HANA删除重复记录的方法 对于未建主键的表出现重复记录需要删除时,可以利用"$rowid$"进行区分并做处理 delete from TESTA WHERE testid IN (SELECT testid FROM TESTA GROUP BY testid HAVING COUNT(testid) > 1)AND "$rowid$" NOT IN (SELECT MIN("$rowid$
select count(EMPNUM) from employee group by EMPNUM having ( count(EMPNUM)>1) select sn from Form_YS_PayApply group by sn having ( count(sn)>1) --select * from Form_YS_PayApply where sn='FK
以表table为例, 表table中只有一个字段a 1) 找出重复记录 select a from table group by a having count(*) > 1 2) 删除重复记录 delete from table A where A.rowid < (select max(B.rowid) from table B where A.a = B.a) 表stuinf
SELECT NUMBER, NAME FROM T_SICK_NAME as a where exists ( SELECT 1 FROM (select NAME from T_SICK_NAME group by NAME having count(*) > 1 ) as b where a.NAME = b
案例: 目的:根据name和class分组,将ceshi表中相同的数据删除只保留id最小的那一条。 sql语句如下: DELETE FROM ceshi WHERE id NOT IN (SELECT id from ( SELECT min(id) AS id FROM ceshi GROUP BY `name`,class)a) 试验效果:
假设现有一张人员表(表名:Person),若想将姓名、身份证号、住址这三个字段完全相同的记录查找出来,使用 SELECT p1.* FROM persons p1,persons p2 WHERE p1.id<>p2.id AND p1.cardid = p2.cardid AND p1.pname = p
DELETE FROM tbl_vehicle_brand WHERE id NOT IN (SELECT tab.id FROM (SELECT MAX(id) AS id FROM tbl_vehicle_brand GROUP BY brand,series ) AS tab ) 经测试非常好用!! 来源:http://blog.csdn.net/wei
假如有一张users表,里面有user_id,user_name两个字段,用一条sql语句去掉数据库里的userName重复的记录.1.delete from users a where a.user_id = (select max(b.user_id) from users b where a.user_name=b.user_name);这一种自联接,效率低一点.2.delete from
虽说SQL语法,这些主流的数据库引擎都支持,但是每一个数据库引擎都有自己的特性,例如统计并显示非重复的数据。 mysql的实现形式是: 数据库test id name1a2a3b4c5b 比如我想用一条语句查询得到name不重复的所有数据,那就必须使用distinct去掉多余的重复记录。 SELECT DISTINCT name FROM test 得到的结果是: ab
假设现有一张人员表(表名:Person),若想将姓名、身份证号、住址这三个字段完全相同的记录查找出来,使用 1: SELECT p1.* 2: FROM persons p1,persons p2 3: WHERE p1.id<>p2.id 4: AND p1.cardid = p2.cardid 5: AN
代码如下 alter table goodstemp add AIndexId [int] IDENTITY (1, 1) NOT NULLgodelete from goodstemp where AIndexId not in (select min(AIndexId) from goodstemp group by goodsNo)goalter table goodstemp d
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 peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 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