set-returning-functions

I'm new to Postgres and have a database with multiple tables of the same structure. I need to select data from each table that matches certain criteria. I could do this with a bunch of UNION queries, but the number of tables I need to search can change over time, so I don't want to hard code it like that. I've been trying to develop a function that will loop through specific tables (they have a common naming convention) and return a table of records, but I'm not getting any results when I query the function. Function code is below: CREATE OR REPLACE FUNCTION public.internalid_formaltable_name

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

I have a table which stores account changes over time. I need to join that up with two other tables to create some records for a particular day, if those records don't already exist. To make things easier (I hope), I've encapsulated the query that returns the correct historical data into a function that takes in an account id, and the day. If I execute "Select * account_servicetier_for_day(20424, '2014-08-12')" , I get the expected result (all the data returned from the function in separate columns). If I use the function within another query, I get all the columns joined into one: ("2014-08

Suppose I have a table like this: subject | flag ----------------+------ this is a test | 2 subject is of type text , and flag is of type int . I would like to transform this table to something like this in Postgres: token | flag ----------------+------ this | 2 is | 2 a | 2 test | 2 Is there an easy way to do this? In Postgres 9.3+ use a LATERAL join: SELECT s.token, flag FROM tbl t, unnest(string_to_array(t.subject, ' ')) s(token) WHERE flag = 2; Note that the shorthand form of a LATERAL join only returns rows, if unnest() actually returns row(s). You could also use regexp_split_to_table() ,

I'm experimenting with keeping values like the following in a Postgres jsonb field in Postgres 9.4: [{"event_slug":"test_1","start_time":"2014-10-08","end_time":"2014-10-12"}, {"event_slug":"test_2","start_time":"2013-06-24","end_time":"2013-07-02"}, {"event_slug":"test_3","start_time":"2014-03-26","end_time":"2014-03-30"}] I'm executing queries like: SELECT * FROM locations WHERE EXISTS ( SELECT 1 FROM jsonb_array_elements(events) AS e WHERE ( e->>'event_slug' = 'test_1' AND ( e->>'start_time' >= '2014-10-30 14:04:06 -0400' OR e->>'end_time' >= '2014-10-30 14:04:06 -0400' ) ) ) How would I

My last question Passing an array to stored to postgres was a bit unclear. Now, to clarify my objective: I want to create an Postgres stored procedure which will accept two input parameters. One will be a list of some amounts like for instance (100, 40.5, 76) and the other one will be list of some invoices ('01-2222-05','01-3333-04','01-4444-08') . After that I want to use these two lists of numbers and characters and do something with them. For example I want to take each amount from this array of numbers and assign it to corresponding invoice. Something like that in Oracle would look like