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Creating and Destroying Base Tables:
Example shows an SQL command to create the base table counterpart of the ENROLMENT variable
Example Creating a base table.
CREATE TABLE ENROLMENT ( StudentId SID , Name VARCHAR(30), CourseId CID , PRIMARY KEY ( StudentId, CourseId ) ) ;
(Example and the other examples in this chapter all end in semicolons. Actually, a semicolon is required in SQL only in scripts consisting of more than one statement. A script consisting of a single statement must not end in a semicolon.)
i NEED THE QURIES TO SOME OF THE PROBLEMS USING plsql
Consider the following set of database tables (same tables from Assignment 6-1). Please take note of foreign keys (most of them carry the same names as the corresponding primary ke
Loop Labels Like the PL/SQL blocks, loops can also be labeled. The label, an undeclared identifier enclosed by double angle brackets, should appear at the beginning of the LOOP
BETWEEN and NOT BETWEEN Operator in SQL Example: Restricting exam marks to between 0 and 100 CREATE ASSERTION Marks_between_0_and_100 CHECK (NOT EXISTS (SELECT * FROM
Block Structure The PL/SQL is a block-structured language. That is, the fundamental units (procedures, anonymous blocks, and functions) that make up a PL/SQL program are logi
Deleting Objects You can use the DELETE statement to eradicate objects from an object table. To eradicate objects selectively, you use the WHERE clause, as shown below: BEG
Hi,am developing a library system and relating all the table is somehow complex,could you kindly assist me
What Is a Collection The collection is an ordered group of elements, all of similar type (for e.g. the grades for a class of students). Each element has a unique subscript whic
What are the rates for help in writing PL/SQL procedures and functions?
Advantages of Wrapping The PL/SQL Wrapper convert the PL/SQL source code into a transitional form of the object code. By hiding the application internals, the Wrapper secure
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