标签：sql

sql去重查询的方法：重复记录根据单个字段peopleId来判断，使用语句删除，代码为【where peopleId in (select peopleId from people group by peopleId...

SQL中select语句的语法结构是：“SELECT select_list [ INTO..] FROM table_name [ WHERE...] [ GROUP BY...][ HAVING...][ ORDER BY...];”。