SQL is a special programming language designed for managing data.
There is an ANSI standard but codes are always not portable among the different database systems.
For example, the statements that you have written for Sybase might not work if you use it to query an Oracle database.
In SQL, we always say that you only need to know the most common functions which are known as CRUD, create, read, update and delete.
If you are new to database, CRUD are just the functions that you need to learn.