hello Peter, data_specific_to_device = contains diff values, and is different for different devices associated_service = will also be a list of values which will be different for different devices
and same for associated_device column. this data rarely(almost never) changes and add happens only say twice a month. So can I not have one big table like below? what disadvantage does it has? sorry I am not into RDBMS, so i want to know prob specific to my data and proposed table layout. I am also not clear about relating more than one tables, if i break this up in more than one table.... thx in advance. Rajeev ________________________________ From: Peter Brawley <peter.braw...@earthlink.net> To: Rajeev Prasad <rp.ne...@yahoo.com>; "mysql@lists.mysql.com" <mysql@lists.mysql.com> Sent: Wednesday, August 15, 2012 4:01 PM Subject: Re: suggestion needed for table design and relationship On 2012-08-15 1:54 PM, Rajeev Prasad wrote: > I have to keep this data in MySql, and i am not sure (as SQL/databse is not > my field) how to organise this into one or many tables? right now I would > represent my info as follows: > > device_name|HW_version|SW_version|IP_addr_pvt|IP_addr_pub|data_specific_to_device|associated_service > |associated_device > dev_x | 1234 |1234 |1.2.3.4 |9.8.7.6 |data_specific_to_x > |SVC_A,SVC_B,SVC_C... |dev_y,dev_z,dev_n,dev_m... > dev_y | 2348 |7734 |10.2.3.4 |99.8.7.6 > |data_specific_to_y.....|SVC_B,SVC_X... |dev_x,dev_m... > dev_z | 3934 |5634 |11.2.3.4 |79.8.7.6 > |data_specific_to_z.....|SVC_M |dev_n,dev_m... > ... > > > pl advice. what would be the best design? data_specific_to_device could be > more than one column, as i get to explore the data a bit more. > > and do i really need a device_id field? whi. ch any SQL table normally has. Without a primary key, a table isn't really a table. A surrogate (auto_increment) PK might be simplest. If the associated_service column is a list of values, it needs to be projected to a child table (parentkey, data item ...). From the info posted, I can't tell much about the other fields PB ----- > > ty. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
