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Updating Tables in SQL
The topic of updating by describing the assignment operator, ":=" in Tutorial D. SQL uses a different syntax for assignment, using the key word SET and "=". Thus, to add 1, so to speak, to the integer variable x, SQL has SET x = x + 1. However, the operator is not supported at all for tables, so SQL has no direct counterpart. It does, however, have counterparts of Tutorial D's INSERT, UPDATE, and DELETE operators, which we can deal with here quite briefly by giving translations to SQL.
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