若删除关系R中的全部元组,下列哪一个语句是正确的?( )
A: DELETE FROM R;
B: DROP * FROM TABLE R;
C: DROP TABLE R;
D: DELETE * FROM R;
A: DELETE FROM R;
B: DROP * FROM TABLE R;
C: DROP TABLE R;
D: DELETE * FROM R;
举一反三
- 若删除关系R上的索引Stusname,下列哪一个语句是正确的?( ) A: DROP Stusname FROM R; B: DELETE Stusname FROM R; C: DELETE INDEX Stusname; D: DROP INDEX Stusname;
- 删除数据中表的命令是()。 A: delete<br/>table B: delete<br/>from table C: drop<br/>table D: drop<br/>from table
- 若要删除数据库中已经存在的表S,可用_________语句。 A: DELETE TABLE S B: DELETE FROM S C: DROP TABLE S D: DROP FROM S
- MySQL中,删除列的SQL语句是() A: ALTER TABLE ……DELETE…… B: ALTER TABLE ……DELETE COLUMN…… C: ALTER TABLE ……DROP COLUMN…… D: DELETE FROM ……
- 若要删除book表中的所有数据,以下语句正确的是() A: DROP<br/>FROM book B: DROP<br/>TABLE book C: DELETE<br/>FROM book D: DELETE<br/>TABLE book