The SQL Keywords are case-insensitive (SELECT
, FROM
, WHERE
, etc), but are often written in all caps. However in some setups table and column names are case-sensitive. MySQL has a configuration option to enable/disable it. Usually case-sensitive table and column names are the default on Linux MySQL and case-insensitive used to be the default on Windows, but now the installer asked about this during setup. For MSSQL it is a function of the database’s collation setting.
Here is the MySQL page about name case-sensitivity
Here is the article in MSDN about collations for MSSQL