postgresql-9.3

I'm working on a Rails application that utilizes the Postgres JSON data type. I have a JSON column called data in a table called reports . Let's say I have multiple entries like this: Entry 1: {"objects":[{"album": 1, "src":"fooA.png", "pos": "top"}, {"album": 2, "src":"barB.png", "pos": "top"}], "background":"background.png"} Entry 2: {"objects":[{"album": 1, "src":"fooA.png", "pos": "top"}, {"album": 2, "src":"barC.png", "pos": "top"}], "background":"bacakground.png"} Entry 3: {"objects":[{"album": 1, "src":"fooA.png", "pos": "middle"},{"album": 2, "src":"barB.png", "pos": "middle"}],

I have a table called as matrix which contains two columns namely cola and colb as shown below: Table : matrix create table matrix ( cola varchar(10), colb varchar(10) ); Insertion of rows : insert into matrix values('A1','B1'),('A2','B2'),('A3','B3'),('A4','B4'), ('A5','B5'),('A6','B6'),('A7','B7'),('A8','B8'), ('A9','B9'),('A10','B10'),('A11','B11'),('A12','B12'), ('A13','B13'),('A14','B14'),('A15','B15'),('A16','B16'), ('A17','B17'),('A18','B18'),('A19','B19'),('A20','B20'), ('A21','B21'),('A22','B22'),('A23','B23'),('A24','B24'), ('A25','B25'),('A26','B26'),('A27','B27'),('A28','B28'), (

I understand that using SELECT unnest(ARRAY[5,3,9]) as id without an ORDER BY clause, the order of the result set is not guaranteed. I could for example get: id -- 3 5 9 But what about the following request: SELECT unnest(ARRAY[5,3,9]) as id, unnest(ARRAY(select generate_series(1, array_length(ARRAY[5,3,9], 1)))) as idx ORDER BY idx ASC Is it guaranteed that the 2 unnest() calls (which have the same length) will unroll in parallel and that the index idx will indeed match the position of the item in the array? I am using PostgreSQL 9.3.3. Erwin Brandstetter Yes, that is a feature of Postgres

In PostgreSQL 9.3 Beta 2 (?), how do I create an index on a JSON field? I tried it using the -> operator used for hstore but got the following error: CREATE TABLE publishers(id INT, info JSON); CREATE INDEX ON publishers((info->'name')); ERROR: data type json has no default operator class for access method "btree" HINT: You must specify an operator class for the index or define a default operator class for the data type. rlib Found: CREATE TABLE publishers(id INT, info JSON); CREATE INDEX ON publishers((info->>'name')); 来源： https://stackoverflow.com/questions/17807030/how-to-create-index-on

Recently upgraded to using PostgreSQL 9.3.1 to leverage the JSONfunctionalities. In my table I have a json type column that has a structure like this: { "id": "123", "name": "foo", "emails":[ { "id": "123", "address": "somethinghere" }, { "id": "456", "address": "soemthing" } ] } This is just dummy data for the purpose of the question. Is it possible to query for a specific item in the emails array based on the id? Pretty much: "return email where id=123)"? Erwin Brandstetter Yes, that's possible: SELECT * FROM tbl t, json_array_elements(t.json_col->'emails') AS elem WHERE elem->>'id' = 123;

When I try to run the command: import psycopg2 I get the error: ImportError: dlopen(/Users/gwulfs/anaconda/lib/python2.7/site-packages/psycopg2/_psycopg.so, 2): Library not loaded: libssl.1.0.0.dylib Referenced from: /Users/gwulfs/anaconda/lib/python2.7/site-packages/psycopg2/_psycopg.so Reason: image not found So far I have tried brew install openssl and have referenced (with no luck): psycopg2 installation error - Library not loaded: libssl.dylib http://joshuakehn.com/2013/10/13/Postgresapp-and-psycopg2-on-OS-X.html Psycopg2 image not found Instead of playing with symlinks in system library