Documentation Home
MySQL 8.0 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 46.1Mb
PDF (A4) - 46.1Mb
PDF (RPM) - 41.5Mb
HTML Download (TGZ) - 10.6Mb
HTML Download (Zip) - 10.6Mb
HTML Download (RPM) - 9.1Mb
Man Pages (TGZ) - 220.4Kb
Man Pages (Zip) - 325.8Kb
Info (Gzip) - 4.1Mb
Info (Zip) - 4.1Mb
Excerpts from this Manual

13.8.4 USE Syntax

USE db_name

The USE db_name statement tells MySQL to use the db_name database as the default (current) database for subsequent statements. The database remains the default until the end of the session or another USE statement is issued:

USE db1;
SELECT COUNT(*) FROM mytable;   # selects from db1.mytable
USE db2;
SELECT COUNT(*) FROM mytable;   # selects from db2.mytable

The database name must be specified on a single line. Newlines in database names are not supported.

Making a particular database the default by means of the USE statement does not preclude accessing tables in other databases. The following example accesses the author table from the db1 database and the editor table from the db2 database:

USE db1;
SELECT author_name,editor_name FROM author,db2.editor
  WHERE author.editor_id = db2.editor.editor_id;