1.查找重復數據表的id以及重復數據的條數
select max(id) as nid,count(id) as 重復條數 from tableName
group by linkname Having Count(*) > 1
2.查找重復數據表的主鍵
select id from UsedCar_Articles
where id not in (
select min(id) as nid from UsedCar_Articles
group by ArticleTitle Having Count(id) > 1
)
3.刪除重復的數據
delete from UsedCar_Articles
where id not in (
select min(id) as nid from UsedCar_Articles
group by ArticleTitle Having Count(id) > 1
)
4.插入重復的數據
INSERT Articles (ClassID, ArticleTitle,ArticleInfo,
ArticleClicks,IsHot,IsTop,IssueTime,
SiteProvinceID,SiteCityID)
SELECT ClassID, ArticleTitle,ArticleInfo,
ArticleClicks,IsHot,IsTop,IssueTime,
SiteProvinceID,SiteCityID
FROM Articles