SQL Interview Questions PDF

SQL Interview Questions PDF: Comprehensive Resource for Database Job Seekers

Welcome to our blog post, where we are delighted to present you with the “SQL Interview Questions PDF.” If you’re preparing for a job interview in the field of database management or data analysis, having a solid understanding of SQL (Structured Query Language) is essential. This PDF guide is designed to equip you with a comprehensive collection of SQL interview questions and answers, providing you with the confidence and knowledge to excel in your upcoming SQL-related interviews.

In this PDF, we introduce you to the “SQL Interview Questions PDF” – a valuable resource that covers a wide range of SQL interview topics, including database concepts, query optimization, data manipulation, and more. Whether you’re a fresh graduate, a seasoned professional, or someone looking to enhance their SQL expertise, this guide will serve as an invaluable tool to prepare for your SQL-focused job interviews.

Why “SQL Interview Questions PDF”?

Job interviews can be nerve-wracking, especially when faced with technical questions related to SQL. Being well-prepared and having a solid understanding of SQL concepts can significantly boost your chances of success. Our “SQL Interview Questions PDF” aims to support you in your interview preparation by providing a comprehensive collection of commonly asked SQL interview questions, along with detailed answers and explanations. This guide will help you gain confidence, showcase your SQL knowledge, and stand out among other candidates.

SQL Interview Questions Table of Contents

Core SQL Concepts

1. What is Relational Database Management System (RDBMS)?
2. What is Structured Query Language?
3. What is a Database?
4. What is primary key?
5. What is a unique key?
6. What is a foreign key?
7. Explain the difference between spreadsheets and databases.
8. What are table and fields?
9. Explain the various SQL languages.
10. What is normalization?
11. What is denormalization?
12. Explain the different types of normalization.
13. What are views in SQL?
14. What is join? Explain the different types.
15. What are the different types of indexes?
16. What is a cursor in SQL?
17. What is query?
18. What is a subquery?
19. What is a trigger?
20. Differentiate between the DELETE and TRUNCATE commands.
21. What are local and global variables?
22. What are constraints?
23. What is data integrity?
24. What is auto increment?
25. What is a data warehouse?
26. What is the difference between DROP and TRUNCATE statements?
27. What are aggregate and scalar functions?
28. What is alias in SQL?
29. What is the difference between OLTP and OLAP?
30. What is collation? What are the various types of collation sensitivity?
31. How can we create tables in SQL?
32. How can we insert data in SQL?
33. How can we change a table name in SQL?
34. What is SQL server?
35. What is ETL in SQL?
36. What are nested queries?
37. What is the difference between CHAR and VARCHAR2 data types in SQL server?
38. What is difference between SQL and PL/SQL?
39. What is the difference between SQL and MySQL?
40. What is cross join?
41. What are user defined functions?
42. What is a CLAUSE?
43. What is recursive stored procedure?
44. Explain UNION, MINUS and INTERACT commands?
45. What TCP/IP port does SQL Server run?
46. Which operator is used in query for pattern matching?
47. How can we select unique records from a Table?
48. List and explain each of the ACID properties that collectively guarantee that database transactions are processed reliably.
49. What is the main difference in the BETWEEN and IN condition operators?
50. What are SQL functions used for?
51. What is the need for MERGE statement?
52. List the ways in which dynamic SQL can be executed.
53. List some case manipulation functions in SQL.
54. Is semicolon used after sql? Justify why or why not.
55. What is candidate key?
56. What is the difference between JOIN and UNION?
57. What is the difference between order and group by?
58. Write an SQL query to fetch employee names having a salary greater than or equal to 20000 and less than or equal to 10000.
59. What is SQL injection? When does SQL injection occur?
60. What is ENUM?
61. What is the difference between the ATAN and ATAN2 function?
62. What is the difference between the CEIL, FLOOR and ROUND functions?
63. What is the RAND() function?
64. What is the difference between LOCALTIMESTAMP and CURRENT_TIMESTAMP?
65. Name three functions that specify current date and time.
66. Which function returns the difference between two periods? What would the format of the output be?
67. How can we fetch common records from two tables?
68. How can we fetch alternate records from a table?
69. How can we select unique records from a table?
70. What is the command used to fetch the first 5 characters of the string?
71. How to use LIKE in SQL?
72. How can we copy a table in SQL?
73. If we drop a table, does it also drop related objects?
74. What is Live Lock?
75. Can you join a table by itself?
76. Explain Equi join with an example.
77. Explain non-Equi join with an example.
78. State the difference between NVL and NVL2 functions.
79. What does this query achieve? GRANT privilege_name ON object_name TO {user_name|PUBLIC|role_name} [WITH GRANT OPTION]; ?
80. Where is MyISAM table stored?
81. What does myisamchk do?
82. How can we store videos inside SQL server table?
83. Write an SQL query to show the second highest salary from a table.
84. How would you select all the users whose phone number is NULL?
85. Write an SQL query to fetch three max salaries from a table.
86. Write an SQL query to create a new table with data and structure copied from another table.
87. What are the differences between the HAVING clause, and the WHERE clause?
88. What does a BCP command do?
89. Can a view be active if the base table is dropped?
90. When should we use NoSQL and SQL?
91. What is SYSTEM privilege?
92. What are object privileges?
93. Does the data stored in the stored procedure increase access time or execution time? Explain.
94. What is CTE?
95. Does view contain data?
96. Define a temp table.
97. What is the difference between the RANK() and DENSE_RANK() function?
98. What is referential integrity?
99. What does query optimization imply?
100. What are nested triggers?
101. What is schema in SQL server?
102. Write a query to fetch 50% records from an EmployeeInfo table.
103. Write a query to add email validation to your database.
104. What is CTE in SQL server?
105. Suppose you have a sample table of workers, bonus and title.
106. Write a query to fetch the top N records.

Conclusion:

With our “SQL Interview Questions PDF,” you’ll have a comprehensive resource that covers a wide range of SQL interview topics, enabling you to prepare effectively and confidently for your upcoming interviews. This guide will equip you with the knowledge, answers, and explanations to tackle SQL-related interview questions, impress interviewers, and secure your dream job in the field of database management or data analysis.

Stay tuned as we unveil this essential resource that will simplify your SQL interview preparation. Get ready to ace your SQL interviews with our “SQL Interview Questions PDF.”

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