This article contains the SQL ALTER DATABASE syntax, as implemented by various database management systems (DBMSs). The syntax is listed exactly as each vendor has listed it on their website. Click on the applicable link to view more detail about the syntax for a particular vendor.
The DBMSs covered are MySQL, SQL Server, PostgreSQL, and Oracle Database.
This article contains the SQL CREATE TABLE syntax, as implemented by various database management systems (DBMSs). The syntax is listed exactly as each vendor has listed it on their website. Click on the applicable link to view more detail about the syntax for a particular vendor.
The DBMSs covered are MySQL, SQL Server, PostgreSQL, and Oracle Database.
This article contains the SQL CREATE DATABASE syntax, as implemented by various database management systems (DBMSs). The syntax is listed exactly as each vendor has listed it on their website. Click on the applicable link to view more detail about the syntax for a particular vendor.
The DBMSs covered are MySQL, SQL Server, PostgreSQL, and Oracle Database.
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.
MySQL is an open source relational database management system (RDBMS). It is the world’s most popular open source RDBMS and is currently ranked as the second most popular RDBMS in the world (behind Oracle Database).
MySQL is available as a free download, however, several paid editions are also available which offer additional functionality.
As the name suggests, MySQL is based on SQL. The “My” part is named after co-founder Michael Widenius’ daughter, My.
To create a relationship in MySQL Workbench:
The relationship is now established. Repeat steps 4 to 6 for any other foreign key columns in that table.
To reverse engineer a database in MySQL Workbench:
The EER diagram is now displayed on the screen.
To stop/start MySQL using MySQL Workbench:
Here are screenshots for the above steps.