In recent years, SQL (Structured Query Language) has emerged as one of the most important subjects in competitive examinations related to Information Technology, Computer Science, Banking IT, and government technical recruitment. Experts believe that the increasing dependence on data management systems has made SQL knowledge essential for students and job aspirants.
Educational institutions and coaching centers across India are now giving special attention to SQL preparation. Questions related to database creation, data retrieval, joins, normalization, primary keys, foreign keys, and SQL queries are frequently appearing in exams such as SSC Scientific Assistant, Banking IT Officer, NIELIT, Railway technical posts, and various state-level computer operator examinations.
According to academic professionals, SQL is considered a scoring subject because most questions are logic-based and directly related to database operations. Candidates who practice SQL commands regularly can solve examination questions quickly and accurately.
Total Questions : 20
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Question : Which key uniquely identifies each row in a table?
Question : A foreign key is mainly used to:
Question : Which key cannot contain NULL values?
Question : Which key can be made using multiple columns?
Question : Which statement is true for Unique Key?
Question : A candidate key not selected as primary key is called:
Question : Which key maintains referential integrity?
Question : How many primary keys can a table have?
Question : Which key may contain NULL values?
Question : Which SQL command creates a primary key?
Question : What is the main purpose of a primary key?
Question : Which key references a primary key in another table?
Question : Which key is formed by combining two or more columns?
Question : Which of the following can be an alternate key?
Question : Which SQL constraint prevents duplicate values?
Question : Which key helps establish parent-child relationship?
Question : Which key is automatically indexed in most DBMS?
Question : Which of the following is true about composite key?
Question : Which constraint is used to define foreign key?
Question : Which key ensures entity integrity?