sql="delete from xiaolei where dalei_mz='"&dalei_mz&"'"

来源：学生作业帮编辑：作业帮分类：语文作业时间：2024/05/29 13:53:36

sql="delete from xiaolei where dalei_mz='"&dalei_mz&"'"
sql语句中第二个等号后面的单引号是什么意思；单引号后面的双引号又是什么意思,单引号是定界符；双引号是什么（加什么）

单引号是SQL语句的一部分
因为最终的SQL语句是 delete from xiaolei where dalei_mz='dalei_mz'
所以是字符串: delete from xiaolei where dalei_mz=' (所以在两端加上双引号).再加上dalei_mz这个变量的值, 再在后面加一个字符串:单引号(字符串的两端要加双引号,所以是"'").这样就组成了一个完整的SQL语句.
够详细的吧.

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