Scenario-Based SQL Interview Questions The Bottom Line Top SQL Interview Questions List for 2025 SQL is a common language for Structured Query Language, which is based on general English, whereas MySQL is a database management system. Structured Query Language is the main part of the relational d...
Clustered Index. This type of index reorders the physical order of the table and search based on the key values. Each table can have only one clustered index. NonClustered Index. NonClustered Index does not alter the physical order of the table and maintains logical order of data. Each tabl...
Non-Equijoin returns rows from two or more tables based upon a relationship other than the equality condition in the WHERE clause.Outer Join combines two or more tables returning those rows from one table that have no direct match in the other table.Self Join joins a table to itself as ...
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. So we can use a where clause w...
The SQL Joins refer to combining rows from two or more tables based on a related column between them. Various types of Joins can be used to retrieve related data, and it depends on the relationship between tables. There are four types of Joins: ...
We can’t create a new database when model database is down. SQL Server restart will be unsuccessful when model database is down as TEMPDB creation failed. TEMPDB is created based on model DB configurations, since model DB is down TEMPDB will not be created. ...
Conditional Statements:These includeIFandCASEstatements, which execute different blocks of code based on conditions.TheDECODE() functionis another good example of a conditional that is worth studying. Intermediate PL/SQL Interview Questions Having covered the basic questions, now let's move on to some...
16. What are the new features introduced in SQL Server 2000 (or the latest release of SQL Server at the time of your interview)? What changed between the previous version of SQL Server and the current version? This question is generally asked to see how current is your knowledge. Generally...
(Note: I created this test question based on a real SQL interview question that I heard from a friend, who applied at one of the biggest social media companies (name starts with ‘F.’ ;)) Solution of SQL Interview Question #1 The solution code is: SELECT authors.author_name, SUM(books...
19.What is cost based optimizer? Answer: Cost Based Optimizer (CBO) uses the artificial intelligence to execute the Query. The Optimizer itself decides the execution plan based on the cost of query. The cost based method means the database must decide which query execution plan to choose. It...