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Programs calling a database which accords to the [[SQL]] standard receive an indication about the success or failure of the call. This return code - which is called SQLSTATE - consists of 5 bytes. They are divided into two parts: the first and second bytes contain a '''class''' and the following three a '''subclass'''. Each class belongs to one of four '''categories''': "S" denotes "Success" (class 00), "W" denotes "Warning" (class 01), "N" denotes "No data" (class 02) and "X" denotes "Exception" (all other classes).
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