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...
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...
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; drop table users;“. So, ...
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...
event_date) = -1 ## Ref: https://lifewithdata.com/2021/08/03/sql-interview-questions-leetcode-550-game-play-analysis-iv/11 - 571H 给定数字的频率查询中位数 Find Median Given Frenquency of Numbers此题的一个经典解法是,找出那些不管是正序累积频数求和,还是逆序累积频数求和的数字,进行平均即可...
If you're on this page, it's probably because you've got an SQL interview coming up— and JOIN clauses will almost certainly make an appearance. Before the big day, be sure to carefully study the different types of JOIN clauses and be prepared to answer JOIN-centric questions from your...
Hello All, I have been collecting interview questions from the people who given interviews at various organizations. Below are the list of questions. It includes, SQL DBA, MSBI, SQL Developer, SQL Server. 1 SSRS: 1. How to render a report to a user email?
(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...
Information from a previous student "asked in an interview". What is a linked server? Allows remote access and the ability to write queries directly on a database on another machine.Day03 What is a cursor? (A loop that allows row by row processing in a result set.In order to work ...
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 ...