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举一反三
【简答题】“向emp表增加一个k列，其数据类型为9个字符型”的SQL语句是：ALTER TABLE emp __________。
【单选题】View the Exhibit and examine the structure of the EMP table. You executed the following command to add a primary key to the EMP table： ALTER TABLE emp ADD CONSTRAINT emp_id_pk PRIMARY KEY （emp_id...
A.
The PRIMARY KEY is created along with a new index.
B.
The PRIMARY KEY is created and it would use an existing unique index.
C.
The PRIMARY KEY would be created in a disabled state because it is using an existing index.
D.
The statement produces an error because the USING clause is permitted only in the CREATE TABLE command.
【简答题】使用SQL语句删除“订购单”表的候选索引emp： ALTER TABLE 订购单 ______________TAG emp
【单选题】修改EMP表ENAME字段, ALTER TABLE EMP ENAME nvarchar2(12);
A.
CHANGE
B.
CHANGING
C.
MODIFY
D.
MODIFIED
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