【单选题】MySQL 中用于删除外键的语句是()
A、DROP FOREIGN KEY....
B、ALTER TABLE ... DROP FOREIGN KEY
C、ALTER FOREIGN KEY...
D、DROP TABLE...FOREIGN KEY...
A、DROP FOREIGN KEY....
B、ALTER TABLE ... DROP FOREIGN KEY
C、ALTER FOREIGN KEY...
D、DROP TABLE...FOREIGN KEY...
A、ALTER TABLE...ADD CONSTRAINT...FOREIGN KEY...REFERENCES...
B、ADD CONSTRAINT...FOREIGN KEY...REFERENCES...
C、ALTER TABLE...ADD CONSTRAINT...PRIMARY KEY...REFERENCES...
D、ADD CONSTRAINT...PRIMARY KEY...REFERENCES...
A.delete primary key
B.delete foreignkey
C.drop primary key
D.drop foreign key
A、ALTER TABLE ...DELETE...
B、ALTER TABLE...DELETE COLUMN...
C、ALTER TABLE...DROP....
D、ALTER TABLE...DROP COLUMN....
A、ALTER table 表名 DROP PRIMARY KEY
B、ALTER table 表名 DROP FOREIGN KEY
C、ALTER table 表名 DROP KEY
D、ALTER table 表名 DROP INDEX 索引名
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