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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.
Implicit Cursors The Oracle implicitly opens a cursor to process each SQL statement not related with an explicitly declared cursor. The PL/SQL lets you refer to the most recen
IS NULL Operator The IS NULL operator returns the Boolean value TRUE whenever its operand is null or FALSE if it is not null. The comparisons including the nulls always yield NU
Named Notation The second procedure call uses the named notation. An arrow (=>) serve as the relationship operator that associates the formal parameter to the left of the arro
Use Serially Reusable Packages To help you to manage the use of memory, the PL/SQL gives the pragma SERIALLY_ REUSABLE that mark some packages as serially reusable . So mark
Cursor Variables: To execute the multi-row query, the Oracle opens an unnamed work region that stores the processing information. You can use an explicit cursor that names
Example of ADD CONSTRAINT in SQL Example: Alternative formulation for MAX_ENROLMENTS ALTER TABLE IS_ENROLLED_ON ADD CONSTRAINT MAX_ENROLMENTS CHECK ((SELECT COUNT (*)
PL SQL Code Review HEADER ELEMENTS File Name Clear, meaningful and descriptive about main objective of the file. Multiple words are joined using underscores which adh
Effects of NULL in Table Literal When a VALUES expression appears as the source value for an SQL INSERT statement, the key word NULL can appear as a field value, such that for
Boolean Values Only the values TRUE, FALSE, & NULL can be assigned to a Boolean variable. For illustration, given the declaration DECLARE done BOOLEAN; the following statements
PPD , CPA, Filesharing Site Project Description: This is very easy I need a PPD , CPA, Filesharing Site. [PPD] stands for (pay per download) example hotsharecash [Files
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