Each SQL statement contains one or more keywords. SQL is case insensitive to keywords, but throughout the documentation, keywords are indicated in uppercase.

For example, in the following statement, SELECT and FROM are keywords:

SELECT *
   FROM Employees;

The following statements are equivalent to the one above:

Select *
   From Employees;
select * from Employees;
sELECT * FRoM Employees;

Some keywords cannot be used as identifiers without surrounding them in double quotes. These are called reserved words. Other keywords, such as DBA, do not require double quotes, and are not reserved words.