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SQL Interview Questions & Answers · IT Interview Practice
Home
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Database
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SQL
Database
SQL
Relational database querying: joins, indexes and transactions.
30
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updated weekly
Junior
10
Middle
12
Senior
8
SQL questions
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What is SQL and what is it used for?
Junior
#Database
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How does NULL behave in SQL?
Junior
#Database
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What are primary keys and foreign keys?
Middle
#Database
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What database constraints are there?
Middle
#Database
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What is database normalization?
Middle
#Database
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What are transactions and ACID properties?
Middle
#Database
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What are views and materialized views?
Middle
#Database
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What are transaction isolation levels?
Senior
#Database
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What causes deadlocks and how do you prevent them?
Senior
#Database
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What are stored procedures and when should you use them?
Senior
#Database
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What are DDL, DML, DCL and TCL?
Senior
#Database
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What are common SQL data types and how do you choose them?
Middle
#Database
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