[OT] SQL question

Pierre Sahores sc at sahores-conseil.com
Mon Nov 11 12:40:24 CET 2013


Hi Malte,

No sure that you can design such kind of request as long as write-mode requests don't handle heritage under PostgreSQL. If you use PG v 9.xx, you can try :

http://docs.postgresql.fr/9.0/rules.html

else, as long as PG nor LC-server will never be the bottleneck in about speed, ram and processor's cycles (Apache is, at least, teen time slower than PG or LC-Server), you should be OK in handling a serial of two requests (select + conditional insert) handled by some lc-script code.

Best,

Pierre

 
Le 11 nov. 2013 à 12:00, Malte Brill a écrit :

> Hi all,
> 
> I am tearing my hair out on an SQL query. Before I lose my marbles I'd better ask here:
> 
> given are 2 tables
> 
> table1
> 
> ID,UUID,first_number
> 
> 
> table 2
> 
> ID,UUID,running_number
> I need to do an INSERT into table 2. 
> 
> running_number should always be the last inserted running_number +1, if datasets for UUID are already present in table 2, otherwise, if no data is present for UUID,  it should be table1s first_number +1 for the given UUID.
> 
> Anybody can help me to put this into a single query? (reason I need it in one query is, that there might be concurring connections to the DB and I want to lock the table first on postGreSQL)
> 
> All the best,
> 
> Malte
> 
> 
> 
> 
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--
Pierre Sahores
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www.sahores-conseil.com




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