Semidifference via except and join - sql, PL-SQL Programming

Semidifference via EXCEPT and JOIN - SQL

SELECT *

FROM (SELECT StudentId

FROM IS_CALLED

WHERE Name = 'Devinder'

EXCEPT DISTINCT CORRESPONDING

SELECT StudentId

FROM IS_ENROLLED_ON

WHERE CourseId = 'C1') AS T1

NATURAL JOIN IS_CALLED

The NOT IN expression above appears to be testing for the appearance of a character string in a table, but in fact the first operand in this context is short for ROW(StudentId)

Posted Date: 1/18/2013 5:42:41 AM | Location : United States







Related Discussions:- Semidifference via except and join - sql, Assignment Help, Ask Question on Semidifference via except and join - sql, Get Answer, Expert's Help, Semidifference via except and join - sql Discussions

Write discussion on Semidifference via except and join - sql
Your posts are moderated
Related Questions
Question: (a) In the context of database security explain how the following database features help to enforce security in the database system: (i) Authorisation (ii) Access

Using Cursor Attributes To process the SQL data manipulation statements, the SQL engine must opens an implicit cursor named SQL. This cursor's attributes (%FOUND, %NOTFOUND, %

Database Values You can use the SELECT statement to have the Oracle assign values to a variable. For Each and every item in the select list, there must be a matching, type-compa

Fetching from a Cursor Variable The FETCH statement retrieve rows one at a time from the product set of a multi-row query. The syntax for the same is as shown: FETCH {curso

UPDATE Statement   The UPDATE statement transforms the values of the specified columns in one or more rows in the table or view. Syntax:

i NEED THE QURIES TO SOME OF THE PROBLEMS USING plsql

Example of ADD CONSTRAINT in SQL Example: Alternative formulation for MAX_ENROLMENTS ALTER TABLE IS_ENROLLED_ON ADD CONSTRAINT MAX_ENROLMENTS CHECK ((SELECT COUNT (*)

Advantages of PL/SQL The PL/SQL is a high-performance transaction processing, completely portable language that offers the following advantages as shown: 1) Support for SQL

Keyword and Parameter Description: boolean_expression: This is an expression which results the Boolean value TRUE, FALSE, & NULL. It is related with a series of statement

%ROWCOUNT When its cursor or cursor variable is opened, the %ROWCOUNT is zeroed. Before the first fetch, the %ROWCOUNT yields 0. Afterward, it yields the number of rows fetche