7.??考虑如下数据表和查询,如何添加索引功能提高查询速度?( )
Create table mytable(
Id int,
Name char(100),
Address1 varchar(100),
Address2 varchar(100),
Zipcode varshar(10),
Sity varchar(50),
Province varchar(2)
)
Select id, varchar
From mytable
Whe
A. 给Zipcode添加全文的索引
B. 给Name添加索引
C. 给Id添加索引,然后给Name和Zipcode分别添加索引
D. 给id添加索引
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