Home
| Calendar
| Mail Lists
| List Archives
| Desktop SIG
| Hardware Hacking SIG
Wiki | Flickr | PicasaWeb | Video | Maps & Directions | Installfests | Keysignings Linux Cafe | Meeting Notes | Linux Links | Bling | About BLU |
On Sat, Oct 05, 2013 at 09:43:53AM -0400, Bill Horne wrote: > OK, suppose I have three tables, constructed like so: > > <key> | Name | Address | City | State | Zip | TN | Ext | Cell | - > call it the "People" table > > <key> | <People key> | Meeting Description| Start Date | End Date | > - call this the "Meetings" table > > <key> | <People key> | Evaluation Type | Date of evaluation | Reason > for evaluation | Result | - call this the "Evaluations" table > > Now, I want to query *BOTH* the "Meetings" and "Evaluations" tables, > and get a result which shows every entry in the "People" table which > matches *EITHER* a meeting or an evaluation (or both), within a > range of dates, without any duplicates. In other words, I want a > list of people who attended a meeting or received an evaluation > during the time period. It sounds like you want UNION. SELECT * FROM People WHERE <key> IN (SELECT <People key> FROM Meetings UNION SELECT <People key> FROM Evaluations) -- Alex Pennace, alex at pennace.org, http://osiris.978.org/~alex/
BLU is a member of BostonUserGroups | |
We also thank MIT for the use of their facilities. |