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Comprehensive, communitydriven list of essential sql interview questions. In this post we will discuss some basic oracle interview questions and answers. Oct 06, 2014 top sql query interview questions and answers job interview tips 1. Query optimization is the process of writing the query in a way so that it could execute quickly. Sql joins are the most important and difficult to understand,so this tutorial will help you grab a good hold on this demon. If youre looking for oracle pl sql interview questions for experienced or freshers, you are in.
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The union operator combines the result of two or more sql queries and returns the result. In oracle, monthsbetween function is used to find number of months between the given. Advanced sql queries interview questions and answers. If youre looking for oracle pl sql interview questions for experienced or freshers, you are in the right place. This is the frequently asked oracle interview questions in an interview. Top 20 sql query interview questions frequently asked. Previous post top 30 pl sql interview questions and answers for freshers. Sql query questions are very usefull for freshers to learn easly. Frequently asked oracle dba interview questions updated 2020. I generally ask below questions in interviews to understand candidates depth in sql.
Delete duplicate rows using a single statement and no table creation. This blog is the perfect guide for you to learn all the concepts related to sql, oracle, ms sql server and mysql database. Dec 29, 2011 as a database developer, writing sql queries, plsql code is part of daily life. Here coding compiler sharing a comprehensive list of 250 sql server interview questions. Jul 10, 2011 pinal dave is a sql server performance tuning expert and an independent consultant.
Make sure you subscribe and be the 1st one to see my videos. These sql queries are good to ask for freshers, or 1 to 2 years experience. What is the query to fetch first record from employee table. Refer the frequently asked oracle interview questions. Here we provide most common interview question and answers for sql and rdbms. Oracle interview questions and answers on sql queries and. Sql plus commands are used to format query result, set options, edit sql commands and pl sql. Explain your answer and also provide an alternative version of this query that will avoid the issue that it exposes. In this article on sql query interview questions, i will discuss a few queries which you must practice to become a database administrator.
Here are five typical sql interview questions, along with some tips to help you answer them effectively. Sql queries interview questions and answers youtube. A comprehensive list of sql queries frequently asked in interviews for sql server, mysql and oracle dbms that you should be practicing now. Nov 29, 2016 index join trigger performance issues rank,dense rank function 3rd highest query remove duplicate group by,partition by difference between delete and truncate. Frequently asked basic and advanced oracle database interview questions and answers on database theory and sql queries with examples for freshers and experienced. What is the difference between procedure and function. Pl sql interview questions and answers pl sql interview. Also, recently wed published a set of 20 sql interview questions on complex queries. These are really important queries which will ask in most of the interview questions. Top sql queries interview questions and answers job interview. This sql query is tricky, but you can use between clause to get all. For interview questions on sql queries, check the below links. Sql plus is an oracle specific program, which accepts and executes sql commands and pl sql.
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