Here, we share the basic and advanced SQL queries asked in interview questions. Our tutorials explain the SQL syntax and commands in a super easy way.
Database queries are usually simple, require sub-second response times, and return relatively few records. Here is an insight into the working of an OLTP system [ Note - The figure is not important for interviews ] -Advance your career with Mock Assessments Real-world coding challenges for ...
SQL knowledge is essential for the majority of services. There are a lot of important questions for which the candidates need to be prepared while going for an interview. TheSQL Interview Questionsare very important for getting a job. One must answer the SQL Interview Questions to qualify for ...
UNION: Union operation combines results from two queries, and removes duplicates. MINUS: Minus operation returns rows from the first query that are not in the second query. INTERSECT: Intersect returns rows that are common to both queries. 16. What is a subquery? A subquery is a query nested...
Understanding query execution plans is one of the first steps to properly tuning SQL queries. So, what is a query execution plan – also known as an explain plan? Well, a query execution plan lists all the details of how that particular RDBMS plans on processing a particular query. Inside ...
The questions and answers are covered using every detail possible and they also contain queries as and where necessary. This ensures that you learn every bit of it and be well-prepared for the interview. To begin with, we will cover the basic concepts about SQL. Further, we will move towar...
Frequently asked SQL Server Interview Questions and Answers for freshers, intermediate, and experienced which will definitely ace your SQL Server Interview.
13. What are all the different normalizations? The normal forms can be divided into 5 forms, and they are explained below -. First Normal Form (1NF):. This should remove all the duplicate columns from the table. Creation of tables for the related data and identification of unique columns....
means. The SQL queries which are used the advanced functionalities to add business logic in the program or to retrieve the specific business related data are called as advanced SQL queries.You can able to learn thecomplex SQL queries,Complex SQL interview questionsand many more things in the ...
The join keyword queries entries from multiple tables. It is used with different keys to find these entries and is conscious on the link between fields. Inner Join: Returns rows which are common between the tables Right Join: Returns rows of the right-hand side table, including the common ro...