Monday, April 19, 2021
More
    Home Database

    Database

    Best NoSQL Databases 2021 – Most Popular among Programmers

    A database is a collection of information that is organized so that it can be easily accessed, managed and updated. Before starting with the most popular...

    Top 10 Databases You Should Learn in 2020

    A database is must need for any software development and which database to choose is one of the main requirement for software architecture. In...

    Most Popular Database Queries For an Interview

    Hi Programmers, In this article, we discuss most Popular Database Queries For an Interview. Do you want to apply at Google, Amazon, Microsoft, Facebook, Apple...

    Customers Who Never Order

    Suppose that a website contains two tables, the tableCustomers and the tableOrders. Write a SQL query to find all customers who never order anything. Table:...

    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. +----+------------------+ | Id | Email...

    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. +---------+------------+------------------+ | Id(INT) | Date(DATE) |...

    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. +----+-------+--------+--------------+ | Id | Name...

    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

    Table: Person +-------------+---------+ | Column Name | Type | +-------------+---------+ | PersonId | int | | FirstName |...

    Must Read