Re: [sqlite] Update value from either database table?
On Feb 4, 2008 1:56 PM, Gussimulator <[EMAIL PROTECTED]> wrote: > I have a field I need to update given a condition, but I don't know wether > the condition occurs in table A or table B, how can I perform this query? > > I have 2 identical tables in design, but one contains system data and the > other one contains user data... On my update routine (in C) I have to > increase an INTEGER field from either table given a condition... The thing > is, the condition could be present on both tables... what should I do?? > > Thanks! I'm no database expert, but why not merge them with a single table, like this? [[ create table MyTable (foo, bar, baz, user_data INTEGER) ]] with user_data=0 for the "system" data, and user_data=1 for the "user" data. Unique/Primary-key constraints can be kept unique by appending the user_data column to the index (how well does SQLite perform with regard to multi-column indices, btw?) -- -- Stevie-O Real programmers use COPY CON PROGRAM.EXE ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Update value from either database table?
table a: dict_base table b: dict_user condition: wether 'sz_word' = 'X' increase the value of 'dw_uses' by 1 sz_word could be in either table, dw_uses must be updated on the pertinent table/s though. Sorry for not being too clear :) Thanks again - Original Message - From: "Fowler, Jeff" <[EMAIL PROTECTED]> To: "General Discussion of SQLite Database" Sent: Monday, February 04, 2008 4:59 PM Subject: Re: [sqlite] Update value from either database table? > Without more info, here's the general approach: > > UPDATE c > SET int_field = int_field+1 > WHERE (table a condition) OR (table b condition) > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Gussimulator > Sent: Monday, February 04, 2008 1:57 PM > To: sqlite-users@sqlite.org > Subject: [sqlite] Update value from either database table? > > I have a field I need to update given a condition, but I don't know > wether the condition occurs in table A or table B, how can I perform > this query? > > I have 2 identical tables in design, but one contains system data and > the other one contains user data... On my update routine (in C) I have > to increase an INTEGER field from either table given a condition... The > thing is, the condition could be present on both tables... what should I > do?? > > Thanks! > > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Update value from either database table?
Gussimulator <[EMAIL PROTECTED]> wrote: > I have a field I need to update given a condition, but I don't know > wether the condition occurs in table A or table B, how can I perform > this query? > > I have 2 identical tables in design, but one contains system data and > the other one contains user data... On my update routine (in C) I > have to increase an INTEGER field from either table given a > condition... The thing is, the condition could be present on both > tables... what should I do?? When the condition holds in both tables, which one are you supposed to update? Do you need to update both? You could do the latter simply by running two almost-identical UPDATE statements, one against each table. Igor Tandetnik ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Update value from either database table?
Without more info, here's the general approach: UPDATE c SET int_field = int_field+1 WHERE (table a condition) OR (table b condition) -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gussimulator Sent: Monday, February 04, 2008 1:57 PM To: sqlite-users@sqlite.org Subject: [sqlite] Update value from either database table? I have a field I need to update given a condition, but I don't know wether the condition occurs in table A or table B, how can I perform this query? I have 2 identical tables in design, but one contains system data and the other one contains user data... On my update routine (in C) I have to increase an INTEGER field from either table given a condition... The thing is, the condition could be present on both tables... what should I do?? Thanks! ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] Update value from either database table?
I have a field I need to update given a condition, but I don't know wether the condition occurs in table A or table B, how can I perform this query? I have 2 identical tables in design, but one contains system data and the other one contains user data... On my update routine (in C) I have to increase an INTEGER field from either table given a condition... The thing is, the condition could be present on both tables... what should I do?? Thanks! ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
