| Number | Base of difference | SQL | MySQL | SQL Server |
| 1 | Appeared | SQL was first appeared in 1974. | When we say about MySQL it was first appeared on 23 May 1995. | SQL Server was first appeared on 24 April 1989. |
| 2 | Developed by | SQL was developed by IBM corporation. | On the other hand MySQL was developed by Oracle corporation. | SQL Server was developed by Microsoft Company. |
| 3 | Use of variables | When we say about variables in SQL there is no variables. | On the other hand MySQL can use variables constraints and data types. | SQL Server can use variables constraints and data types. |
| 4 | Definition | When we say about SQL (Structured Query Language) is useful for managing our relational databases. And it is used to query and operate the database. | MySQL is one of the most popular database management system which used for managing the relational database. It is scalable, fast and easy to use database. | SQL Server is an RDBMD database system which mainly developed for the windows system to store,retrieve and access data requested by the developer. |
| 5 | Used for | SQL is a query language to manage databases. | MySQL is database software that uses SQL language to conduct with the database. | SQL Server is also a software that uses SQL language to conduct with the database. |
| 6 | Update | AS we knows SQL is a programming lanaguage so it does not get any updates.Its commands are always fixed and remain the same. | MySQL is software, so it gets frequent updation. | SQL Server is also software, so it gets frequent updation. |
| 7 | Connector | SQL does not have support for any connector. | MySQL comes with an integrated tool(MySQL workbench) for designing and building databases. | SQL Server built-in connector is available only for Standard logic app workflows in Azure Logic Apps. |
| 8 | Storage | When we say about storage SQL supports a single storage engine. | When we say storage in MySQL this will supports multiple storage engines and also plug-in storage engines. | SQL Server supports multiple storage engines and also plug-in storage engines. |
| 9 | Writtent in
| - | MySQL is written in C and C++ | MSSQL is written in C and C++ |