1
vote
1answer
23 views

use variable to determine the name of a column in the select in postgre

I'm trying create a update for a new structure of tables from a old table, but not using functions. I'm trying create a script to it. The old table is like this: -- old table (OldTable) name| col_a | ...
1
vote
1answer
29 views

Delete rows while updating references

Suppose I have a person table with an id and some other columns. Other tables reference the person table using ON UPDATE CASCADE. for instance: CREATE TABLE person (id int PRIMARY KEY); CREATE TABLE ...
3
votes
2answers
65 views

Removing all columns with given name

I am converting a MSSQL schema to PostgreSQL and in that schema most tables have a column called Timestamp that are of MSSQL timestamp datatype which is effectively rowversion. When inserting records ...
1
vote
1answer
44 views

Upsert statement never completes, infinite loop?

Edit: The function works, tested it by creating a small table. So the problem must be with my input, but I still can't see what the issue is - unless the function is just incredibly slow. It's not a ...
0
votes
2answers
46 views

How to implement a dynamic string into a (prepared) sql statement?

I have some spatial datasets which are available in a open source metadata catalog software GeoNetwork and in a PostGIS database. The problem is that the student who created the database used ...
1
vote
2answers
138 views

How to make a table name an attribute in PostgreSQL?

I have received hundreds of tables in PostgreSQL with identical structure and each containing similar data of a different day, so that the table name is the date of the data. I would like to Union ...
1
vote
2answers
192 views

Dynamic UPDATE fails due to unwanted parenthesis around string in plpgsql

Using PostgreSQL 9.3.4 on Mac OSX 10.9.2 with Postgres.app. I want to apply a function to all columns in a table, specifically I want to trim white space. So far I've got this in a file test.sql: ...
2
votes
1answer
82 views

How to create function(table_name) that returns a set of the table

I have a set of tables that share the same fields (some timestamps and users names used for version control). I need to create a function with dynamic sql that uses a table_name and a timestamp as ...
0
votes
1answer
727 views

Using dynamic column names in PostgreSQL

I am using PostgreSSQL 8.3. I want to execute this query: select COALESCE(col_fr,col,'Unknown') from my_table where id = 'abc'; Twist in the story is column name colum_fr should be generated ...
2
votes
2answers
844 views

Postgresql: Query across schemas

I have multiple schemas that I need to query across. The schemas are not know in advance for example: U111 U222 U333 I need to select across these three schemas from a specific table in each of ...
2
votes
1answer
2k views

Are there other ways to select a dynamic list of columns?

I need to let my users specify the list of columns they want to select. So far I know two ways of accomplishing that. 1. Using refcursors CREATE OR REPLACE FUNCTION selecttestwithcolumnlist( ticker ...
2
votes
1answer
85 views

getting the output of delete statement in UDF in postgres

In Postgres in a user defined function I do execute format('delete from table where session_id = %L', id); ran without execute postgres (may) return(s) the following: DELETE 0 Is there any way I ...
1
vote
2answers
610 views

Dropping a group of schemas with similar name patterns

Consider a situation where one need to perform a bunch of essentially identical operations, with the only variable being the name of some object. In my case, I need to drop some schemas, all of the ...
1
vote
2answers
2k views

PostgreSQL stored procedure to return rows or empty set

I have a stored procedure, which RETURNS SETOF ct_custom_type and inside I do RETURN QUERY EXECUTE 'some dynamic query' And I want to do this: If this 'dynamic query' returns >= 10 rows, I want to ...
12
votes
1answer
9k views

Create index if it does not exist

I am working on a function that allows me to add an index if it does not exist. I am running into the problem that I cannot get a list of indexes to compare to. Any thoughts? This is a similar issue ...
2
votes
2answers
346 views

Bug in PL/pgSQL function creation

I don't know if this question better suits here or in SO ... This is a script that I'd like to launch (the code of the function was copied from a question on SO): \c mydb create or replace function ...
4
votes
2answers
2k views

Dynamic access to record column in plpgsql function

How can I address a column from a record in a plpgsql function dynamically? In the following snippet I have access to a variable entity.colname that contains the column that should be checked in the ...
4
votes
2answers
8k views

Postgres plpgsql - Using a variable inside of a dynamic create statement

Using Postgres pl/pgsql, I'm attempting to create a table using a dynamic EXECUTE command, such as: ... DECLARE tblVar varchar := "myTable"; BEGIN EXECUTE 'CREATE TABLE $1 ( foo ...