On 10-Oct-05, at 9:42 AM, Gordon Heydon wrote:
Hi,
I have a couple of issues that I have been playing with for a project and can't quite get my head around it from a SQL POV.
Is it possible to list all the rows in a table where one column has more than one occurrence of the same value.
In this can I am storing the ip address of some submitted data, and I need to check to see if they have submitted more than 1 row. I don't care about the ones with a single occurance, but I need to know about the ones that appear more that one.
I think you're looking for something like: SELECT foo, bar, count(baz) as num FROM table GROUP BY foo, bar HAVING num > 1; (obviously you need to fill in the foo's and bar's to make it work right)
My second question is that.
I have 2 tables, one is a teams table which has a list of entered teams. The other table is a list of members for each team. One of the columns is the name of the member. What I would like to do is create a select from the team table which has a single column with a comma separated list of members in a single field. This means I could sort and use it as a method of detecting entries of multiple teams with the same members.
Or if anyone has a better ideas on how to detect duplicate entries would be most appreciated.
I'm not sure I understand the question here as well... but it doesn't sound like something you can do cleanly at the SQL level... -- James Walker :: http://walkah.net/