SQL-EX.ru is to build yourself the SQL statements for retrieval.
Title
SQL exercises
Description
About certification
We reason that the solution of a number of exercises attests sufficiently high qualification. Taking it into account as well as desire of our visitors to have official support of their qualification, the procedure of certification has been realized on the site. Note that acquisition of the certificate is of yours own free will. The solving the exercises and the participating in ratings remain free as before.
The certified professionals page gives information about certificate's owners. Also presence of certain certificate can be confirmed by indicating it's number below:
Requirements for getting the certificate
There are certificates of two types (see outlines). The first can be obtained by everyone who have solved all the first stage exercises (up to exercise #67). The second can be obtained by everyone who solved 125 exercises. The time for solution of needed number of exercises and rating position are of no concern. Nevertheless, we reserve the right to change exercises and number of exercises needed for certificate as well.
