Tricky interview questions in oracle sql
Web2 days ago · SQL Functions are a very powerful feature of SQL. SQL functions can take arguments but always return some value.1. There are two distinct types of SQL functions: 1) Single-Row functions: These functions operate on a single row to give one result per row. Types of Single-Row functions: Character. WebMar 25, 2024 · Scalar functions are those functions which are used to return a single value based on the input. Following are the commonly used scalar functions in SQL:-. 1. UCASE () – Convert to Upper Case. 2. LCASE () – Convert to Lower Case. 3. MID () – It extracts a substring from a string.
Tricky interview questions in oracle sql
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WebMar 7, 2024 · Every interview is different and the scope of a job is different too. Keeping this in mind we have designed the most common Oracle Interview Questions and answers for 2024 to help you get success in your interview. In this article, we will cover most common 2024 Oracle Interview Questions that are mostly asked in an interview. These questions ... WebIn MySQL, you can use a simple trick like. select @i = coalesce (@i, 0) + 1 as ranked, val from tbl order by val. In Oracle, you can get by using builtin rownum: select rownum, sub.val from (select val from tbl order by val) sub. In the general case this should also work:
WebOct 3, 2024 · 1. SQL Analytic Functions VS Aggregate Functions. An Analytic function calculates an aggregate value over a group of rows and returns a single result for each row of the group. This is different from an aggregate function, which returns a single result for each group of rows. Before getting into interview questions let us try to understand the ... WebOracle PL/SQL Interview Questions for Experienced Professionals. Oracle created PL/SQL to overcome the disadvantages of SQL. It allows easier building and handling of critical applications. The following Oracle PL/ SQL interview questions for experienced professionals will help you brush up on the concepts: ...
Web#etlqalabs #sqlinterviewquestionsandanswers #etl #sqlIn this video , we'll focus and understand the TOP 10 SQL interview queries which are most important SQL...
WebJul 2, 2024 · One of the most important and basic questions asked in the interview is whether you know all the parts of a PC. Just because it is an easy question and you think there’s no way an interviewer will throw such a basic question at you, do not ignore it. The components of a PC include the following: Motherboard; Processor (CPU) Memory (RAM)
WebEvery interview is different and the scope of a job is different too. Keeping this in mind we have designed the most common Advance SQL Interview Questions and Answers to help you get success in your interview. Below is the top Advance SQL Interview Questions that are asked frequently in an interview: 1. geeky medics clottingWebOct 6, 2010 · 6. Name the two profiler tools and describe what they do. 1. The Profiler API, DBMS_PROFILER package, will compute the time a PL/SQL program spends at each line of code and within each subprogram; very handy if you’re trying to … geeky medics cnsWebDec 28, 2024 · The tricky part is that there may be duplicates, and the last line of code, the HAVING COUNT () statement, fails to consider such a scenario. Instead, we should use the DISTINCT method inside the chunk to specify the output. In fact, the question has an additional note that specifies what to do with duplicates. geeky medics cocpWeb9) What is a snapshot in Oracle database? A snapshot is a replica of a target master table from a single point-in-time. In simple words you can say, snapshot is a copy of a table on a remote database. 10) What is the difference between hot backup and cold backup in Oracle? geeky medics clubbingWebMar 19, 2024 · SQL means structured query language that is used to communicate with the database, retrieve information and manipulate data stored in the database. It is the most in demand skill that will help you throughout your career, irrespective of the changes in technology that take place every day. So if you have the passion to work … Continue … geeky medics coagulation cascadeWebMar 17, 2024 · Q #15) Explain the working of SQL Privileges. Answer: SQL GRANT and REVOKE commands are used to implement privileges in SQL multiple user environments. The administrator of the database can grant or revoke privileges to or from users of database objects by using commands like SELECT, INSERT, UPDATE, DELETE, ALL, etc. dc blazer hot topicWebAug 19, 2024 · Mastering SQL is not only essential in an interview point of view, but a good understanding of SQL by being able to solve complex queries will keep us above everyone in the race. In this article, I will talk about 5 tricky questions I found and my approaches to solve them. Note — Each query can be written in different ways. dc black owned bookstores