* split up select.md * array-join.md basic refactoring * distinct.md basic refactoring * format.md basic refactoring * from.md basic refactoring * group-by.md basic refactoring * having.md basic refactoring * additional index.md refactoring * into-outfile.md basic refactoring * join.md basic refactoring * limit.md basic refactoring * limit-by.md basic refactoring * order-by.md basic refactoring * prewhere.md basic refactoring * adjust operators/index.md links * adjust sample.md links * adjust more links * adjust operatots links * fix some links * adjust aggregate function article titles * basic refactor of remaining select clauses * absolute paths in make_links.sh * run make_links.sh * remove old select.md locations * translate docs/es * translate docs/fr * translate docs/fa * remove old operators.md location * change operators.md links * adjust links in docs/es * adjust links in docs/es * minor texts adjustments * wip * update machine translations to use new links * fix changelog * es build fixes * get rid of some select.md links * temporary adjust ru links * temporary adjust more ru links * improve curly brace handling * adjust ru as well * fa build fix * ru link fixes * zh link fixes * temporary disable part of anchor checks
3.1 KiB
machine_translated | machine_translated_rev | toc_priority | toc_title |
---|---|---|---|
true | 72537a2d52 |
42 | mysql |
mysql
Veriyor SELECT
uzak bir MySQL sunucusunda depolanan veriler üzerinde gerçekleştirilecek sorgular.
mysql('host:port', 'database', 'table', 'user', 'password'[, replace_query, 'on_duplicate_clause']);
Parametre
-
host:port
— MySQL server address. -
database
— Remote database name. -
table
— Remote table name. -
user
— MySQL user. -
password
— User password. -
replace_query
— Flag that convertsINSERT INTO
için sorgularREPLACE INTO
. Eğerreplace_query=1
, sorgu değiştirilir. -
on_duplicate_clause
— TheON DUPLICATE KEY on_duplicate_clause
eklenen ifadeINSERT
sorgu.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.
Basit WHERE
gibi maddeler =, !=, >, >=, <, <=
şu anda MySQL sunucusunda yürütülür.
Geri kalan şartlar ve LIMIT
örnekleme kısıtlaması, yalnızca MySQL sorgusu bittikten sonra Clickhouse'da yürütülür.
Döndürülen Değer
Orijinal MySQL tablosu ile aynı sütunlara sahip bir tablo nesnesi.
Kullanım Örneği
MySQL tablo:
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)
Clickhouse'dan veri seçme:
SELECT * FROM mysql('localhost:3306', 'test', 'test', 'bayonet', '123')
┌─int_id─┬─int_nullable─┬─float─┬─float_nullable─┐
│ 1 │ ᴺᵁᴸᴸ │ 2 │ ᴺᵁᴸᴸ │
└────────┴──────────────┴───────┴────────────────┘