在SQL语言中的表是数据库的A.内模式B.模式C.外模式D.概念模式
在SQL语言中的表是数据库的
A.内模式
B.模式
C.外模式
D.概念模式
在SQL语言中的表是数据库的
A.内模式
B.模式
C.外模式
D.概念模式
A.B-ISDN
B.Fast Ethernet
C.Internet
D.Switching LAN
A.This is a one-dimensional array of records, also called a table.
B.This is so called record of arrays;
C.The event can occur in up to 20 places and on up to 5 different dates in each place.
D.A reference to r.place[i].date[j].mo will access the month of the jth occurrence, in the ith place, of
A.In -s/etc/hosts myfile
B.In -s myfile/etc/hosts
C.link -s/etc/hosts myfile
D.link -s myfile/etc/hosts
A.In -s/etc/hosts myfile
B.In -s myfile/etc/hosts
C.link -s/etc/hosts myfile
D.link -s myfile/etc/hosts
A.Reusability
B.Maintanence
C.Expansibility
D.Portability
A.Reusability
B.Maintanence
C.Expansibility
D.Portability
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