There are 22,000 job openings around the world, and it is an important skill for data analysts, database administrators, developers, and BI professionals. Through this set of interview questions, you will come across multiple tricky SQL queries for the interview. You will be equipped with top...
Tricky SQL interview questions are an important part of the recruitment process. These queries for interview rounds go beyond assessing candidates on basic knowledge of SQL and require them to think beyond theory. These questions are designed to evaluate the proficiency of candidates in the practical ...
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 ...
Following are some important Interview Questions for SQL : 1.What is SQL?Where SQL is used? Answer: SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in relational database.SQL can be used in different languages or database manag...
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.
For the following statements, PL/SQL employs implicit cursors INSERT UPDATE DELETE SELECT ( queries that return exactly one row) Q #8) When do we use triggers? Answer:The word ‘Trigger’ means to activate. In PL/SQL, the trigger is a stored procedure that defines an action taken by the...
12.What is Bit-map index?Explain with Example.(80 % Asked in PL SQL Interview Questions) Answer: 1.If Table contains the distinct values which are not more than 20 distinct values then user should go for Bit map indexes. 2.User should avoid the indexing on each and every row and do ...
optimizing the SQL queries above might seem insignificant due to their scale(ms). But as the amount of data you work with grows, these milliseconds will increase to seconds, minutes, and possibly even hours. You’ll realize then that these SQL query optimization techniques are highly important....
For more information, see the article:Maintaining SQL Server indexes. Q24: How can you find the missing indexes that are needed to potentially improve the performance of your queries? TheMissing Index Detailsoption in the query execution plan, if available. ...
SQL is an important tool in a number of careers. Our expert lays out some of the most common questions you can expect in an SQL interview.