id,page,ref,title,content,breadcrumbs,references
sql_queries:id3,sql_queries,id3,Cross-database queries,"SQLite has the ability to run queries that join across multiple databases. Up to ten databases can be attached to a single SQLite connection and queried together. 
             Datasette can execute joins across multiple databases if it is started with the  --crossdb  option: 
             datasette fixtures.db extra_database.db --crossdb 
             If it is started in this way, the  /_memory  page can be used to execute queries that join across multiple databases. 
             References to tables in attached databases should be preceded by the database name and a period. 
             For example, this query will show a list of tables across both of the above databases: 
             select
  'fixtures' as database, *
from
  [fixtures].sqlite_master
union
select
  'extra_database' as database, *
from
  [extra_database].sqlite_master 
             Try that out here .","[""Running SQL queries""]","[{""href"": ""https://latest.datasette.io/_memory?sql=select%0D%0A++%27fixtures%27+as+database%2C+*%0D%0Afrom%0D%0A++%5Bfixtures%5D.sqlite_master%0D%0Aunion%0D%0Aselect%0D%0A++%27extra_database%27+as+database%2C+*%0D%0Afrom%0D%0A++%5Bextra_database%5D.sqlite_master"", ""label"": ""Try that out here""}]"