Add List Databases And Tables as the first in mysql

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_534 TILs and counting..._
+_535 TILs and counting..._
 
 ---
 
@@ -28,6 +28,7 @@ _534 TILs and counting..._
 * [JavaScript](#javascript)
 * [Linux](#linux)
 * [Mac](#mac)
+* [MySQL](#mysql)
 * [Phoenix](#phoenix)
 * [PostgreSQL](#postgresql)
 * [Rails](#rails)
@@ -228,6 +229,10 @@ _534 TILs and counting..._
 - [List All The Say Voices](mac/list-all-the-say-voices.md)
 - [Resizing Both Corners Of A Window](mac/resizing-both-corners-of-a-window.md)
 
+### MySQL
+
+- [List Databases And Tables](mysql/list-databases-and-tables.md)
+
 ### Phoenix
 
 - [Bypass Template Rendering](phoenix/bypass-template-rendering.md)

mysql/list-databases-and-tables.md

@@ -0,0 +1,42 @@
+# List Databases And Tables
+
+If you've started a [mysql](https://dev.mysql.com/) session, but haven't
+connected to a particular database yet, you can list the available databases
+like so:
+
+```sql
+> show databases;
++-----------------------------+
+| Database                    |
++-----------------------------+
+| information_schema          |
+| my_app_dev                  |
++-----------------------------+
+```
+
+If you are curious about the tables in a particular database, you can list
+them by specifying the database's name:
+
+```sql
+> show tables in my_app_dev
++------------------------------+
+| Tables_in_my_app_dev         |
++------------------------------+
+| pokemons                     |
+| trainers                     |
++------------------------------+
+```
+
+Alternatively, you can connect to the database of interest and then there is
+no need to specify the name of the database going forward.
+
+```sql
+use my_app_dev;
+show tables;
++------------------------------+
+| Tables_in_my_app_dev         |
++------------------------------+
+| pokemons                     |
+| trainers                     |
++------------------------------+
+```