List stored functions that reference a table in PostgreSQL

Question

Just a quick and simple question: in PostgreSQL, how do you list the names of all stored functions/stored procedures using a table using just a SELECT statement, if possible

Answer 1

SELECT  p.proname
FROM    pg_catalog.pg_namespace n
JOIN    pg_catalog.pg_proc p
ON      p.pronamespace = n.oid
WHERE   n.nspname = 'public';

Answer 2

Have a look at my recipe. It reads functions and triggers. It is based on informations from: Extracting META information from PostgreSQL (INFORMATION_SCHEMA)

Answer 3

Excluding the system stuff:

select proname from pg_proc where proowner <> 1;

Answer 4

Please change the schema_name and table_name in the below query:

SELECT n.nspname AS schema_name
     , p.proname AS function_name
     , pg_get_function_arguments(p.oid) AS args
     , pg_get_functiondef(p.oid) AS func_def
FROM   pg_proc p
JOIN   pg_namespace n ON n.oid = p.pronamespace
AND    n.nspname = 'schema_name'
AND    p.prosrc like '%table_name%'

Since the table name is case sensitive, so need to define the exact table name.

Answer 5

Same as @quassnoi and @davidwhthomas, except I added the argument names in there:

SELECT  proname, proargnames, prosrc 
FROM    pg_catalog.pg_namespace n
JOIN    pg_catalog.pg_proc p
ON      pronamespace = n.oid
WHERE   nspname = 'public';

If the purpose behind listing the functions is to clean them up or iterate a new function with a changing params list, you will frequently need to drop functions:

DROP FUNCTION <name>(<args>);

By adding proargnames, I am able to construct the applicable function name for the drop.

Additionally, it's nice to see a more complete picture when evaluating the functions.

Answer 6

If you are using psql, try \df

From the man page:

Tip
To look up functions taking arguments or returning values of a specific type, use your pager's search capability to scroll through the \df output.

Running \set ECHO_HIDDEN will reveal what \df is running behind the scenes.