帮我听一个英语句子里面的单词

帮我听一个英语句子里面的单词
相关文本：
Declare @MyString varchar(20)
Set @MyString='Customers'
--error clause
Select * From @MyString
我的音频翻译(缺单词)
So,in this case.I declare a variable call Mysting.Notice this is a
local variable with a single @ sign and it is a variable character string or a varchar.and it is a variable character string not more than 20 characters width which is this first line represent.and our next line is actually setting a line to that.so we placing the 'customers' in to a text string.so set Mystring equal to the text 'customers'.the problem have this point.if we want to run a statement.let's say "select * from @mystring".we will get a error.because SQL will not know how to that.