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【单选题】
关于索引描述错误的是( )。A.
表中的任何数据列都应该添加索引
B.
创建索引的列最好不要含有许多重复的值
C.
一般不给很少使用的列添加索引
D.
并不是数据库中聚集索引越多搜索效率就越高
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举一反三
【单选题】_____ is the most favorable payment term for the exporter.
A.
Cash with order
B.
Cash on delivery
C.
Cash against documents
D.
Cash in advance
【单选题】_______ is a very favorable payment term for the exporter.
A.
Cash with order
B.
Cash on delivery
C.
Cash against documents
D.
Payment in advance
【单选题】Regarding our good relationship, we will___accept your payment term.
A.
except
B.
exceptionally
C.
make an except to
D.
make an exception
【单选题】在数据库表employee中查找字段empid中以两个数字开头第三个字符是下画线”_"的所有记录,请问下列哪条语句是正确的( )
A.
select * from employee where empid like '[0-9][0-9]_%'
B.
select * from employee where empid like '[0-9][0-9]_[%]'
C.
select * from employee where empid like '[0-9]9[_]%'
D.
select * from employee where empid like '[0-9][0-9][_]'
【单选题】___ is the ideal payment term for the exporter.
A.
Cash against documents
B.
Cash on delivery
C.
Cash with order
D.
Payment in advance
【单选题】在数据库表employee中查找字段empid中以两个数字开头且第三个字符是下画线“_”所有记录。以下语句正确的是( )
A.
SELECT * FROM employee WHERE empid LIKE ‘[0-9][0-9]_%’
B.
SELECT * FROM employee WHERE empid LIKE ‘[0-9][0-9]_[%]’
C.
SELECT * FROM employee WHERE empid LIKE ‘[0-9]9[_]%’
D.
SELECT * FROM employee WHERE empid LIKE ‘[0-9][0-9][_]%’
【单选题】在数据库表employee中查找字段empid中以两个数字开头第三个字符是下画线“_”的所有记录。请选择以下正确的语句( )。
A.
SELECT * FROM employee WHERE empid LIKE '[0-9][0-9]_%'
B.
SELECT * FROM employee WHERE empid LIKE '[0-9][0-9]_[%]'
C.
SELECT * FROM employee WHERE empid LIKE '[0-9]9[_]%'
D.
SELECT * FROM employee WHERE empid LIKE '[0-9][0-9][_]%'
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