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Relational Operators and Logical Operators
It prepares the ground for subsequent sections in which each specific relational operator is paired with its logical counterpart, such that, for example, r1 JOIN r2 denotes the relation representing the extension of the predicate p1 AND p2, the conjunction of the predicates for the operand relations. It follows that where we can find SQL counterparts of those relational operators, invocations of those counterparts will in turn represent extensions of the predicates.
DELETE Statement The DELETE statement eliminates whole rows of data from the specified table or view. Syntax:
Scope Rules You cannot declare an exception twice in the similar block. Though, you can, declare the similar exception in 2 different blocks. The Exceptions declared in a bloc
Advantages of Packages The benefits of the Packages are as shown below: Modularity The Packages encapsulate logically associated items, types, and subprograms in the
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Using DEFAULT You can use the keyword DEFAULT rather than that of the assignment operator to initialize the variables. For e.g. the declaration blood_type CHAR := ’O’; it can b
Scope and Visibility The References to an identifier are resolved according to its visibility and scope. The scope of an identifier is that area of a program unit (subprogram, b
Initializing and Referencing Collections Until you initialize a collection, a nested table or varray is automatically null (i.e. the collection itself is null, not its elements)
Fetching with a Cursor The FETCH statements retrieve the rows in the result set one at a time. After each and every fetch, the cursor advance to the next row in the result set
Overloading The PL/SQL overloads the subprogram names. That is, you can use similar name for few different subprograms as long as their formal parameters differ in the number
Keyword &Parameter Description: index_name: This is an undeclared identifier which can be referenced only within the FORALL statement and only as the collection subscript
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