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Second Step at defining type SID in SQL
CREATE TYPE SID AS VARCHAR(5) ;
Explanation:
Under this definition, SID('S1') is exactly equivalent to the same expression in Tutorial D, and the SQL expression CAST(s AS VARCHAR(5)), where s is a value of type SID, is equivalent to Tutorial D's THE_C(s). However, we have no way of further constraining the string values representing student identifiers; so SID('34x.1'), for example, also denotes a value of type SID, as does SID(' ').
Updating by insertion Syntax : INSERT INTO ENROLMENT VALUES (SID ('S4'), 'Devinder', CID ('C1'));
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Special cases of projection This section describes the identity projection, r {ALL BUT}, and the projection on no attributes, r { }, which yields TABLE_DUM when r is empty, ot
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Demonstrate your knowledge of PL/SQL programming by writing and thoroughly testing triggers and stored procedures associated with an e-commerce application that provides security l
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which operation is used if we are interested in only certain columns of a table?
Initializing Objects: Till you initialize an object by calling the constructor for its object type, the object is automatically null. That is, the object itself is null, not me
Main features of PL/SQL A good way to get familiar with PL/SQL is to look at a sample program. The below program processes an order for tennis rackets. At first, it declares a
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