SQL – Using the Group Functions Questions 1. Which of the following is NOT a GROUP BY function? MAX MIN NVL AVG Answer: C. NVL is a general function used to provide alternate value to the NULL values. The functions MAX, MIN and AVG can be used as GROUP BY functions. 2. Which of the […]
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SQL – The SQL SELECT Statement Questions 1. Identify the capabilities of SELECT statement. Projection Selection Data Control Transaction Answer: A, B. The SELECT statement can be used for selection, projection and joining. 2. Determine the capability of the SELECT statement demonstrated in the given query. SELECT e.ename, d.dname FROM emp e, dept d WHERE […]
SQL – Creating Other Schema Objects Apart from tables, other essential schema objects are view, sequences,indexes and synonyms.A view is a logical or virtual table. Synonyms are simply alias names for database objects.Synonyms also simplify query writing and provide an element of system security by disguising the actual name of a database object.Sequences are special […]