PL/pgSQL is the default procedural language for the PostgreSQL database system. Questions about PL/pgSQL should probably be tagged "PostgreSQL" as well.

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Can I find errors without using testing data for all the branches of each function?

In PostgreSQL, syntax errors (except for trivial syntax errors) are reported while running the code in question; unlike Oracle, PostgreSQL can't find errors without running the part of the code. This ...
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Return several values from a PL/pgSQL procedure - to speed up the query

I have a non-forking game daemon written in Perl, which uses acync queries to write player stats into a PostgreSQL 9.3 database. But when I need to read something from database (like if a player is ...
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289 views

Conditonally create temporary table

Invoking the following SQL leads to a warning 'column "s" has type "unknown"' which I can understand. What I'm trying to accomplish is to conditionally create a temporary in preparation of running a ...
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Is this inconsistent treatment of `void` return from sql and plpgsql functions documented?

begin; create table foo(id integer); create function f1() returns void language sql as $$delete from foo;$$; create function f2() returns void language plpgsql as $$begin delete from foo; end;$$; ...
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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: ...
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PL/pgSQL fuction to find circular references

I have two tables ID Task 1 1 2 2 3 3 4 4 Col1 depend 2 3 2 4 3 1 4 2 ID and Col1 are related through FK constraint. I want to find out all circular references. Here ID ...
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1answer
659 views

Assign result of regexp_split_to_array() to Pl/pgSQL array variable

How do I create an array and then put a result of a function into it? I'm doing it like this: array text[]; select regexp_split_to_array('whatever this is it splits into array with spaces', E'\\s+') ...
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281 views

Access table field on creating a trigger postgresql

How can I access table field on creating a trigger? CREATE TRIGGER foo_trigger AFTER INSERT OR UPDATE OR DELETE ON foo FOR EACH ROW EXECUTE PROCEDURE proc(foo.field);//here goes the parameter
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ERROR: loop variable of FOREACH must be a known variable or list of variables

I have few FOREACH loops in my functions. The loops seem to perfectly agree with the official postgresql documentation. This error message is returned: ERROR: loop variable of FOREACH must be a known ...
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1answer
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I have an INSTEAD OF trigger, but PostgreSQL still complains while I insert into view

I have created a view and an INSTEAD OF trigger for inserting/ updating/ deleting from that view. Now I have tried to insert some data to the view, and PostgreSQL returns following error (translation ...
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1answer
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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 ...
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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 ...
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1answer
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RETURN NEXT in Postgres Function

I'm currently writing a plpgsql function that will select from a table and produce a substantial amount of data. I was originally going to return an array, but I found a resource that explains the ...
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2answers
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Query across multiple schemas, unknown until execution time

I have multiple schemas that I need to query across. The schemas are not known in advance, for example: U111 U222 U333 I need to select across these three schemas from a specific table in each of ...
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2answers
585 views

How to do WHERE x IN (val1, val2,…) in plpgsql

I would like to update a selection of rows in a table; this works... UPDATE t1 SET col1 = 'newvalue' WHERE col0 in (2, 4, 5); But how can I do the same in a plpgsql function? The following gives a ...
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1answer
798 views

How to access NEW or OLD field given only the field's name?

I'm writing a validation trigger. The trigger must validate that the sum of an array equals another field. Since I have many instances of this validation, I want to write a single procedure and create ...
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327 views

Basic trigger in PL/pgSQL, to flip a boolean field if another field has text

I want a BOOLEAN field to be set to TRUE when a sibling TEXT field is set to a non-empty string. Vice versa, the BOOLEAN is set to FALSE when TEXT field is set to empty string. The following function ...
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1answer
349 views

Self-join unique pairs

I have a table (players) containing a list of players, I would like to pair up these players in a unique way, so that every player's opponent is unique every round (ie. every time the SELECT query is ...
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1answer
966 views

What PL/pgSQL debugger can I use?

I'm building a lot of PL/pgSQL functions and a debugger would really come in handy because RAISE NOTICE is not enough. I read about a pgAdmin plugin you can install but it was only on Windows and I'm ...
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845 views

Insert RECORD into a table in a trigger function

I would like to insert a RECORD data type variable (NEW variable) into a table in a trigger. What would the SQL look like? The following attempts were unsuccessful: EXECUTE 'INSERT INTO my_table ...
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1answer
872 views

How to get query runtime in PL/pgSQL to be as fast as console query runtime?

Basically I want to assign the result of a query to a custom type attribute. However I noticed that querying directly from the PostgreSQL console was about 0.071 ms and inside the function was 0.400 ...
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988 views

How to correctly return a query result only if it isn't NULL?

I'm writing a PL/pgSQL function that creates a cursor for a query that I need to check whether it returns something. What I'm doing is this: Run the query Check whether it returns something. If it ...
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Call multiple functions from trigger?

