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What is an index in SQL?
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An index is used to speed up searching in the database. MySQL have some good documentation on the subject (which is relevant for other SQL servers as well):
http://dev.mysql.com/doc/refman/5.0/en/mysql-indexes.html
An index can be used to efficiently find all rows matching some c...
ZMQ: 基本原理 - 开源 & Github - 清泛网移动版 - 专注C/C++及内核技术
...。
本文的目的是解释ØMQ架构的基本概念，它们是如何组合起来的，以及它们被如此设计的原因。
拓扑
拓扑是ØMQ最主要的概念，除非你知道“拓扑”代表什么，否则将与其他概念混淆更难...
Run MySQLDump without Locking Tables
...ion, because it does not need to lock the tables at
all.
For innodb DB:
mysqldump --single-transaction=TRUE -u username -p DB
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How to find all tables that have foreign keys that reference particular table.column and have values
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For what kind of DB is this useful? MySql?
– Cirelli94
Jan 9 '18 at 10:56
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一个科技公司只是碰巧卖起了披萨？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...执行送餐，最高时速可达每小时12.5公里。顾客可以通过密码解锁，打开DRU自助取餐。
2016年4月，达美乐又推出新App一键下单——“一键”的意思是：“点开App，而不需任何其他操作”，10秒内倒计时确认非误操作，就会完成下...
How to find all the tables in MySQL with specific column names in them?
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@Echo - you can always play with mysqldump with --skip-extended-insert and then grep through the file... dirty but strangely satifying :)
– Ken
Oct 20 '11 at 17:35
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Doctrine - How to print out the real sql, not just the prepared statement?
...You can check the query executed by your app if you log all the queries in mysql:
http://dev.mysql.com/doc/refman/5.1/en/query-log.html
there will be more queries not only the one that you are looking for but you can grep for it.
but usually ->getSql(); works
Edit:
to view all the mysql quer...
mysql update column with value from another table
I have two tables, both looking like
8 Answers
8
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What is the difference between single and double quotes in SQL?
...ct_id
SELECT PRODUCT.id 'product_id'
Either works in Oracle, SQL Server, MySQL… but I know some have said that the TOAD IDE seems to give some grief when using the single quotes approach.
You do have to use single quotes when the column alias includes a space character, e.g., product id, but it...
Using DISTINCT and COUNT together in a MySQL Query
Is something like this possible:
7 Answers
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