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DECLARE:
This keyword signals the beginning of the declarative section of the PL/SQL block, that contains local declarations. The Items declared locally exist only within the present block and all its sub-blocks and are not noticeable to enclosing blocks. The declarative section of the PL/SQL block is optional. It is terminated implicitly by using the keyword BEGIN that introduces the executable section of the block.
The PL/SQL does not allow the forward references. Therefore, you should declare an item before referencing it in other statements, including the other declarative statements. You should also declare the subprograms at the end of a declarative part after all other program items.
collection_declaration:
These identify an index-by table, nested table, or varray previously declared within the present scope.
constant_declaration:
A constant can be declared by using this construct.
cursor_declaration:
These constructs declares an explicit cursor
cursor_variable_declaration
These construct declares the cursor variable.
exception_declaration
These construct declares an exception.
object_declaration
These identify an object (or instance of an object type) formerly declared within the present scope.
Stored Subprograms Normally, tools (like Oracle Forms) which incorporate the PL/SQL engine can store subprograms locally for later, strictly local execution. Though, to become
Inserting Objects: You can use the INSERT statement to add objects to an object table. In the illustration below, you insert a Person object into the object table persons:
How do I display usernames for students from a student table, assigning each student a username initials001 (initials is the actual student initials), and if the students initials
LOOP Statements The LOOP statements execute a series of statements at multiple times. The loops enclose the series of statements that is to be repeated. The PL/SQL provides typ
Description: Demonstrate your knowledge of PL/SQL programming by writing and thoroughly testing triggers and stored procedures associated with an e-commerce application that pr
Inner Join We have learned how to retrieve data from one table by using SELECT statement. But, as we have learned, normalized relational databases mean the data is spread betw
Controlling Autonomous Transactions The first SQL statement in an autonomous routine starts a transaction. Whenever one transaction ends, the next SQL statement starts the oth
Parameter and Keyword Description: collection_name: This keyword identifies the index-by table, nested table, or varray formerly declared within the present scope. cu
Parameter SELF in pl/sql The MEMBER methods recognize a built-in parameter named SELF that is an instance of the object type. Whether declared explicitly or implicitly, it is
Packages The package is a schema object which groups logically associated to the PL/SQL items, types, and subprograms. The Packages have 2 sections: the specification & the bod
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