( ) is a query language for manipulating data in a relational database.

[单选题]Arelation(from the relational database model)consistsof(由⋯⋯组成)a set of tuples(元组),whichimplies(意味着)that().A．all tuples in a relation must be distinct(独一无二的)B．every relation has a key(键)C．all of the aboveD．for any two tuples,the values associated with

[单选题]The relational database model requires the data be(71)through programs that don't rely on the position of the data in the database. This is in direct(72)to the other database mode, where the program has to follow a series of pointers to the data it

[多选题] You are managing a 24*7 database. The backup strategy for the database is to perform user-managed backups. Identify two prerequisites to perform the backups.（）A . The database must be opened in restricted mode.B . The database must be configured t

[单选题] (73) is a query language for manipulating data in a relational database.(73) A. AssembleB． SQLC． C++D． Fortran

[单选题] (73) is a query language for manipulating data in a relational database.(73)A. AssembleB．SQLC． C++D． Fortran

[单选题]The most common query language is______．A．CB．JavaC．perlD．SQL

[单选题]The iMOVE database (数据库) is a foreign language information platform for per

[单选题]The iMOVE database (数据库) is a foreign language information platform for per

[单选题]The iMOVE database (数据库) is a foreign language information platform for per

[单选题]The iMOVE database (数据库) is a foreign language information platform for per