I run PostgreSQL-9.2.4 Is it possible to call 2 functions from a trigger? Let's say I have two functions for two different tables to be executed if following trigger fires: Trigger: CREATE TRIGGER ...
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1answer
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Postgres function assign query results to multiple variables

I need to assign values to 2 variable as below in Postgres function. a := select col1 from tbl where ... b := select col2 from tbl where ... How can I assign 2 values to 2 variables in one line ...
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Automatic conversion of anonymous records returned from an UDF to well known table-type

Proprietary code (that we cannot change) has a bunch of user defined functions of the type: create or replace function f() returns record as $$ ... $$ which we call in the following way (for ...
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Insert values from a record variable into a table

I am developing a user-defined function that takes two arguments: create or replace function gesio( events_table_in regclass, events_table_out regclass) returns void as $$ ... $$ ...
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How can I use an environment variable in a Postgres function?

Let's say I have a windows user environment variable SOME_STRING. Is it possible to use its value in a PL/pgSQL function? If not, do I need to use an untrusted language (like PL/pythonu) or can I ...
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1answer
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SQL injection in Postgres functions vs prepared queries

In Postgres, are prepared queries and user defined functions equivalent as a mechanism for guarding against SQL injection? Are there particular advantages in one approach over the other?
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Assign values with the := operator

When I assign a variable with result := title || '', by '' || author; it is taking more time (approx. 15 sec) to run the function. However, when I assign the variable with result = title || '', by ...
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2answers
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Trigger update does not seem to finish

I'm new to PostgreSQL triggers & functions and such. I've got a table: keywords and each keyword should be unique. So when I try to insert a keyword that already exists, it should simply update ...
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Convert units of measurement

Looking to calculate the most suitable unit of measurement for a list of substances where the substances are given in differing (but compatible) unit volumes. Unit Conversion Table The unit ...
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Postgresql function to create table

I want to create a function in order to create a table with a specific structure pasing part of the name of the table as an argument so the name of the table is t_ . Similar to this: CREATE OR ...
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1answer
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PostgreSQL stored function that returns arbitrary resultset

I would like to write a PostgreSQL stored function that essentially behaves like the stored procedures I know and love from MSSQL and MySQL where I can just wrap a query that takes no parameters and ...
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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 ...
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1answer
579 views

How to turn off all RAISE NOTICE on production server?

I put a lot of RAISE NOTICE in functions for debugging purpose. I think this will affect performance, so they should be removed on production environment. Is there any way to opt-out those ...
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1answer
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How to use array variable in query in PostgreSQL

Create table t1 ( xcheck varchar[], name text ); CREATE OR REPLACE FUNCTION fn_acgroup(xch varchar[]) RETURNS record AS DECLARE xrc as record; execute 'select name from t1 where xcheck @> ...
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1answer
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Error: set_valued function called in context that cannot accept a set. What is it about?

I use Postgresql 9.1, with ubuntu 12.04. Inspired by Craig's answer to my question Concatenation of setof type or setof record I thought I would go well with using return query, setof record, and a ...
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1answer
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Concatenation of setof type or setof record

I use Postgresql 9.1 with Ubuntu 12.04. In a plpgsql function I try to concatenate setof type returned from another function. the type pair_id_value in question is created with create type ...
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1answer
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How to access the number of rows accumulated by RETURNs in PL/pgSQL

When performing RETURN QUERY ... in a PL/pgSQL function, is it possible afterwards to directly access the number of rows accumulated into the pile of records, which are returned when the function ...
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Special syntax sth.name() in the CREATE FUNCTION statement, what does it mean?

In this SO question about stored procedures in plpgsql, the stored procedure look like sth.name(). I don't know what is the meaning of the prefix sth. For example: create or replace function ...
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Recursive query using plpgsql

I'm trying to write a plpgsql function that recursively returns a set of columns from records in a tree structure. I have a data table and a table to link the data together: DATATABLE ----------- id ...
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1answer
1k views

Difference between return next and return record

What is the difference between RETURN NEXT and RETURN RECORD in PL/pgSQL? I find the manual quite confusing in explaining what RETURN RECORD actually does. What is a RECORD type?
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returning set of records in stored procedure

I would like to return a set of records from a pl/pgsql. Is there a way to do that without using the "for" construct and cursors? For instance when I compared these two stored procedures: create or ...
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1answer
6k views

Declare variable of table type in PL/pgSQL

I am wondering if there is a way to declare a variable of type table in PL/pgSQL to hold query results? For instance how can I express something like: q1 = select * from foo; q2 = select * from bar; ...
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2answers
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String handling in postgres 8.4

This started as a question about indexes, but then when I got my answer I realized I would have to try and convert the answer into 8.4 syntax (I can't believe that format does not exist). I thought I ...
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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 ...
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PostgreSQL 8.4: How to tell if a procedural language is installed or not?

I have a setup program that requires plpgsql to install stored procedures in a PostgreSQL 8.4 database. I need to make sure the language is installed or the app will fail. I don't want to drop the ...
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Interactive INSERT / UPDATE function to implement UPSERT

I have a function in PostgreSQL 9.1 that I want client applications to be passing a record object and the function will detect if it's an insert or an update and return the operation done, i.e "1 ...
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Issue with composite type in an UPSERT function

I have a function in PostgreSQL 9.1 called fun_test. It has a composite type as input parameter and I keep getting a casting error when I call it. CREATE OR REPLACE FUNCTION netcen.fun_test(myobj ...
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Save output from multiple SQL SELECT commands to a file

Within a Postgres function I would like to run a number of SQL SELECT commands and append the output to the same variable. After all the SELECT commands have run this output should be written to a ...