mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-25 09:02:00 +00:00
28 lines
838 B
Markdown
28 lines
838 B
Markdown
---
|
|
slug: /en/sql-reference/table-functions/merge
|
|
sidebar_position: 130
|
|
sidebar_label: merge
|
|
---
|
|
|
|
# merge
|
|
|
|
Creates a temporary [Merge](../../engines/table-engines/special/merge.md) table. The table structure is taken from the first table encountered that matches the regular expression.
|
|
|
|
**Syntax**
|
|
|
|
```sql
|
|
merge(['db_name',] 'tables_regexp')
|
|
```
|
|
**Arguments**
|
|
|
|
- `db_name` — Possible values (optional, default is `currentDatabase()`):
|
|
- database name,
|
|
- constant expression that returns a string with a database name, for example, `currentDatabase()`,
|
|
- `REGEXP(expression)`, where `expression` 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](../../engines/table-engines/special/merge.md) table engine
|