fb: mysql cheats

Facebook/command_line_cheat_sheet.md

@@ -26,3 +26,9 @@ buck test @mode/dev-nosan local/path/... | run all tests
 ondemand devdb new              | new dev DB
 ondemand devdb list             | list dev DBs
 ondemand devdb connect --name <name of the ephemeral xdb shard> | connect to dev DB
+
+# MySQL
+SHOW DATABASES;                 |
+-|-
+SHOW DATABASES LIKE 'open%';    |
+SHOW SCHEMAS;                   |