Top-30 SQL questions in 2020 interviews that you should know

Top-30 SQL questions in 2020 interviews that you should know

WHAT IS THE DIFFERENCE BETWEEN DELETE AND TRUNCATE OPERATORS?

WHAT ARE THE SUBSETS OF SQL?

WHAT IS MEANT BY DBMS? WHAT TYPES OF DBMS DO EXIST?

WHAT IS MEANT BY TABLE AND FIELD IN SQL?

WHAT ARE SQL CONNECTIONS?

WHAT IS THE DIFFERENCE BETWEEN THE CHAR AND VARCHAR DATA TYPE IN SQL?

WHAT IS A PRIMARY KEY?

WHAT ARE CONSTRAINTS?

WHAT IS THE DIFFERENCE BETWEEN SQL AND MYSQL?

WHAT IS A UNIQUE KEY?

WHAT IS A FOREIGN KEY?

WHAT IS MEANT BY DATA INTEGRITY?

WHAT IS THE DIFFERENCE BETWEEN CLUSTERED AND NON-CLUSTERED INDICES IN SQL?

WRITE AN SQL QUERY TO DISPLAY THE CURRENT DATE

LIST THE CONNECTION TYPES

WHAT DO YOU MEAN BY DENORMALIZATION?

WHAT ARE ENTITIES AND RELATIONSHIPS?

WHAT IS AN INDEX?

DESCRIBE THE DIFFERENT TYPES OF INDEXES

WHAT IS NORMALIZATION AND WHAT ARE ITS ADVANTAGES?

WHAT IS THE DIFFERENCE BETWEEN DROP AND TRUNCATE COMMANDS?

EXPLAIN THE DIFFERENT TYPES OF NORMALIZATION

WHAT IS THE ACID PROPERTY IN THE DATABASE?

WHAT DO YOU MEAN BY “TRIGGER” IN SQL?

WHICH OPERATORS ARE AVAILABLE IN SQL?

DO THE VALUES OF NULL MATCH THE VALUES OF ZERO OR SPACE?

WHAT IS THE DIFFERENCE BETWEEN A CROSS JOIN AND A NATURAL JOIN?

WHAT IS A SUBQUERY IN SQL?

WHAT ARE THE TYPES OF SUBQUERIES?

LIST THE WAYS TO GET THE NUMBER OF RECORDS IN A TABLE?

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We conduct reviews, guides and comparative tests of gaming laptops, monitors, graphics cards, keyboards, mouses, headsets and chairs to help you buy the best ga

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