postgresql-9.1

I'm having trouble sorting the result of a query. After executing this query: SELECT id_doc_header, id_clasificacion_doc FROM cabecera_documento INNER JOIN tipo_doc USING (id_tipo_doc) INNER JOIN clasificacion_documento USING (id_clasificacion_doc) WHERE finalizado = 'f' AND cod_exp = '10-APC-2013' AND id_clasificacion_doc in(2,3,4,5) ORDER BY case when Id_clasificacion_doc = 5 THEN 5 when Id_clasificacion_doc = 3 THEN 3 when Id_clasificacion_doc = 2 THEN 2 when Id_clasificacion_doc = 4 THEN 4 END; or this: SELECT id_doc_header, id_clasificacion_doc FROM cabecera_documento INNER JOIN tipo_doc

CREATE OR REPLACE FUNCTION drop_now() RETURNS void AS $BODY$ DECLARE row record; BEGIN RAISE INFO 'in'; FOR row IN select relname from pg_stat_user_tables WHERE schemaname='public' AND relname LIKE '%test%' LOOP IF EXISTS(SELECT row.relname.tm FROM row.relname WHERE row.relname.tm < current_timestamp - INTERVAL '90 minutes' LIMIT 1) THEN -- EXECUTE 'DROP TABLE ' || quote_ident(row.relname); RAISE INFO 'Dropped table: %', quote_ident(row.relname); END IF; END LOOP; END; $BODY$ LANGUAGE plpgsql VOLATILE; Could you tell me how to use variables in SELECT which is inside IF EXISTS ? At the present

I am using Ubuntu 12.10 64-bit and I have following packages installed : dpkg --get-selections | grep postgre output: postgresql postgresql-9.1 postgresql-client postgresql-client-9.1 postgresql-client-common postgresql-common postgresql-contrib postgresql-contrib-9.1 postgresql-server-dev-9.1 postgresql-server-dev-all libpq-dev libpq5 rvm 1.17.9 ruby 1.9.3p362 (2012-12-25 revision 38607) [x86_64-linux] I am not able to install pg gem I am getting following error : ERROR: Error installing pg: ERROR: Failed to build gem native extension. /home/vedarthk/.rvm/rubies/ruby-1.9.3-p362/bin/ruby

I have a model Task t.string "name" t.hstore "actions" Example: #<Task id: 1, name: "first", actions: {"today"=>"9"}, #<Task id: 2, name: "second", actions: {"yesterday"=>"1"}, #<Task id: 3, name: "third", actions: nil, #<Task id: 4, name: "four", actions: {"today"=>"11"}, I need to find all records where actions: nil, :today<10 and key :today not present. It is 1,2,3 task. Task.where("actions -> 'today' < '10'") - it return only first task. Task.where("actions -> 'today' < '10' OR actions IS NULL") - it return 1 and 3 records. How i can find all records which do not have the key :today in

I am representing a graph in Postgres 9.1 (happens to be bidirectional and cyclic): CREATE TABLE nodes ( id SERIAL PRIMARY KEY, name text ); CREATE TABLE edges ( id SERIAL PRIMARY KEY, node1_id int REFERENCES nodes(id), node2_id int REFERENCES nodes(id) ); Given a particular node ID, want to retrieve all other nodes in that cluster. I started with the "Paths from a single node" example here , and this is where I got: WITH RECURSIVE search_graph(id, path) AS ( SELECT id, ARRAY[id] FROM nodes UNION SELECT e.node2_id, sg.path || e.node2_id FROM search_graph sg JOIN edges e ON e.node1_id = sg.id )

I'm trying to create a table as follows: CREATE TABLE SCHEDULE ( SESSIONID SERIAL, MODULECODE VARCHAR(10), CONSTRAINT SCHEDULE_FOREIGN_KEY FOREIGN KEY (MODULECODE) REFERENCES MODULES (MODULECODE), CONSTRAINT SCHEDULE_PRIMARY_KEY PRIMARY KEY (SESSIONID, MODULECODE)); The idea being that SESSION ID would auto increment with each new row but only local to MODULECODE , for example: ---------------------- |SESSIONID|MODULECODE| |---------|----------| | 1 | A | | 2 | A | | 3 | A | | 1 | B | | 2 | B | | 1 | C | | 2 | C | |--------------------| I believe this is how AUTO_INCREMENT functions in MySQL

I have a query on a 500 000 row table. Basically WHERE s3_.id = 287 ORDER BY m0_.id DESC LIMIT 25 => Query runtime = 20ms WHERE s3_.id = 287 ORDER BY m0_.created_at DESC LIMIT 25 => Query runtime = 15000ms or more There is an index on created_at. The Query plans are completely different. Unfortunately I am not a query plan guru. I would like to reproduce the fast query plan while ordering by created_at. Is that possible and how would I go about that ? Query Plan - Slow Query (order by m0_.created_at) : http://explain.depesz.com/s/KBl Query Plan - Fast Query ( order by m0_.id ): http://explain