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select customer.customer-name
from customer
where customer.customer-id=192-83-7465
--#1
select a.[customer-name]
from customer a
where a.[customer-id]='192-83-7465'
--#2
select [customer-name]
from customer
where [customer-id]='192-83-7465'
[customer-name]
select customer.customer-name
from customer
where customer.customer-id=192-83-7465 --这里的192-83-7465是一个字符串了,要用 ''
select customer.customer-name
from customer
where customer.customer-id='192-83-7465'