The use of comparison operators like <,> or = can be done in a subquery. These kinds ofSQL Interview Questionsare a bit difficult to understand and answer accordingly. There are a lot ofSQL Interview Questionsapart from this, which the candidates must practice qualifying for the interview. Fo...
Database lock tell a transaction, if the data item in questions is currently being used by other transactions. SQL INTERVIEW QUESTIONS AND ANSWERS 10 | P a g e What are the type of locks ? Shared Lock When a shared lock is applied on data item, other transactions can only read the ite...
31. What is SQL Injection? SQL injection is a hacking technique that is widely used by hackers to steal data from databases. Let’s say we go to a website and we want to log in. We insert our username and password, and then add some malicious code over there such that: “username;...
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...
SQL DBA Interview Questions with Answers Q. What are the common issues a SQL DBA should deal with as a part of DBA daily job? Ans: Backup Failure Restore Failure Log Full Issues Blocking Alerts Deadlocks Alerts TEMPDB full issues Disk Full Issues ...
If you've got an SQL interview coming up, you'll almost certainly be asked about JOIN clauses. Make sure you're prepared by practicing these 5 tough questions on JOINs in advance.
SQL Server Interview Questions and Answers – Part 2 What is the difference between clustered and a non-clustered index? Aclustered indexis a special type of index that reorders the way records in the table are physically stored. Therefore table can have only one clustered index. The leaf ...
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 ...
1NF: Eliminate Repeating Groups Make a separate table for each set of related attributes, and give each table a primary key. Each field contains at most one value from its attribute domain. 2NF: Eliminate Redundant Data If an attribute depends on only part of a multi-valued key, remove it...
(And hey, these are “sample” SQL interview questions but they are heavily based on reality!) Before the tasks – What can you expect in an SQL technical screening? There are two common ways an SQL tech screening can be done. The simpler but less common way is that you get a ...