如何从MS-Access中的相同字段更新SQL字段

Question

 - **Date          | DocNumber**
 - ------          | 5000001
 - ------          | 5000001
 - ------          | 5000001
 - 28/02/2014      | 5000001
 - 28/02/2014      | 5000001
 - 31/12/2013      | 5000001

如何update empty date greatest date使用{{1}}使用子查询获取相同文档编号

祝你好运 埃萨姆

Answer 1

Update mytable one
set one.date = (select max(date) from mytable two where two.docNumber = one.docNumber)
where one.date is null