摘要: ## 联表查询 ```sqlselect xx from xx left join xx on xx --左连接select xx from xx right join xx on xx --右连接select xx from xx inner join xx on xx --右连接--可以加whe 阅读全文
posted @ 2021-11-23 11:08 入星辰 阅读(39) 评论(0) 推荐(0)