What can SQL DO? and How many types of Database

• SQL can execute queries against a database
• SQL can retrieve data form a database
• SQL can insert records in a database
• SQL can update records in a database
• SQL can delete records from a database.
• SQL can create new database
• SQL can create new table.
• SQL can create stored procedures in a database.
• SQL can create views in a database.
• SQL can set permissions on tables, procedures and views.

There are lots of different database systems.
1) Microsoft SQL server
2) Oracle
3) My SQL
4) Microsoft Access
5) IBM DB2
6) Sybase