如果发现重复项，是否使用MYSQL查询更新字段？

这是我的问题。我得到了一张表，意思是

ID - Meaning 1 - red car 2 - cat man 3 - red car 4 - ontime 5 - red car .... 这张桌子相当长，大约有10万行。该查询可能与此查询类似

Update Table Meaning set meaning=concat(meaning,"1") 
where meaning in (select meaning from Meaning group by meaning having count(meaning>1)

那么，解决这个问题的问题是什么呢

似乎我们必须使用

设置变量来检查每一行？
选择x*
SELECT x.*
     , CONCAT(x.meaning,CASE WHEN COUNT(*) = 1 THEN '' ELSE COUNT(*) END) meaning 
  FROM meanings 
     x JOIN meanings 
     y ON y.meaning = x.meaning 
   AND y.id <= x.id 
 GROUP 
    BY id;

，CONCAT（x.means，COUNT（*）=1时的大小写，然后是“”ELSE COUNT（*）END）表示
从意义上
x连接意义
y对y的意义=x的意义
和y.id步骤1：创建临时表

CREATE TABLE TMP (id int, meaning varchar (2));

insert into tmp 
SELECT id, 
CASE WHEN cnt =0 theN meaning ELSE concat(meaning,'[',cnt+1,']') END AS meaning 

FROM
(
SELECT t1.id, t1.meaning, (

SELECT COUNT( t.id ) 
FROM test t
where  t.meaning=t1.meaning 
and t.id<t1.id
) as cnt
FROM test t1
)TMP

步骤2：准备查询并插入临时表

CREATE TABLE TMP (id int, meaning varchar (2));

insert into tmp 
SELECT id, 
CASE WHEN cnt =0 theN meaning ELSE concat(meaning,'[',cnt+1,']') END AS meaning 

FROM
(
SELECT t1.id, t1.meaning, (

SELECT COUNT( t.id ) 
FROM test t
where  t.meaning=t1.meaning 
and t.id<t1.id
) as cnt
FROM test t1
)TMP

步骤4：迁移到原始

insert into test select * from tmp

为什么不首先让列唯一？我从其他来源获取数据，即problem@cen，这可能是不可能的，除非他先使记录唯一。我会使记录唯一后，有没有重复的Thax为您的答案，但我需要更新。你能提供更新查询吗？