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：学生作业帮助网编辑：作业帮时间：2024/05/16 04:48:22

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
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

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

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