Create postgresql-commands.md

Author: shamimgeek

postgresql-commands.md

@@ -0,0 +1,27 @@
+**Connect database container**
+```
+docker exec -it postgres psql -U postgres
+[sakhtar@linux docker-compose-postgres]$ docker exec -it postgres psql -U postgres
+psql (12.4)
+Type "help" for help.
+
+postgres=# 
+```
+
+**List Database**
+```
+postgres=# \l
+                                 List of databases
+   Name    |  Owner   | Encoding |  Collate   |   Ctype    |   Access privileges   
+-----------+----------+----------+------------+------------+-----------------------
+ postgres  | postgres | UTF8     | en_US.utf8 | en_US.utf8 | 
+ shamim    | postgres | UTF8     | en_US.utf8 | en_US.utf8 | 
+ template0 | postgres | UTF8     | en_US.utf8 | en_US.utf8 | =c/postgres          +
+           |          |          |            |            | postgres=CTc/postgres
+ template1 | postgres | UTF8     | en_US.utf8 | en_US.utf8 | =c/postgres          +
+           |          |          |            |            | postgres=CTc/postgres
+(4 rows)
+
+postgres=# 
+
+```