$sql = "select tb_note.,answ. from tb_note left join";这句话解

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/09 06:01:28

$sql = "select tb_note.*,answ.* from tb_note left join";这句话解释下,
left 还有.*,answ.*

这是一个sql,而且是没写完成的sql
正确的应该是：
select tb_note.*,answ.* from tb_note left join answ on 条件
tb_note.*表示选择tb_note表的全部字段
answ.*表示选择answ表的全部字段
left join是左连接,把2个表连接起来

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