更新 Oracle 11g 数据库中用户的最新行？

Question

我的代码在这个sqlFiddle。

创建表格

create table my_table ( pk number, created date, user_name varchar2(200), start_date date);

insert into my_table (pk, created,user_name) values (1, sysdate-1, 'bob');
insert into my_table (pk, created,user_name) values (2, sysdate-2, 'frank');
insert into my_table (pk, created,user_name) values (3, sysdate,'bob');
insert into my_table (pk, created,user_name) values (4, sysdate,'frank');

更新：

update my_table
set start_date = sysdate
  from my_table
 where pk = ( select max(pk) from my_table where user_name = 'bob' );

SQLFiddle 给了我这个错误：

ORA-00933: SQL command not properly ended : update my_table set start_date = sysdate from my_table where pk = ( select max(pk) from my_table where user_name = 'bob' )

但我确定我在正确的位置有一个分号。

什么给了？我对 SQL 很陌生，并认为这会起作用。

Answer 1

你不需要from:

update my_table
    set start_date = sysdate
     where pk = ( select max(pk) from my_table where user_name = 'bob' );

Answer 2

去掉from子句，你已经在顶部了：

update my_table
set start_date = sysdate
 where pk = ( select max(pk) from my_table where user_name = 'bob' );