Package standard in pl/sql, PL-SQL Programming

Assignment Help:

Package STANDARD

package named STANDARD defines the PL/SQL atmosphere. The package specification globally declares the exceptions, types, and subprograms that are available automatically to every PL/SQL program. For illustration, the package STANDARD declares the built-in function below named as the ABS that returns the absolute value of its argument as:

FUNCTION ABS (n NUMBER) RETURN NUMBER;

The contents of the package STANDARD are directly noticeable to the applications. Therefore, you can call the ABS from stored subprograms, database triggers, 3GL applications, and different Oracle tools.

If you re-declare the ABS in a PL/SQL program, your local declaration overrides the global declaration. Though, you can still call the built-in function by using the dot notation, as shown below:

 

... STANDARD.ABS(x) ...

Most of the built-in functions are overloaded. For illustration, the package STANDARD contains the declarations a shown below:

FUNCTION TO_CHAR (right DATE) RETURN VARCHAR2;

FUNCTION TO_CHAR (left NUMBER) RETURN VARCHAR2;

FUNCTION TO_CHAR (left DATE, right VARCHAR2) RETURN VARCHAR2;

FUNCTION TO_CHAR (left NUMBER, right VARCHAR2) RETURN VARCHAR2;

The PL/SQL solves the call to the TO_CHAR by matching the number and datatypes of the formal and real parameters.

 


Related Discussions:- Package standard in pl/sql

Delete command - sql, DELETE Command - SQL Loosely speaking, DELETE re...

DELETE Command - SQL Loosely speaking, DELETE removes some existing rows from its target table. Suppose the university decides that course C3 is to be withdrawn. Example shows

I want online credit application website, Project Description: We organi...

Project Description: We organize an online system called ACPAS we have created a project called EVO that can be use by our customers to integrate their web sites with the Acpas

Return statement, RETURN Statement The RETURN statement instantly compl...

RETURN Statement The RETURN statement instantly completes the execution of a subprogram and returns control to the caller. The Execution then resumes with the statement below t

Projection and existential quantification - sql, Projection and Existential...

Projection and Existential Quantification - SQL Intuitively it might seem that projection in SQL is simply a matter of specifying the required columns in the SELECT clause, a

Parameter and keyword description - open-for statement, Parameter and Keywo...

Parameter and Keyword Description: cursor_variable_name: This identifies a cursor variable or the parameter formerly declared within the present scope. host_cursor_va

Raise_application_error, Raise_application_error -  procedure of package D...

Raise_application_error -  procedure of package DBMS_STANDARD , allows to issue an user_defined error messages by stored sub-program or database trigger.

Triggers, At times, customers make mistakes in submitting their orders and ...

At times, customers make mistakes in submitting their orders and call to cancel the order. Brewbean’s wants to create a trigger that automatically updates the stock level of all pr

Sql outer join, SQL outer join SELECT * FROM IS_CALLED NATURAL LEFT...

SQL outer join SELECT * FROM IS_CALLED NATURAL LEFT JOIN IS_ENROLLED_ON Note that adding LEFT to an invocation of CROSS JOIN has no effect unless the right-hand operand

Fetch statement - syntax, FETCH Statement The FETCH statement retrieve ...

FETCH Statement The FETCH statement retrieve rows of data one at a time from the result set of the multi-row query. The data is stored in fields or variables which correspond t

Logical connectives - sql, Logical Connectives - SQL SQL's extended t...

Logical Connectives - SQL SQL's extended truth tables in which the symbol, for unknown, appears along with the usual T and F. Negation (NOT, ¬) Conjunction (

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd