The objective of today’s article is to help you prepare for an Interview or test the knowledge you gain in your learning of SQL language. It covers the basic knowledge and advanced knowledge of SQL language and common scenario-based Interview questions that the Interviewer may expect you to a...
This is majorly used in the scenario where individual columns or groups of columns cannot be used as primary keys. For Example,: CREATE TABLE Employee ( Employee_id INT NOT NULL AUTO_INCREMENT, Employee_name VARCHAR(255) NOT NULL, Employee_designation VARCHAR(255), Age INT, PRIMARY KEY (...
The interviewer will count on you to provide an in-depth response to one of the most typical spark interview questions. Spark applications function as separate processes under the control of the driver program's SparkSession object. One task is given to each partition of the worker nodes by th...
Learn how to master SQL joins for your next interview with our Sql Joins Interview Questions Scenario Based blog.ConclusionAs we’ve learned, the self join SQL is a significant subset of the join. We’ve seen examples of self join applications ranging from processing a hierarchy in a data...
Remember no one knows everything, you are asked scenario based questions to check how you are reacting and using your analysis to get the answer. Never ever blame your previous / current work place or colleagues Do not reveal previous clients information Ex: You can say I worked with world’...
SQL INTERVIEW QUESTIONS AND ANSWERS 3 | P a g e 3.What is the difference between the “DELETE” and “TRUNCATE” commands? The DELETE command is used to remove rows from a table based on a WHERE condition whereas TRUNCATE removes all rows from a table. ...
In this article, we will discuss a number of questions that you may be asked when applying to a junior SQL Server database administrator position.
This scenario can be better implemented by logging all the necessary data into a separate table, and have a job which periodically checks this table and does the needful. 24. What is a self join? Explain it with an example Self join is just like any other join, except that two instances...
30) In what scenario you can modify a column in a table? During modifying a column: You can increase the width or precision of a numeric column. You can increase the width of numeric or character columns. You can decrease the width of a column only if the column contains null values or...
Real Life Scenario: Kindly consider following table.We need to find aggregate results departmentwise in form of rows. Employee table: Employee_numEmployee_nameDepartment IDSalary 1Amit100680000 2Rohan100550000 3Rohit101430000 Query used: select Department_ID,listagg(Employee_name,’,’) within group(...