sql语句： 1.Select COUNT(distinct ann_id) from dmdb.t_bond_ann_att_info where last_update_time >= '2018-03-09 14:00:00'; 2.Select COUNT(id) from dmdb.t_bond_ann_info where create_time >= '2018-03-09 14:00:00'; 3.Select a.* from dmdb.t_bond_ann_info a where a.id not in ( select ann_id from t_bond_ann_att_info where last_update_time >= '2018-03-09 14:00:00' ) and a.create_time >= '2018-03-09 14:00:00'; 4.Select distinct a.ann_id from dmdb.t_bond_ann_att_info a where a.ann_id not in ( select id from t_bond_ann_info where create_time >= '2018-03-09 11:10:00' ) and last_update_time >= '2018-03-09 11:10:00'; 5.select * from t_bond_ann_att_info where ann_id in ('13441','13442') 6.delete from t_bond_ann_att_info where ann_id in ('13441','13442') 7.Select * from dmdb.t_bond_ann_info order by create_time DESC limit 800
8.select * from dmdb.t_bond_ann_att_info where ann_id=15068
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1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断 select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 例二： select * from testtable where numeber in (select number from people group by number having count(number) > 1 ) 可以查出testtable表中number相同的记录 2、删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录 delete from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1) 3、查找表中多余的重复记录（多个字段） select * fromvitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) 4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录 delete fromvitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1) 5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录 select * fromvitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1) (二) 比方说在A表中存在一个字段“name”，而且不同记录之间的“name”值有可能会相同， 现在就是需要查询出在该表中的各记录之间，“name”值存在重复的项； Select Name,Count(*) From A Group By Name Having Count(*) > 1 如果还查性别也相同大则如下: Select Name,sex,Count(*) From A Group By Name,sex Having Count(*) > 1 方法二 有两个意义上的重复记录，一是完全重复的记录，也即所有字段均重复的记录，二是部分关键字段重复的记录， 比如Name字段重复，而其他字段不一定重复或都重复可以忽略。 1、对于第一种重复，比较容易解决，使用 select distinct * from tableName 就可以得到无重复记录的结果集。 如果该表需要删除重复的记录（重复记录保留1条），可以按以下方法删除 select distinct * into #Tmp fromtableName
drop tabletableName select * into tableName from#Tmp
drop table #Tmp
发生这种重复的原因是表设计不周产生的，增加唯一索引列即可解决。 2、这类重复问题通常要求保留重复记录中的第一条记录，操作方法如下 假设有重复的字段为Name,Address，要求得到这两个字段唯一的结果集 select identity(int,1,1) as autoID, * into #Tmp fromtableName
select min(autoID) as autoID into #Tmp2 from #Tmp group byName,autoID
select * from #Tmp where autoID in(select autoID from #tmp2)
最后一个select即得到了Name，Address不重复的结果集（但多了一个autoID字段，实际写时可以写在select子句中省去此列） (四) 查询重复 select * from tablename where id in( select id fromtablename group by id having count(id) > 1 )
