Example of wrap operator - sql, PL-SQL Programming

Assignment Help:

Example of WRAP Operator - SQL

The effect of Example can be obtained in SQL but note that one needs to write down not only the names of the columns being wrapped but also the names and declared types of the columns not being wrapped.

Example: Collecting column values together

SELECT Name, Phone, Email,

CAST (ROW (House, Street, City, Zip) AS

ROW (House VARCHAR (100), Street VARCHAR (100),

City VARCHAR (100), Zip VARCHAR (10)))

AS Address

FROM CONTACT_INFO

As before, we need to use CAST because the result of an invocation of ROW has unnamed fields. The example assumes, therefore, a definition such as the following for the base table CONTACT_INFO:

CREATE TABLE CONTACT_INFO (Name VARCHAR (100) PRIMARY KEY,

Phone VARCHAR (15) NOT NULL,

Email VARCHAR (50) NOT NULL,

House VARCHAR (100) NOT NULL,

Street VARCHAR (100) NOT NULL,

City VARCHAR (100) NOT NULL,

Zip VARCHAR (10) NOT NULL,);

SQL has no shorthand similar neither to WRAP, nor for UNWRAP.

Related Discussions:- Example of wrap operator - sql

Aggregate assignment-declarations in sql, Aggregate Assignment The %ROWT...

Aggregate Assignment The %ROWTYPE declaration cannot include an initialization clause. Though, there are two ways to assign values to all fields in a record at once. At First, t

Sql, If two relations R and S are joined, then the non matching tuples of b...

If two relations R and S are joined, then the non matching tuples of both R and S are ignored in __________________.

%found - explicit cursor attributes, %FOUND Subsequent to a cursor or ...

%FOUND Subsequent to a cursor or cursor variable is opened but before the first fetch, the %FOUND yields NULL. Afterward, it yields TRUE when the last fetch returned a row, or

Closest approximation to relational union - sql, Closest Approximation to R...

Closest Approximation to Relational Union - SQL Actually, just as SQL has several varieties of JOIN, it also has several varieties of UNION, none of which is equivalent to th

Using operator value in pl sql, Using Operator VALUE: As you may expec...

Using Operator VALUE: As you may expect, the operator VALUE returns the value of an object. The VALUE takes its argument a correlation variable. For illustration, to return a

Remote operations in pl sql, Remote Operations: As the illustration sh...

Remote Operations: As the illustration shows below, the PL/SQL subprograms can execute the dynamic SQL statements which refer to the objects on a remote database: PROCEDURE

Table represents an extension - sql, Table Represents an Extension - SQL ...

Table Represents an Extension - SQL It describes how each tuple in a relation represents a true instantiation of some predicate and each true instantiation is represented by s

Select query, Query: SELECT * FROM EMPLOYEE1; Select 5 columns and ...

Query: SELECT * FROM EMPLOYEE1; Select 5 columns and all rows from one table Query: SELECT C_ID, COMPANY, BUILDING, DEPARTMENT, BRANCH FROM CONTRACT;

In mode - parameter modes, IN Mode An IN parameter pass the values to ...

IN Mode An IN parameter pass the values to the subprogram being called. Within the subprogram, an IN parameter acts like a constant. And hence, it cannot be assigned a value.

Bulk binds advantages, Bulk Binds advantages In the Embedded Oracle RDB...

Bulk Binds advantages In the Embedded Oracle RDBMS, the PL/SQL engines accept any valid PL/SQL subprogram or block. As the figure shows, the PL/SQL engine executes all procedur

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages