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 […]

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 – Restricting and Sorting Data The essential capabilities of SELECT statement are Selection, Projection and Joining. Displaying specific columns from a table is known as a project operation. We will now focus on displaying specific rows of output. This is known as a select operation. Specific rows can be selected by adding a WHERE […]