ClickHouse/docs/es/sql-reference/table-functions/mysql.md
Ivan Blinkov d91c97d15d
[docs] replace underscores with hyphens (#10606)
* Replace underscores with hyphens

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---
machine_translated: true
machine_translated_rev: 3e185d24c9fe772c7cf03d5475247fb829a21dfa
toc_priority: 42
toc_title: mysql
---
# mysql {#mysql}
Permitir `SELECT` consultas que se realizarán en los datos que se almacenan en un servidor MySQL remoto.
``` sql
mysql('host:port', 'database', 'table', 'user', 'password'[, replace_query, 'on_duplicate_clause']);
```
**Parámetros**
- `host:port` — MySQL server address.
- `database` — Remote database name.
- `table` — Remote table name.
- `user` — MySQL user.
- `password` — User password.
- `replace_query` — Flag that converts `INSERT INTO` consultas a `REPLACE INTO`. Si `replace_query=1`, la consulta se reemplaza.
- `on_duplicate_clause` — The `ON DUPLICATE KEY on_duplicate_clause` expresión que se añade a la `INSERT` consulta.
Example: `INSERT INTO t (c1,c2) VALUES ('a', 2) ON DUPLICATE KEY UPDATE c2 = c2 + 1`, where `on_duplicate_clause` is `UPDATE c2 = c2 + 1`. See the MySQL documentation to find which `on_duplicate_clause` you can use with the `ON DUPLICATE KEY` clause.
To specify `on_duplicate_clause` you need to pass `0` to the `replace_query` parameter. If you simultaneously pass `replace_query = 1` and `on_duplicate_clause`, ClickHouse generates an exception.
Simple `WHERE` cláusulas tales como `=, !=, >, >=, <, <=` se ejecutan actualmente en el servidor MySQL.
El resto de las condiciones y el `LIMIT` La restricción de muestreo se ejecuta en ClickHouse solo después de que finalice la consulta a MySQL.
**Valor devuelto**
Un objeto de tabla con las mismas columnas que la tabla MySQL original.
## Ejemplo De Uso {#usage-example}
Tabla en MySQL:
``` text
mysql> CREATE TABLE `test`.`test` (
-> `int_id` INT NOT NULL AUTO_INCREMENT,
-> `int_nullable` INT NULL DEFAULT NULL,
-> `float` FLOAT NOT NULL,
-> `float_nullable` FLOAT NULL DEFAULT NULL,
-> PRIMARY KEY (`int_id`));
Query OK, 0 rows affected (0,09 sec)
mysql> insert into test (`int_id`, `float`) VALUES (1,2);
Query OK, 1 row affected (0,00 sec)
mysql> select * from test;
+------+----------+-----+----------+
| int_id | int_nullable | float | float_nullable |
+------+----------+-----+----------+
| 1 | NULL | 2 | NULL |
+------+----------+-----+----------+
1 row in set (0,00 sec)
```
Selección de datos de ClickHouse:
``` sql
SELECT * FROM mysql('localhost:3306', 'test', 'test', 'bayonet', '123')
```
``` text
┌─int_id─┬─int_nullable─┬─float─┬─float_nullable─┐
│ 1 │ ᴺᵁᴸᴸ │ 2 │ ᴺᵁᴸᴸ │
└────────┴──────────────┴───────┴────────────────┘
```
## Ver también {#see-also}
- [El MySQL motor de mesa](../../engines/table-engines/integrations/mysql.md)
- [Uso de MySQL como fuente de diccionario externo](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-sources.md#dicts-external_dicts_dict_sources-mysql)
[Artículo Original](https://clickhouse.tech/docs/en/query_language/table_functions/mysql/) <!--hide-->