單項(xiàng)選擇題顯示所有數(shù)據(jù)庫的命令()

A.show all
B.show database
C.show databases
D.show tables


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1.單項(xiàng)選擇題向表中插入一個(gè)和已有紀(jì)錄關(guān)鍵字段一樣的紀(jì)錄的命令為()

A.insert into
B.replace into
C.insert from
D.replace from

2.單項(xiàng)選擇題顯示所有錯(cuò)誤的命令為()

A.show errors
B.show databases
C.show variables
D.show warnings

3.單項(xiàng)選擇題向表中插入一個(gè)新行的紀(jì)錄的命令為()

A.insert into
B.replace into
C.insert from
D.replace from

4.單項(xiàng)選擇題修改表的命令為()

A.Create table
B.rename table
C.alter table
D.drop table

5.多項(xiàng)選擇題數(shù)據(jù)庫xscj中有xs表,下列()語句可以執(zhí)行。

A.use xscj
B.use xs
C.rename table xs to xs1
D.rename database xscj to xscj1