sql - 如何从 MS-Access 中的同一字段更新 SQL 字段

Question

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

如何使用子查询与相同的文档update编号empty dategreatest date

最好的问候伊萨姆

Answer 1

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