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slug | sidebar_position | sidebar_label |
---|---|---|
/en/sql-reference/table-functions/merge | 130 | merge |
merge
Creates a temporary Merge table. The table structure is taken from the first table encountered that matches the regular expression.
Syntax
merge(['db_name',] 'tables_regexp')
Arguments
-
db_name
— Possible values (optional, default iscurrentDatabase()
):- database name,
- constant expression that returns a string with a database name, for example,
currentDatabase()
, REGEXP(expression)
, whereexpression
is a regular expression to match the DB names.
-
tables_regexp
— A regular expression to match the table names in the specified DB or DBs.
See Also
- Merge table engine