Add List All Versions Of A Function as a postgres til.

2026-01-05 08:08:02 +00:00 · 2015-07-21 09:32:22 -05:00
parent e28a67a6db
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--- a/postgres/list-all-versions-of-a-function.md
+++ b/postgres/list-all-versions-of-a-function.md
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+# List All Versions Of A Function
+
+Within `psql` you can use `\df` to list a postgres function with a given
+name
+
+```sql
+> \df now
+                              List of functions
+   Schema   | Name |     Result data type     | Argument data types |  Type
+------------+------+--------------------------+---------------------+--------
+ pg_catalog | now  | timestamp with time zone |                     | normal
+(1 row)
+```
+
+When a function has multiple definitions across a number of types, `\df`
+will list all versions of that function
+
+```sql
+> \df generate_series
+List of functions
+-[ RECORD 1 ]-------+-------------------------------------------------------------------
+Schema              | pg_catalog
+Name                | generate_series
+Result data type    | SETOF bigint
+Argument data types | bigint, bigint
+Type                | normal
+-[ RECORD 2 ]-------+-------------------------------------------------------------------
+Schema              | pg_catalog
+Name                | generate_series
+Result data type    | SETOF bigint
+Argument data types | bigint, bigint, bigint
+Type                | normal
+-[ RECORD 3 ]-------+-------------------------------------------------------------------
+Schema              | pg_catalog
+Name                | generate_series
+Result data type    | SETOF integer
+Argument data types | integer, integer
+Type                | normal
+-[ RECORD 4 ]-------+-------------------------------------------------------------------
+Schema              | pg_catalog
+Name                | generate_series
+Result data type    | SETOF integer
+Argument data types | integer, integer, integer
+Type                | normal
+-[ RECORD 5 ]-------+-------------------------------------------------------------------
+Schema              | pg_catalog
+Name                | generate_series
+Result data type    | SETOF timestamp with time zone
+Argument data types | timestamp with time zone, timestamp with time zone, interval
+Type                | normal
+-[ RECORD 6 ]-------+-------------------------------------------------------------------
+Schema              | pg_catalog
+Name                | generate_series
+Result data type    | SETOF timestamp without time zone
+Argument data types | timestamp without time zone, timestamp without time zone, interval
+Type                | normal
+```