Question

Is there any way to do an incremental update in an on duplicate key update insert in mysql?

例重/错误:

insert into blah (user_id, prefix, email_id, field, source) 
select user_id, substring(name, 1, 3), contact_email_id, 2, source from address_book 
on duplicate key update source = source + values(source);

ERROR 1052 (23000): Column  source  in field list is ambiguous

Answer 1

NO, you just cannot specify source = source + values(source);
because source table blah is not included in the select, using alias won t fix.

工作将使用<条码>。

insert into blah (user_id, prefix, email_id, field, source) 
select 
  ab1.user_id, substring(ab1.name, 1, 3), ab1.contact_email_id, 2, 
  if(ab2.source, ab1.source+ab2.source, ab1.source)
from 
  address_book ab1
left join
  blah1 as ab2
on 
  ab1.user_id=ab2.user_id
on duplicate key 
update source = values(source); 
/* values(source) = ab1.source+ab2.source if duplicate found */

<代码>1:N 关系

Answer 2

如果你把表格放在一栏名上,即:blah.source,地址是:book.source?

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