单选题SQL语句：alter database test modify name=mytest，其含义是（）。Amytest数据库更名为testBtest数据库更名为mytestCmytest数据文件更名为testDtest数据文件更名为mytest
单选题
SQL语句：alter database test modify name=mytest，其含义是（）。
A
mytest数据库更名为test
B
test数据库更名为mytest
C
mytest数据文件更名为test
D
test数据文件更名为mytest
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