Here you can get practice in constructing queries on data retrieving (SELECT statement of SQL language). The exercises included are addressing to beginners and can be solved in arbitrary order. In order your solutions have been stored in system, the statistics of the solved exercises were conducted, there was an opportunity of participation in ratings and discussions in forum the registration and the authorized logon is required.
On exercises' page it is possible to carry out any SELECT statements which are addressing to the learning databases. To switch off checking the correctness of the solutions, click "without check" checkbox.
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