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SQL Interview Question 面试的时候发现会问一些SQL的基本问题,在此总结一下。 ProgramInterview/SQL这个网站上的问题还比较全。 1. Join type INNER JOIN: Returns all rows when there is at least one match in BOTH tables LEFT JOIN: Return all rows from the left table, and the matched rows from the...
3) A lot of operators are available in SQL. What are the various operators in SQL? These kinds ofSQL interview questionsconfuse the candidate at times. So, coming to the question, there are three different kinds of operators available in SQL. They are: Arithmetical operators Logical operators ...
All these types uses a separate algorithm that is best suited to queries. Q20. How to start PostgreSQL on Windows? Answer You can use pg_ctl -D "C:\Program Files\PostgreSQL\9.6\data" start to start PostgreSQL on Windows. Q21. How to stop PostgreSQL on Windows? Answer First, you want...
To prepare for this question, think about the following: Have you used SQL at your jobs in the past? With which databases did you interact? Were you primarily responsible for modifying databases using INSERT and UPDATE queries, or did you mainly query databases using SELECT? How were the data...
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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 ...
Functions, on the other hand, return a value after performing operations. They are suitable for calculations or data retrieval that need to return a result. The function below simplifies fetching an employee's salary, making it reusable in SQL queries or other procedures. ...
SQL Server Agent: Tool for scheduling and automating database tasks. Indexes: Technique for improving the performance of database queries. Stored Procedures: Predefined SQL queries are stored in the database for quick execution. Views: Virtual tables representing the result of a SQL query, simplifyi...
Eventually, in an outer query, apply a WHERE filter and a COUNT() function on the result of the subquery. Solution of SQL Interview Question #3 Solution: SELECT department_name, AVG(salaries.salary) AS avg_salaries FROM employees JOIN salaries ON employees.employee_id = salaries.employee_id ...