如何在Oracle 11g中更新具有不同值的列？

Question

I have a table with name "User_Report" with these columns.

ID       Name    City    zip    Report_File
101      AAA     PPP     123     -----
102      BBB     QQQ     345     -----
103      CCC     RRR     567     -----
104      FFF     SSS     789     -----

I added Report_File new column and i need to update this column with Name+".rpt". How i can update Report_File column with corressponding Name column data in a single update statement?

Please send me one example?

Thanks in advance.

Answer 1

Please try below query. In oracle double pipes ( || ) are used for concatenation of strings:

Update User_Report
SET Report_File=Name||'.rpt';

OR keyword CONCAT can be used. Refer LINK

Update User_Report
SET Report_File=CONCACT(Name, '.rpt')

Answer 2

Your report_file column appears to be a calculated value, if it will never deviate, then you might consider a virtual column.

alter table user_report add (report_file varchar(40) as (name||'.rpt'));

This way you never have to worry about keeping it in synch, it will always be in synch if name changes or new values are inserted.