Add Who Is The Current User as a postgres til.

README.md

@@ -56,6 +56,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Timestamp Functions](postgres/timestamp-functions.md)
 - [Toggling The Pager In PSQL](postgres/toggling-the-pager-in-psql.md)
 - [Turning Timing On](postgres/turning-timing-on.md)
+- [Who Is The Current User](postgres/who-is-the-current-user.md)
 - [Word Count for a Column](postgres/word-count-for-a-column.md)
 
 ### rails

postgres/who-is-the-current-user.md

@@ -0,0 +1,21 @@
+# Who Is The Current User
+
+You can determine the current user of a psql session by selecting on the `current_user`
+
+```sql
+> select current_user;
+
+  current_user
+----------------
+   test_user
+```
+
+You can also select on the `user` which is an alias of `current_user`
+
+```sql
+> select user;
+
+     user
+----------------
+   test_user
+```