postgresql-9.3

The idea is that I have local database named northwind , and with postgres_fdw I want to connect with another database named test on localhost (remote connection simulation, for situations like when table in my database is updated, do something in other database like save to history etc..). So I opened psql console and type: CREATE SERVER app_db FOREIGN DATA WRAPPER postgres_fdw OPTIONS (dbname 'test', host 'localhost:5432'); As i found in A Look at Foreign Data Wrappers link. Next I also follow the tutorial: CREATE USER MAPPING for postgres SERVER app_db OPTIONS (user 'postgres', password

I need to filter by calculated column in postgres. It's easy with MySQL but how to implement with Postgres SQL ? pseudocode: select id, (cos(id) + cos(id)) as op from myTable WHERE op > 1; Any SQL tricks ? If you don't want to repeat the expression, you can use a derived table: select * from ( select id, cos(id) + cos(id) as op from myTable ) as t WHERE op > 1; This won't have any impact on the performance, it is merely syntactic sugar required by the SQL standard. Alternatively you could rewrite the above to a common table expression: with t as ( select id, cos(id) + cos(id) as op from

I am using "PostgreSQL 9.3.5" I have a Table ( StackOverflowTable ) with columns (SoId,SoName,SoDob) . I want a Sequence generator for column SoId which is a Alpha-numeric value. I want to auto increment a Alpha-Numeric Value in postgresql. For eg : SO10001, SO10002, SO10003.....SO99999. Edit: If tomorrow i need to generate a Sequence which can be as SO1000E100, SO1000E101,... and which has a good performance. Then what is the best solution! Use sequences and default value for id: postgres=# CREATE SEQUENCE xxx; CREATE SEQUENCE postgres=# SELECT setval('xxx', 10000); setval -------- 10000 (1

I try to copy the content of a CSV file into my postgresql db and I get this error "extra data after last expected column". The content of my CSV is agency_id,agency_name,agency_url,agency_timezone,agency_lang,agency_phone 100,RATP (100),http://www.ratp.fr/,CET,, and my postgresql command is COPY agency (agency_name, agency_url, agency_timezone) FROM 'myFile.txt' CSV HEADER DELIMITER ','; Here is my table CREATE TABLE agency ( agency_id character varying, agency_name character varying NOT NULL, agency_url character varying NOT NULL, agency_timezone character varying NOT NULL, agency_lang

We are running Postgres 9.3.5. (07/2014) We have quite some complex datawarehouse/reporting setup in place (ETL, materialized views, indexing, aggregations, analytical functions, ...). What I discovered right now may be difficult to implement in the optimizer (?), but it makes a huge difference in performance (only sample code with huge similarity to our query to reduce unnecessary complexity): create view foo as select sum(s.plan) over w_pyl as pyl_plan, -- money planned to spend in this pot/loc/year sum(s.booked) over w_pyl as pyl_booked, -- money already booked in this pot/loc/year -- money

I have a table temp defined like this: id | name | body | group_id ------------------------------- 1 | test_1 | body_1 | 1 2 | test_2 | body_2 | 1 3 | test_3 | body_3 | 2 4 | test_4 | body_4 | 2 I would like to produce a result grouped by group_id and aggregated to json. However, query like this: SELECT group_id, json_agg(ROW(id, name, body)) FROM temp GROUP BY group_id; Produces this result: 1;[{"f1":1,"f2":"test_1","f3":"body_1"}, {"f1":2,"f2":"test_2","f3":"body_2"}] 2;[{"f1":3,"f2":"test_3","f3":"body_3"}, {"f1":4,"f2":"test_4","f3":"body_4"}] The attributes in the json objects are named