\dv Code language: SQL (Structured Query Language) ( sql ) 9) List users and their roles To list available views in the current database, you use the \dv command. \df Code language: SQL (Structured Query Language) ( sql ) 8) List available views To list available functions in the current database, you use the \df command. \dn Code language: SQL (Structured Query Language) ( sql ) 7) List available functions To list all schemas of the currently connected database, you use the \dn command. To describe a table such as a column, type, modifiers of columns, etc., you use the following command: \d table_name Code language: SQL (Structured Query Language) ( sql ) 6) List available schema Note that this command shows the only table in the currently connected database. To list all tables in the current database, you use \dt command: \dt Code language: SQL (Structured Query Language) ( sql ) To list all databases in the current PostgreSQL database server, you use \l command: \l Code language: SQL (Structured Query Language) ( sql ) 4) List available tables You are now connected to database "dvdrental" as user "postgres".ĭvdrental= # Code language: PHP ( php ) 3) List available databases The following command connects to dvdrental database under postgres user: postgres= # \c dvdrental If you omit the user parameter, the current user is assumed. Once you are connected to a database, you can switch the connection to a new database under a user specified by user. In case you want to use SSL mode for the connection, just specify it as shown in the following command: psql -U user -h host "dbname=db sslmode=require" Code language: SQL (Structured Query Language) ( sql ) 2) Switch connection to a new database If you want to connect to a database that resides on another host, you add the -h option as follows: psql -h host -d database -U user -W Code language: SQL (Structured Query Language) ( sql ) psql -d database -U user -WĬode language: SQL (Structured Query Language) ( sql )įor example, to connect to dvdrental database under postgres user, you use the following command: C:\Program Files\PostgreSQL\9.5\bin>psql -d dvdrental -U postgres -Wĭvdrental= # Code language: SQL (Structured Query Language) ( sql ) After pressing Enter PostgreSQL will ask for the password of the user. The following command connects to a database under a specific user. Otherwise you will always be selecting the first referenced node (in document order, starting from the root).Summary: in this tutorial, we give you a list of common psql commands that help you query data from the PostgreSQL database server faster and more effectively. Note also that once you are in the context of the matched element, you want to use relative paths to the child nodes. There's no need for a "loop": the second template matches identifier and will be applied in turn to all matched elements. I also tried creating a loop to go thru all the identifier elements,Ĭreate a new element and set its node value to the attribute value, I also tried creating a loop to go thru all the identifier elements, create a new element and set its node value to the attribute value, but i cant figure out the right syntax The element identifier changes its value to the value of the attribute value, and then the attribute value is deleted.īut the problem is i can figure out how to make a loop to do it to all the elements, i change the first element value (dummy) to its attribute value (value1), and the second one gets the first elements value (value1) also, instead of its value (value2)
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