#Adventureworks database practice problems how to
Question 32 : How to convert the System time in to seconds in oracle? This article gives you the idea about Complex SQL Queries examples and will be useful to all the programmers. Hope This article named Complex SQL queries examples is useful to all the programmers. Select FIRST_NAME, to_char(joining_date,’YYYY’) JoinYear, to_char(joining_date,’Mon’), to_char(joining_date,’dd’) from EMPLOYEES
Select rollno, count (rollno) from Studentģ1.How to Find the Joining date of Employee in YYYY-DAY-Date format. (Select max (rowid) from Student b where rollno=b.rollno) ģ0.How to find count of duplicate rows? (95% asked in SQL queries for Interviews ) SELECT lpad (‘*’, ROWNUM,’*’) FROM Student WHERE ROWNUM
We cannot use dual table to display output given above. Select distinct salary from employee a where 3 >= (select count(distinct salary) from employee b where a.salary 10000 Select * from Employee where Rownum = N_ROWSĨ.How to get 3 Highest salaries records from Employee table? Select * from Employee where Rowid= select max(Rowid) from Employee Complex SQL QueriesĬlick here to get 20 interview questions on Perforance Tuning.Ħ.What is Query to display first 5 Records from Employee table?(90% asked Complex SQL Queries Examples) Select * from Employee where Rowid= select min(Rowid) from Employee ĥ.What is the Query to fetch last record from the table? Am I missing something? I spent this seemingly easy question too much time and it's getting frustrating.Select Employee_name,Salary/12 as ‘Monthly Salary’ from employee Ĥ.What is the Query to fetch first record from Employee table? (90% asked Complex SQL Queries Examples) SELECT FirstName, EmailAddressFROM CustomerWHERE CompanyName = 'Bike World' Īnd this is not correct. I google the questions, and it seems like people are using a different database, as most of the answer to this question was: It's mainly aimed at Ruby on Rails developers, but we think it could definitely be a useful learning tool for backend engineers and SQL folks in general. Show the first name and the email address of the customer with CompanyName 'Bike World'Īnd it seems easy, the tables look like this:īut here what I don't understand is that: The CustomerID key in the individual table, and the CustomerID key in the customer table, do not match. In this article, we lay out table partitioning in PostgreSQL databases and also explore common problems and pitfalls.So I recently downloaded the Adventure Works database for MySQL version, and I'm solving problems on, and I have a huge problem on the first easy question. Thanks to -sniff- for the awesome header image! You should post these to /r/learnsql instead. Note /r/SQL does not allow links to basic tutorials to be posted here. Please view the Wiki for online resources. Learning SQLĪ common question is how to learn SQL. SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field.3įor those with SQL questions we recommend using SQLFiddle to provide a useful development and testing environment for those who wish to fully understand your problem and help devise a solution.
#Adventureworks database practice problems code
Something as simple as line breaks and using reddit's built in code formatting (4 spaces at the start of each line) can turn this: This will greatly increase your chances of receiving the help you desire. If you are including actual code in a post or comment, please attempt to format it in a way that is readable for other users. We will gladly help where we can as long as you post the work you have already done or show that you have attempted to figure it out on your own. If you are a student or just looking for help on your code please do not just post your questions and expect the community to do all the work for you. While naturally we should endeavor to work as platform neutrally as possible many questions and answers require tailoring to the feature set of a specific platform. When requesting help or asking questions please prefix your title with the SQL variant/platform you are using within square brackets like so: The goal of /r/SQL is to provide a place for interesting and informative SQL content and discussions.
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