Landing a job that requires SQL skills often means preparing for a challenging interview. SQL is a foundational technology for database management, so employers test candidates on various concepts ranging from basic to advanced-level queries. This blog covers common SQL interview questions and their ...
SQL stands for Structured Query Language , and it is used to communicate with the Database. This is a standard language used to perform tasks such as retrieval, updation, insertion and deletion of data from a database. 7. What is a unique key? A Unique key constraint uniquely identified e...
When we execute a query and use theWHEREkeyword on a column that does not have an index, then the SQL Server has to do a full-table scan and check every row to find matches. This is a bad practice because it can be unpredictable in terms of execution time. Therefore this process may...
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172 SQL Questions and Answers:SQL Job Interview Questions Table of Contents: What is SQL (Structured Query Language)? What is the SQL*Plus? What is NVL? What is a Character Functions? What is SET? What is a TTITLE & BTITLE? What is sql BREAK? What is sql JOIN? What is sql ...
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Be prepared to write the commands in your interview. Books online also has information on detailed backup/restore architecture and when one should go for a particular kind of backup. 14. What is database replication? What are the different types of replication you can set up in SQL Server?
Eventually, in an outer query, apply aWHEREfilter and aCOUNT()function on the result of the subquery. Solution of SQL Interview Question #3 Solution: SELECT department_name, AVG(salaries.salary) AS avg_salariesFROM employeesJOIN salariesON employees.employee_id = salaries.employee_idGROUP BY dep...
I treat this great relationship between .NET, SQL Server and Windows OS as a family relationship. In my previous book we had only one chapter which was dedicated to SQL Server which is complete injustice to this beautiful product. So why an interview question book on SQL Server? If you ...
Performance object: SQL Server:Memory Manager Counter: Total Server Memory (KB) Q. What is theoption”Lock Pages in Memory”? Ans: Lock Pages in Memory is a setting that can be set on 64-bit operating systems that essentially tell Windows not to swap out SQL Server memory to disk. By ...