1，查询字段唯一值
select septemberdata.day from septemberdata group by septemberdata.day;
获取 septemberdata表day字段的唯一值
2.匹配某字段是否有某值
select membernum from septemberdata where membernum like '%E%';
筛选membernum段中含有E的值
1，查询字段唯一值
select septemberdata.day from septemberdata group by septemberdata.day;
获取 septemberdata表day字段的唯一值
2.匹配某字段是否有某值
select membernum from septemberdata where membernum like '%E%';
筛选membernum段中含有E的值
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