This page refers to the
sql_table_nameparameter that is part of a view.
sql_table_namecan also be used as part of a join, described on this documentation page.
sql_table_namecan also be used as part of an Explore, described on this documentation page.
sql_table_name: table_name ;;
Default ValueThe name of the view
AcceptsA table name in your database
sql_table_name sets the table in your database that will be queried by a view. If you do not add a
sql_table_name Looker defaults to the name of the view.
In other words, this:
is logically equivalent to this:
It is quite common to fall back on this default behavior, and not use
sql_table_name. However, there are some major situations where it can be useful. First, in some cases you’ll simply want the view to have a different name than the underlying table, such as to clean up a messy table name:
Additionally, there are cases when a view needs to be based on a database or schema that is not in the database user’s default search path. You can then make references like this:
Joining two tables from different databases is called a federated join. Federated joins can be performed using Looker if the two databases are on the same SQL dialect, reside on the same physical machine, and are accessible from the same connection in Looker.
Under those conditions, you can create a federated join by specifying the database name of each table in the
sql_table_name parameter for that view:
Then join these views using the
If you want to join databases that are in different SQL dialects, we recommend replicating one database into the other so that you can pull all data from a single source.
If you want to join across two MySQL databases on separate machines, you can perform a federated join across both database connections by creating a
FEDERATED table using
CONNECTION. Essentially, you establish a connection to tables on a different server entirely in your MySQL database. See this MySQL documentation to learn more.
customers view rely on the
customer_1 table from the default schema:
customers view rely on the
customer_1 table from the
Tables Referenced By
view Must Be Accessible From The Current Connection
views are referenced by an
join parameter, which in turn is referenced by a model. The model determines which database connection is used (see
connection for model). Database connections themselves are defined in the Admin section of Looker. When you reference a table in the
sql_table_name parameter, the table needs to be accessible within the associated connection.
Unfriendly Table Names May Require Square Brackets
Some dialects require that table names that have unsupported characters, or “unfriendly” table names, be enclosed in square brackets. For example, the table name
Customers.PaymentInfo includes a period in the table name, which could be interpreted as a table called
PaymentInfo in the schema
Customers. You can enclose the table name in square brackets to correct this, as follows: