Implementation of Division Operation of Relational Algebra in SQL
Tian Yuan · Modern Computer · 2010
As one of the traditional expressions of relational data manipulation language abbreviated as RDML,relational algebra is the important theoretical base of SQL.Understanding of the relationship between relational algebra and SQL is beneficial for mastering the grammar structure of SQL.While division that is the most complicate operation in relational algebra can not be found a corresponding operator in SQL.Aiming at the current situation,discusses the execution of division in SQL.