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MAX and MIN operator in SQL
Example:
(SELECT MAX (Mark) FROM EXAM_MARK WHERE StudentId = 'S1')
(SELECT MIN (Mark) FROM EXAM_MARK WHERE StudentId = 'S1')
Example needs no further explanation. SQL also has AVG for averages. Its counterparts aggregate AND and OR are spelled, respectively, EVERY and either SOME or ANY, but all of these must be used with care because of the consequences of the aforementioned general rule concerning the treatment of NULL. For example, if the condition c evaluates to UNKNOWN for every row of table t, or t is empty, then (SELECT EVERY(c) FROM t) evaluates to UNKNOWN, whereas when t is empty it really ought to evaluate to TRUE.
Using DELETE This process has three forms. The DELETE removes all elements from the collection. DELETE(n) removes the nth element from the nested table. When n is null, then D
Data Types in SQL - Integer INTEGER or synonymously INT, for integers within a certain range. SQL additionally has types SMALLINT and BIGINT for certain ranges of integers. T
Project Description: I want to write some SQL statements. The things I need are between pages 5-7. The only problem is that i want it till tomorrow. Skills required is SQL
User-Defined Exceptions The PL/SQL defines the exceptions of your own. Dissimilar to the predefined exceptions, the user-defined exceptions should be declared and should be rai
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
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Write a stored procedure that accepts the post code in which the customer resides as the input parameter. The procedure should then use an explicit cursor to display comprehensive
Adding Table Constraints ALTER TABLE ENROLMENT ADD CONSTRAINT NameNotNull CHECK (Name IS NOT NULL) ; ALTER TABLE ENROLMENT ADD CONSTRAINT PK_StudentId_CourseId PRIM
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