Add List Databases Available For Connecting as a Postgres til

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1182 TILs and counting..._
+_1183 TILs and counting..._
 
 ---
 
@@ -609,6 +609,7 @@ _1182 TILs and counting..._
 - [List All Versions Of A Function](postgres/list-all-versions-of-a-function.md)
 - [List Available Schemas](postgres/list-available-schemas.md)
 - [List Connections To A Database](postgres/list-connections-to-a-database.md)
+- [List Databases Available For Connecting](postgres/list-databases-available-for-connecting.md)
 - [List Database Objects With Disk Usage](postgres/list-database-objects-with-disk-usage.md)
 - [List Database Users](postgres/list-database-users.md)
 - [List Various Kinds Of Objects](postgres/list-various-kinds-of-objects.md)

postgres/list-databases-available-for-connecting.md

@@ -0,0 +1,29 @@
+# List Databases Available For Connecting
+
+I tend to have a couple different versions of Postgres installed on my
+development machine. Each server version tends to have a different set of
+databases. As I switch between projects and Postgres versions, it can be hard
+to remember the name of the database to which I want to connect when using
+`psql`.
+
+I usually connect to one of the defaults, which is either named `postgres` or
+named after the machine user.
+
+There is a better way. I can first ask `psql` to list all the available
+databases.
+
+```
+❯ psql --list
+Timing is on.
+                                               List of databases
+              Name              |   Owner    | Encoding |   Collate   |    Ctype    |     Access privileges
+--------------------------------+------------+----------+-------------+-------------+---------------------------
+ jbranchaud                     | jbranchaud | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
+ postgres                       | jbranchaud | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
+ thirty_days_server_development | jbranchaud | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
+ thirty_days_server_test        | jbranchaud | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
+(4 rows)
+```
+
+Then I know before connecting which one I'm looking for or if it must be in the
+data directory of another Postgres server version.