Php 检查重复行并更新状态，保持第一个数据不变

我的表格示例：

Table_1

+-----id-----+-----zone-----+-----address-----+-----status-----+
=============+==============+=================+================+
     1              5                10               ok
     2              2                 8               ok
     3              3                 2               ok  
     4              2                 5               ok
     5              3                 2               ok 
     6              5                10               ok     
     7              3                 2               ok    

我需要检查重复条目[zone/address Composition]，并将表格如下所示：

Table_1

+-----id-----+-----zone-----+-----address-----+-----status-----+
=============+==============+=================+================+
     1              5                10               ok
     2              2                 8               ok
     3              3                 2               ok  
     4              2                 5               ok
     5              3                 2               duplicate 
     6              5                10               duplicate 
     7              3                 2               duplicate 

查询应检查区域、地址的重复组合，并应更新“状态”列。 我需要保持第一个重复数据状态不变，其余重复数据应标记为“重复”

---

关于如何做到这一点有什么想法吗？

我还没有测试过它，但类似的东西应该可以工作

update table_1 set status = 'duplicate' 
where exists 
select 1 from table_1 t 
where id != t.id
and zone = t.zone
and address = t.address
and t.status = 'ok'

---

你可以分两步来做

# set all duplicate rows as "duplicate"
UPDATE Table_1 t1,(SELECT DISTINCT _t1.id,_t1.zone,_t1.address 
                   FROM Table_1 _t1 
                   INNER JOIN Table_1 _t2
                         ON (_t1.address= _t2.address AND _t1.zone = _t2.zone AND _t1.id != _t2.id) 
                   ) t2 
SET t1.status = 'duplicate' WHERE t2.id = t1.id;

及

你可以用这个：

update
  Table_1 t1 inner join Table_1 t2
  on t1.zone=t2.zone
     and t1.address=t2.address
     and t1.id>t2.id
set t1.status='duplicate'

update
  Table_1 t1 inner join Table_1 t2
  on t1.zone=t2.zone
     and t1.address=t2.address
     and t1.id>t2.id
set t1.status='duplicate'