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Does MySQL index foreign key columns automatically?
Does MySQL index foreign key columns automatically?
9 Answers
9
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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...常是 2个副本 + 1个仲裁。
说了这么多，还是来实战一下如何搭建高可用的mongodb集群：
首先确定各个组件的数量，mongos 3个， config server 3个，数据分3片 shard server 3个，每个shard 有一个副本一个仲裁也就是 3 * 2 = 6 个，总共需要...
select * vs select column
...the top of my head is when you want only the value of an indexed column in MySQL (for example, just to check for row existence), and you're using MyISAM storage engine, it'll grab the data from the MYI file, which could be in memory, and not even go to disk!
– Mike Sherov
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How to do a regular expression replace in MySQL?
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With MySQL 8.0+ you could use natively REGEXP_REPLACE function.
12.5.2 Regular Expressions:
REGEXP_REPLACE(expr, pat, repl[, pos[, occurrence[, match_type]]])
Replaces occurrences in the string expr that match the regular express...
How do I enlarge an EER Diagram in MySQL Workbench?
I am working on a moderately complex schema in MySQL Workbench, and the single page of the EER diagram is now full up. Does anyone know how to enlarge it to two or more pages?
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Is SQL syntax case sensitive?
Is SQL case sensitive. I've used MySQL and SQL Server which both seem to be case in-sensitive. Is this always the case? Does the standard define case-sensitivity?
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Find and Replace text in the entire table using a MySQL query
Usually I use manual find to replace text in a MySQL database using phpmyadmin. I'm tired of it now, how can I run a query to find and replace a text with new text in the entire table in phpmyadmin?
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Linux编译安装软件configure参数（持续更新） - 开源 & Github - 清泛网 - ...
...续更新）configure_paramPHP configure参数，Squid configure参数，MySQL configure参数，Postfix configure参数，Courier configure参数，Sasl2 configure参数 等。PHP configure参数：
./configure --prefix=/usr/local/php --with-gd=/usr/local/gd --with-jpeg-dir=/usr/local/jpeg --wit...
How to remove all MySQL tables from the command-line without DROP database permissions? [duplicate]
How do I drop all tables in Windows MySQL, using command prompt? The reason I want to do this is that our user has access to the database drops, but no access to re-creating the database itself, for this reason we must drop the tables manually. Is there a way to drop all the tables at once? Bear in ...
How to find a text inside SQL Server procedures / triggers?
...ation'
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE '%'+@Text+'%'
UNION
--Column names
SELECT
TABLE_SCHEMA AS 'Object Schema'
,COLUMN_NAME AS 'Object Name'
,'COLUMN' AS 'Object Type'
,'Column Name' AS 'TEXT Location'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE C...