Question

我的名为simple_data的表在名为MSISDN的列中有数百万个手机号码，但它包含重复项。

所有行都将FLAG列设置为零。

我想通过将FLAG值设置为2除一行来更新所有重复行。

CREATE TABLE `wt_simple_data` (
  `SIMPLEID` int(10) NOT NULL AUTO_INCREMENT,
  `CAMPID` bigint(20) NOT NULL,
  `MSISDN` bigint(20) NOT NULL,
  `FLAG` enum('0','1','2') DEFAULT '0' COMMENT '0 FOR NOT SENT, 1 FOR SENT',
  PRIMARY KEY (`SIMPLEID`)

) ENGINE=InnoDB  DEFAULT CHARSET=latin1

一些示例数据：

SIMPLEID  CAMPID     MSISDN        FLAG    
 15        311      9874123411      0    
 16        311      9874123411      0    
 17        311      9874123411      0    
 18        311      9874123412      0    
 19        311      9874123412      0    
 20        311      9874123413      0    
 21        311      9874123413      0    
 22        311      9874123414      0

我想要的结果

SIMPLEID  CAMPID     MSISDN        FLAG    
 15        311      9874123411      0    
 16        311      9874123411      2    
 17        311      9874123411      2    
 18        311      9874123412      0    
 19        311      9874123412      2    
 20        311      9874123413      0    
 21        311      9874123413      2    
 22        311      9874123414      0

Answer 1

您可以使用JOIN并将第一条记录保留为0

update 
wt_simple_data w1 
join ( 
  select 
   min(SIMPLEID) as SIMPLEID,
   CAMPID,
   MSISDN 
   from wt_simple_data 
   group by CAMPID,MSISDN 
)w2 
on w1.SIMPLEID > w2.SIMPLEID 
and w1.CAMPID = w2.CAMPID 
and w1.MSISDN = w2.MSISDN 
set w1.FLAG = '2'

Answer 2

一般SQL：

UPDATE wt_simple_data
SET flag='2'
WHERE simpleid IN (
    SELECT simpleid FROM wt_simple_data WHERE flag = '0'
    MINUS
    SELECT MIN(simpleid) FROM wt_simple_data WHERE flag = '0'
    GROUP BY msisdn
)

使用分析功能：

UPDATE wt_simple_data
SET flag='2'
WHERE simpleid IN (
    SELECT simpleid
    FROM (
        SELECT MIN(simpleid) OVER (PARTITION BY msisdn) minsimpleid, simpleid
        FROM wt_simple_data
        WHERE flag = '0')
    WHERE minsimpleid <> simpleid
)

Answer 3

你可以试试吗

UPDATE a 
SET a.Flag = 2
FROM wt_simple_data a
INNER JOIN (SELECT MIN(SIMPLEID) SIMPLEID, CAMPID, MISSION 
                     FROM wt_simple_data
         GROUP BY CAMPID, MISSION
                    ) ON a.CampId = b.CampId AND a.Mission = b.Mission AND a.SimpleId > b.SimpleId

更新除一个之外的重复行

3 个答案: