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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)
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write the program for traffic control system with 10 second, 15 secod, and 20 second delay
Row Operators The Row operators return or reference the particular rows. ALL retains the duplicate rows in the result of a query or in an aggregate expression. The DISTINCT el
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