dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &麻烦能把里面的引号说的具体些吗?就是哪个是单引号哪个是双引号

来源：学生作业学帮网编辑：学帮网时间：2024/07/02 00:20:33

dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &
麻烦能把里面的引号说的具体些吗?就是哪个是单引号哪个是双引号

外面是单引号,里面的是双引号

dim cm as New SqlCommand("select count(*) from Users where username ='" & txtusername.Text.Trim() &麻烦能把里面的引号说的具体些吗?就是哪个是单引号 哪个是双引号