Most Popular Database Queries For an Interview

Most Popular Database Queries For an Interview

Hi Programmers, Do you want to apply at Google, Amazon, Microsoft, Facebook, Apple or any big MNC company? If yes, then must go through below...
Customers Who Never Order

Customers Who Never Order

Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never...
Delete Duplicate Emails

Delete Duplicate Emails

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallestId. For example, after running...
Rising Temprature

Rising Temperature

Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. For example, return the following...
Department Highest Salary

Department Highest Salary

The Employee table holds all employees. Every employee has an Id, a salary, and there is also a column for the department Id. The Department table holds all departments...
Swap Sex Fields

Swap Sex Field

Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f...
Combine Two Tables

Combine Two Tables

Table: Person Table: Address Write a SQL query for a report that provides the following information for each person in the Person table, regardless if there is an...
Nth Highest Salary

Nth Highest Salary

Write a SQL query to get the nth highest salary from the Employee table. For example, given the above Employee table, the nth highest salary where n = 2 is 200. If there is...

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