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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.
set serveroutput on declare a number(5); b number(5); c number(5); begin a:=&a; b:=&b; c:=a/b; dbms_output.put_line(c); exception when zero_d
Data Types in SQL - XML, Array, Row BINARY LARGE OBJECT for arbitrarily large bit strings. XML for XML documents and fragments. ARRAY types for arrays.
1- You can check attribute names from each table in DBF11 by running for example: desc dbf11.Member; desc dbf11.Agent; desc dbf11.Producer; Because some attribute names in
Opening a Cursor Opening the cursor executes the query & identifies the result set that consists of all rows that meet the query search criteria. For the cursors declared usin
Transaction Visibility As the figure shows, the changes made by an autonomous transaction become visible to another transaction whenever the autonomous transaction commits. Th
Parameter and Keyword Description: record_type_name: This identifies the user-defined type specifier that is used in the subsequent declarations of the records. NOT N
Parameter and Keyword Description: procedure_name The user-defined procedure is declared by this construct. parameter_name: This identifies the formal parameter t
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
Semidifference and NOT - SQL In this section first describe the relational difference operator, named MINUS. Example here shows SQL's closest counterpart of that operator.
Project Description: I want to rebuild it and add better content to it It will include up to 5 forms The data will be saved on SQL server and the data access layer could b
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