跨平台SQL语句模版 － SQL Server, MySQL, Oracle

It is essential to understand the details of the databases underlying the applications you work with; to know what
happens to which
tables when you perform an action in your application. No matter how
slick your SQL skills are, walking into a new situation with unfamiliar
databases is only going to make that task trickier; and most large
companies - and many small ones, too - will have a heterogeneous
database environment, unless you are very fortunate. Mixtures of SQL
Server and Oracle are fairly common, and every database type will have
different structures and different syntax to remember.

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