摘要: sql示例: SELECT substring_index(substring_index('张三,李四,王五,赵六,杨七',',',help_topic_id + 1),',' ,- 1) AS Id FROM mysql.help_topic WHERE help_topic_id < (len 阅读全文
posted @ 2021-09-24 14:37 与f 阅读(10065) 评论(0) 推荐(0)