psql

Background: I'm writing my first pgTAP test cases for a PL/pgSQL function and starting small with psql test scripts. No problems on that but I run into a small annoyance on psql variables . In my test scripts I first dump quite a bit of test data to a relevant tables and later refer to the data with a primary keys that were generated by sequences. I'd find it handy to be able to create a variable that would contain the primary key. This is what I'm looking for: scalasb=> \set the_id (select currval('id_data_id_seq')) scalasb=> \echo :the_id 54754 scalasb=> But this is what I get: scalasb=>

I want to know the time that it takes to execute a query in Postgres, I see a lot of response that propose to use \timing, but I'm newbie in Postgres and I don't know how to use it, can anyone help thank you in advance You can use \timing only with the command line client psql , since this is a psql command. It is a switch that turns execution time reporting on and off: test=> \timing Timing is on. test=> SELECT 42; ┌──────────┐ │ ?column? │ ├──────────┤ │ 42 │ └──────────┘ (1 row) Time: 0.745 ms test=> \timing Timing is off. 来源： https://stackoverflow.com/questions/40593723/how-to-use-timing

I found this related answer useful: Export "Create Aggregate" functions from PostgreSQL But how do I get the CREATE AGGREGATE statement without a GUI client (e.g. with psql command line)? a_horse_with_no_name Something like this, but I'm not sure if this covers all possible ways of creating an aggregate (it definitely does not take the need for quoted identifiers into account) SELECT 'create aggregate '||n.nspname||'.'||p.proname||'('||format_type(a.aggtranstype, null)||') (sfunc = '||a.aggtransfn ||', stype = '||format_type(a.aggtranstype, null) ||case when op.oprname is null then '' else ',

I googled a lot but.. How do I escape single quote in command line query of psql ? psql -t -A -F $'\t' postgresql://zzzz:5432/casedb -U qqqq -c 'select id,ext_ids ->> 'qwe' as qwe from data ORDER BY qwe' > /jdata/qwe.tab Results in error ERROR: column "qwe" does not exist LINE 1: select id,ext_ids ->> qwe as qwe from data... In Postgres you can use dollar-quoted strings : select id,ext_ids ->> $$qwe$$ as qwe from data ORDER BY qwe; -- or select id,ext_ids ->> $anything$qwe$anything$ as qwe from data ORDER BY qwe; You could just use double quotes ( " ) for the shell quoting and single quotes (

I am writing psql through Amazon Redshift and now I am trying to save the output as CSV through PSQL query, on SQL WorkBench The reason I am planning to do this through query instead of using select clause and then right click to save the output as csv, is because there are large amount of data, I found that if I generate the output into a temp table, it's much much faster than using select to display all the output. Therefore, I am thinking whether saving to local CSV can be faster too. I have tried the top solution here , however, it doesn't work on Amazon Redshift, When I am using Copy

I get a little confused some times when working with psql between when to use a set vs. \set vs. \pset . I think that: set is for session variables on my connection to the db. For example SET ROLE dba ; \set is for local variables for this psql session. For example \set time 'select current_timestamp' \pset is for psql settings for this psql session. For example '\pset border 2' But, I've never found what I thought was a good explanation of each. Are my assumptions above correct? I'm using PostgreSQL 9.4 Basically correct. The important difference is that SET is an SQL command while the other