How to obtain the last element of the array in Postgres? I need to do it declaratively as I want to use it as a ORDER BY criteria. I wouldn't want to create a special PGSQL function for it, the less changes to the database the better in this case. In fact, what I want to do is to sort by the last word of a specific column containing mu...
I want to set the default search_path to something other than the "public" schema. But I only want to do this for a particular user. How can I accomplish this? ...
Is it possible to return groups as an associative array? I'd like to know if a pure SQL solution is possible. Note that I release that I could be making things more complex unnecessarily but this is mainly to give me an idea of the power of SQL. My problem: I have a list of words in the database that should be sorted alphabetically and ...
I have two tables. First with points, and second with polygons. I need to find out which points are in required polygon according to the attribute gid. Using query: SELECT table1.* FROM table1, table2 WHERE table2.gid=1 AND ST_Contains(table2.geom2, table1.geom1); What I get is empty table (only columns without data)... Tnx ...
I have a project that is build up from several OSGi bundles. One of them is a generic Database bundle that defines a DataSource that can be used throughout the project. The spring bean definition of this service is: <osgi:service interface="javax.sql.DataSource"> <bean class="org.postgresql.ds.PGPoolingDataSource"> <property...
Hello, I would like to use PostgreSQL locally on my computer and have installed it. I use Windows 7. I am not able to start the PostgreSQL-Server. When using the "Start Server"-program, I get the following output in the dos command window: Start DoCmd(net start postgresql-8.4)... System error 2 (my translation) System cannot find the...
Is there a better data type to be using to store a zlib compressed string in Postgresql? ...
In SQL Server I could copy sql code out of an application and paste it into SSMS, declare & assign vars that exist in the sql and run.. yay great debugging scenario. e.g. (please note I am rusty and syntax may be incorrect) declare @x as varchar(10) set @x = 'abc' select * from sometable where somefield = @x I want to do something si...
Whats the best way to use a SQL DB along side a NoSQL DB? I want to keep my users and other data in postgres but have some data that would be better suited for a NoSQL DB like redis. I see a lot of talk about switching to NoSQL but little talk on integrating it with existing systems. I think it would be foolish to throw the baby ou...
I've been experimenting with using fixture to load test data sets into my Pylons / PostgreSQL app. This works great except that it fails to properly create foreign keys if they reference an auto increment id field. My fixture looks like this: class AuthorsData(DataSet): class frank_herbert: first_name = "Frank" la...
I have populate a table using the copy from command which in turn will create record in summary table. While after the copy command successfully run, I can not see any record in the summary table. Anyone can shed some light on me? Pls find the table as well as the store procedure below:- CREATE TABLE apache_log ( log_name chara...
I'm thinking about moving from MySQL to Postgres for Rails development and I just want to hear what other developers that made the move have to say about it. I'm looking for personal experiences, not a Mysql v Postgres shootout, just the pros and cons that you yourself have arrived at. Stuff that folks might not necessarily think. Fe...
hi guys, How do i change the default listening port 5432 of postgresql to another number? Another question, What steps do i have do to allow remote r/w access to the database using python pyscopg2? ...
I want to find the first and the last occurrences of a specific character inside a string. As an example, consider a string named "2010-####-3434", and suppose the character to be searched for is "#". The first occurrence of hash inside the string is at 6-th position, and the last occurrence is at 9-th position. ...
I have a table in Pg like so CREATE TABLE t ( a BIGSERIAL NOT NULL, -- 8 b b SMALLINT, -- 2 b c SMALLINT, -- 2 b d REAL, -- 4 b e REAL, -- 4 b f REAL, -- 4 b g INTE...
What are the pros/cons from a performance/indexing/data management perspective of creating a one-to-one relationship between tables using the primary key on the child as foreign key, versus a pure surrogate primary key on the child? The first approach seems to reduce redundancy and nicely constrains the one-to-one implicitly, while the...
Ok my Giant friends once again I seek a little space in your shoulders :P Here is the issue, I have a python script that is fixing some database issues but it is taking way too long, the main update statement is this: cursor.execute("UPDATE jiveuser SET username = '%s' WHERE userid = %d" % (newName,userId)) That is getting called ab...
I am working with a large PostgreSQL database, and I am trying to tune it to get more performance. Our queries and updates seem to be doing a lot of lookups using foreign keys. What I would like is a relatively simple way to add Indexes to all of our foreign keys without having to go through every table (~140) and doing it manually. ...
I have BIG table with multiple indexes in postgres. It has indexes on db_timestamp, id, username. I want to find the MAX timestamp for particular username. The problem is the simple query like SELECT MAX(db_timestamp) FROM Foo WHERE username = 'foo' takes so much time because of the huge table size( we are talking 450GB table with o...
I am using Hibernate 3.3.2 in a fairly large project with PostgreSQL 8.4 using the PostgreSQLDialect. The way we have our relationships set up, we end up doing a lot of searching on the Foreign Key attributes of our tables. For performance reasons, I would like to have Hibernate add Indexes to the all of the foreign key columns when ...