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Count Operator in SQL
Example: Counting the students who have scored more than 50 in some exam
(SELECT COUNT (*) FROM
(SELECT DISTINCT StudentId
FROM EXAM_MARK
WHERE Mark > 50) AS T)
Example is a direct translation of the corresponding example in the theory book but it can be abbreviated-and is much more likely to be written-as
(SELECT COUNT (DISTINCT StudentId )
WHERE Mark > 50)
Accessing Attributes: You can refer to an attribute only by its name not by its position in the object type. To access or modify the value of an attribute, you can use the dot
Hi,am developing a library system and relating all the table is somehow complex,could you kindly assist me
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Semijoin and Composition - SQL For semijoin, the dyadic relational operator MATCHING, defined thus: r1 MATCHING r2, where r1 and r2 are relations such that r1 JOIN r2 is de
Name Resolution In potentially uncertain SQL statements, the names of the database columns take precedence over the names of the local variables and formal parameters. For e.g.
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Relational Operators The relational operators permit you to compare randomly complex expressions. The list below provides the meaning of each operator:
Dynamic Ranges The PL/SQL lets you determine the loop range dynamically at run time, as the example below shows: SELECT COUNT(empno) INTO emp_count FROM emp; FOR i IN 1..emp_cou
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