Anatomy of a command, PL-SQL Programming

Anatomy of a Command

Figure, showing a simple SQL command, is almost identical to its counterpart in the theory book. The only difference arises from the fact that SQL uses a different notation for assignment to a local variable. (The SQL international standard doesn't actually use the terms update operator and read-only operator, but SQL does embrace those distinct concepts).

1142_Anatomy of a Command.png

Figure: Some terminology

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