Tag: sql server
PreambleMongoDB has a removal method to remove documents:db.users.remove({name : "Tom"})The remove() method returns the WriteResult object. If one document is deleted successfully, the result is the...
When switching from MS SQL to MySQL, apart from data migration, you must also transfer the application code, which is in the database.Earlier we discussed how to move MS SQL to a MySQL...
MongoDB Database - Having installed the DB, we can now add data to it. All data is stored in the DB in the BSON format, which is close to JSON, so we also need to enter data in this...
When you start working with MongoDB Database, the first thing you need to do is to install the database we need as a current database in order to use it later.To do this, use the use command...
To install MongoDB we download one distributed package from the official website www.mongodb.com/download/The official website provides distribution packages for different platforms: Windows,...
MongoDB implements a new approach to database construction, where there are no tables, schemes, SQL queries, external keys, and many other things that are inherent in object-relational...
PreambleMongodb compass graphic client: For work with MongoDB, you can use the official graphic client Compass. If you didn’t install MongoDB, Mongo Compass, you can download it by going to...
PreambleThe whole model of the database device in MongoDB can be presented as follows:If in the relational databases the contents are tables, then in the working with databases consists of...
MySQL is the most popular open-source relational database management system. It is fast, easy to use, scalable, and an integral part of the popular LAMP and LEMP stacks.This article explains...
In this article, I will talk in detail, especially for beginner programmers, about how to create a database in Microsoft SQL Server, as well as what you should know before creating a...
PostgreSQL Comparison Operators are used in the WHERE sentence to determine which entries to choose. Here is a list of comparison statements that you can use in PostgreSQL :Comparison...
PostgreSQL EXISTS condition is used in combination with a subquery and is considered "satisfied" if the subquery returns at least one line. It can be used in SELECT, INSERT, UPDATE, or DELETE...
PostgreSQL BETWEEN condition is used to obtain values in the range in SELECT, INSERT, UPDATE, or DELETE operator. The syntax for BETWEEN condition in PostgreSQL expression BETWEEN value1_id AND...
PostgreSQL IS NOT NULL condition is used to check the value of NOT NULL in SELECT, INSERT, UPDATE or DELETE operators. The syntax for IS NOT NULL condition in PostgreSQL expression IS NOT...
PostgreSQL IS NULL condition is used to check the value of NULL in SELECT, INSERT, UPDATE or DELETE operators. The syntax for IS NULL condition in PostgreSQL IS expression NULL Parameters and...
The PostgreSQL NOT condition (also called the NOT operator) is used to deny the condition in SELECT, INSERT, UPDATE or DELETE. The syntax for NOT condition in PostgreSQL NOT...