mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-14 19:45:11 +00:00
89 lines
3.6 KiB
Markdown
89 lines
3.6 KiB
Markdown
---
|
|
slug: /en/engines/table-engines/special/merge
|
|
sidebar_position: 30
|
|
sidebar_label: Merge
|
|
---
|
|
|
|
# Merge Table Engine
|
|
|
|
The `Merge` engine (not to be confused with `MergeTree`) does not store data itself, but allows reading from any number of other tables simultaneously.
|
|
|
|
Reading is automatically parallelized. Writing to a table is not supported. When reading, the indexes of tables that are actually being read are used, if they exist.
|
|
|
|
## Creating a Table {#creating-a-table}
|
|
|
|
``` sql
|
|
CREATE TABLE ... Engine=Merge(db_name, tables_regexp)
|
|
```
|
|
|
|
## Engine Parameters
|
|
|
|
### db_name
|
|
|
|
`db_name` — Possible values:
|
|
- 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
|
|
|
|
`tables_regexp` — A regular expression to match the table names in the specified DB or DBs.
|
|
|
|
Regular expressions — [re2](https://github.com/google/re2) (supports a subset of PCRE), case-sensitive.
|
|
See the notes about escaping symbols in regular expressions in the "match" section.
|
|
|
|
## Usage {#usage}
|
|
|
|
When selecting tables to read, the `Merge` table itself is not selected, even if it matches the regex. This is to avoid loops.
|
|
It is possible to create two `Merge` tables that will endlessly try to read each others' data, but this is not a good idea.
|
|
|
|
The typical way to use the `Merge` engine is for working with a large number of `TinyLog` tables as if with a single table.
|
|
|
|
## Examples {#examples}
|
|
|
|
**Example 1**
|
|
|
|
Consider two databases `ABC_corporate_site` and `ABC_store`. The `all_visitors` table will contain IDs from the tables `visitors` in both databases.
|
|
|
|
``` sql
|
|
CREATE TABLE all_visitors (id UInt32) ENGINE=Merge(REGEXP('ABC_*'), 'visitors');
|
|
```
|
|
|
|
**Example 2**
|
|
|
|
Let's say you have an old table `WatchLog_old` and decided to change partitioning without moving data to a new table `WatchLog_new`, and you need to see data from both tables.
|
|
|
|
``` sql
|
|
CREATE TABLE WatchLog_old(date Date, UserId Int64, EventType String, Cnt UInt64)
|
|
ENGINE=MergeTree(date, (UserId, EventType), 8192);
|
|
INSERT INTO WatchLog_old VALUES ('2018-01-01', 1, 'hit', 3);
|
|
|
|
CREATE TABLE WatchLog_new(date Date, UserId Int64, EventType String, Cnt UInt64)
|
|
ENGINE=MergeTree PARTITION BY date ORDER BY (UserId, EventType) SETTINGS index_granularity=8192;
|
|
INSERT INTO WatchLog_new VALUES ('2018-01-02', 2, 'hit', 3);
|
|
|
|
CREATE TABLE WatchLog as WatchLog_old ENGINE=Merge(currentDatabase(), '^WatchLog');
|
|
|
|
SELECT * FROM WatchLog;
|
|
```
|
|
|
|
``` text
|
|
┌───────date─┬─UserId─┬─EventType─┬─Cnt─┐
|
|
│ 2018-01-01 │ 1 │ hit │ 3 │
|
|
└────────────┴────────┴───────────┴─────┘
|
|
┌───────date─┬─UserId─┬─EventType─┬─Cnt─┐
|
|
│ 2018-01-02 │ 2 │ hit │ 3 │
|
|
└────────────┴────────┴───────────┴─────┘
|
|
```
|
|
|
|
## Virtual Columns {#virtual-columns}
|
|
|
|
- `_table` — Contains the name of the table from which data was read. Type: [String](../../../sql-reference/data-types/string.md).
|
|
|
|
You can set the constant conditions on `_table` in the `WHERE/PREWHERE` clause (for example, `WHERE _table='xyz'`). In this case the read operation is performed only for that tables where the condition on `_table` is satisfied, so the `_table` column acts as an index.
|
|
|
|
**See Also**
|
|
|
|
- [Virtual columns](../../../engines/table-engines/special/index.md#table_engines-virtual_columns)
|
|
- [merge](../../../sql-reference/table-functions/merge.md) table function
|