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

README.md

@@ -66,6 +66,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Intervals Of Time By Week](postgres/intervals-of-time-by-week.md)
 - [Limit Execution Time Of Statements](postgres/limit-execution-time-of-statements.md)
 - [List All Columns Of A Specific Type](postgres/list-all-columns-of-a-specific-type.md)
+- [List All Versions Of A Function](postgres/list-all-versions-of-a-function.md)
 - [Send A Command To psql](postgres/send-a-command-to-psql.md)
 - [Special Math Operators](postgres/special-math-operators.md)
 - [String Contains Another String](postgres/string-contains-another-string.md)

postgres/list-all-versions-of-a-function.md

@@ -0,0 +1,57 @@
+# 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
+```