sql-ex.ru - SQL exercises

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Keywords: sql, practice, delete, syntax, insert, statement, structured query language, dml, learning, testing

sql-ex.com - SQL exercises

Keywords: sql, practice, delete, syntax, insert, statement, structured query language, dml, learning, testing

cert.sql-ex.ru - e-learning

Keywords: sql, practice, delete, syntax, insert, statement, structured query language, dml, learning, testing