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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.
Functions The function is a subprogram that calculates a value. The Functions and procedures are structured similar, except that the functions have a RETURN clause. You can
IF Statement The IF statement executes a series of statement conditionally. Whether the series is executed or not depends on the value of the Boolean expression. Syntax:
SQL Operators The PL/SQL uses all the SQL set, comparison, and row operators in the SQL statements. This part briefly describes some of these operators. 1. Comparison Opera
WHILE-LOOP The WHILE-LOOP statement relates a condition with the series of statements enclosed by the keywords LOOP and END LOOP, as shown: WHILE condition LOOP sequence_of_sta
Tautologies: Above given table allows us to read the truth of the connectives in the next manner. Just expect we are looking at row three. It means this says that, if there P
Explicit Cursors The set of rows returned by the query can include zero, one, or multiple rows, depending on how many rows meet your search criteria. Whenever a query returns
Short-Circuit Evaluation When computing a logical expression, the PL/SQL uses short-circuit evaluation. That is, the PL/SQL stops computing the expression as soon as the result
Example of GROUP BY and COLLECT Operator Example: Using GROUP BY and COLLECT to obtain C_ER2 SELECT CourseId, CAST ( COLLECT (ROW (StudentId, Mark)) AS ROW (Studen
i NEED THE QURIES TO SOME OF THE PROBLEMS USING plsql
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
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