Database Reference
In-Depth Information
So to paraphrase and summarize, a tuple variable is bound in an expression if it is
associated with a quantifier; once bound, it remains in this state for the expression. Here
is another illustration:
Example 8: The example below should further clarify the correct usage of bound and
free variables.
Example 9: List surname of students with DoB after 1975 (assuming the date format
of YYYYMMDD).
Example 10: Find programs (names) that do not include course M100.
Example 11: List courses (code and name) that occur in all disciplines programs).
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