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Restriction in SQL
Syntax:
SELECT DISTINCT StudentId
FROM IS_CALLED
WHERE Name = 'Boris'
The WHERE clause operates on the result of the FROM clause in analogous fashion to the way it operates on an arbitrary relation expression. Name = NAME ('Boris') is an open expression. The key word DISTINCT here is redundant, as it happens, because StudentId is a declared key for IS_CALLED.
Control Structures The Control structures are the most important PL/SQL extension to the SQL. Not only does PL/SQL let you manipulate Oracle data, it lets you process the data
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What are the rates for help in writing PL/SQL procedures and functions?
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