查詢表中字段重複記錄的SQL

如何查找同一個字段有重複記錄的數據

1. 查找表中多餘的重複記錄，重複記錄是根據單個字段（peopleId）來判斷

select * from people  
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)

1. 刪除表中多餘的重複記錄，重複記錄是根據單個字段（peopleId）來判斷，只留有rowid最小的記錄

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)

1. 查找表中多餘的重複記錄（多個字段）

select * from vitae a  
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)  

1. 刪除表中多餘的重複記錄（多個字段），只留有rowid最小的記錄

delete from vitae 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) 

1. 查找表中多餘的重複記錄（多個字段），不包含rowid最小的記錄

select * from vitae 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)