SQL is the standard language for accessing and manipulating databases.
Common database management systems are: MySQL, SQL Server, Access, Oracle, Sybase, and DB2
Knowledge of SQL is invaluable for anyone who wants to store or retrieve data from a database.
A database usually contains one or more tables. Each table is identified by a name (e.g. "Customers" or "Orders"). Tables contain records (rows) with data.
Below is an example of a table called "Persons":
The table above contains three records (one for each person) and four columns (LastName, FirstName, Address, and City).
With SQL, we can query a database and have a result set returned.
A query like this:
Gives a result set like this:
Study our Complete SQL tutorial
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