DBMS stands for Database Management System.
A database management system is an application that enables the creation and administration of databases. Database management system is a broad term that includes any system that performs that function.
The most common type of DBMS is an RDBMS (Relational Database Management System). RDBMSs allow you to create relational databases – databases that have multiple tables that contain related data.
This article is Part 3 of the Microsoft Access tutorial.
Here’s what’s included in this article:
This article is Part 2 of the Microsoft Access tutorial.
Here’s what’s included in this article:
This article is Part 1 of the Microsoft Access tutorial.
Here’s what’s included in this article:
This Microsoft Access tutorial will show you how to use Microsoft Access to create a simple database with all the common features such as tables, forms, queries, and macros.
This tutorial is for beginners. No prior database knowledge is assumed.
The Input Mask Wizard is a feature of Microsoft Access that helps you create an input mask.
An input mask allows you to specify exactly how data should be entered into the database. It’s an expression that specifies certain rules about how the data should be formatted as it is entered into the system.
Here’s an example of an input mask:
(999) 000-0000
This specifies the format that a phone number must be entered. The number 9 indicates an optional character. The number 0 specifies a mandatory one. So in this example, the area code is optional.
The Expression Builder is a component of Microsoft Access that helps you build expressions. It allows you to look up and build expressions without having to remember how to type the full expression.
Different database management systems define schema in their own way. This can make it difficult for database developers to work out exactly what a schema is – especially when switching between different DBMSs.
This article provides definitions used by the three leading database systems.
In database terms, a schema (pronounced “skee-muh” or “skee-mah”) is the organisation and structure of a database. Both schemas and schemata can be used as plural forms.
A schema contains schema objects, which could be tables, columns, data types, views, stored procedures, relationships, primary keys, foreign keys, etc.
A database schema can be represented in a visual diagram, which shows the database objects and their relationship with each other.
Above is a simple example of a schema diagram. It shows three tables, along with their data types, relationships between the tables, as well as their primary keys and foreign keys.
Ever since its early days, there’s confusion over how to pronounce SQL. If you’ve ever worked in a large team of SQL developers, you might’ve heard some developers pronouncing it as “S-Q-L” or “ess-que-ell” [ ˈɛs kjuː ˈɛl ] and others using “sequel” [ ˈsiːkwəl ].
And the confusion extends itself to commercial and open source products too. Any mispronunciation will extend itself to products such as SQL Server and MySQL, not to mention product tools and features such as MySQL Workbench, mysqladmin, mysqldump, and Access’s SQL view, to name a few.