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28 lines
751 B
Markdown
28 lines
751 B
Markdown
---
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toc_priority: 38
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toc_title: merge
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---
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# merge {#merge}
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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.
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**Syntax**
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```sql
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merge('db_name', 'tables_regexp')
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```
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**Arguments**
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- `db_name` — Possible values:
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- database name,
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- constant expression that returns a string with a database name, for example, `currentDatabase()`,
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- `REGEXP(expression)`, where `expression` is a regular expression to match the DB names.
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- `tables_regexp` — A regular expression to match the table names in the specified DB or DBs.
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**See Also**
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- [Merge](../../engines/table-engines/special/merge.md) table engine
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