SQL (Structured Query Language) is a Relational Database language, used by most Relational Database software (such as ORACLE).

SQL Server is Microsoft's implementation of the language and database, for Windows servers. (WIN NT etc).

Other versions of SQL will not be affected by a virus targetted at the Microsoft product.

(HOWEVER, note that there does appear to be a fake virus warning email circulating which purports to come from MICROSOFT. The supposed patch itself contains a virus so DO NOT INSTALL IT. MICROSOFT does not issue patches by unsolicited email.)