大约有 40,000 项符合查询结果(耗时:0.0309秒) [XML]

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How to define a custom ORDER BY order in mySQL

In MySQL how do I define a custom sorting order. 4 Answers 4 ...
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MySQL - force not to use cache for testing speed of query

I'm testing the speed of some queries in MySQL. The database is caching these queries making it difficult for me to get reliable results when testing how fast these queries are. ...
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Deep Learning(深度学习)学习笔记整理系列之(四) - 大数据 & AI - 清泛...

...,这个AutoEncoder还不能用来分类数据,因为它还没有学习如何去连结一个输入和一个类。它只是学会了如何去重构或者复现它的输入而已。或者说,它只是学习获得了一个可以良好代表输入的特征,这个特征可以最大程度上代表...
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Delete with Join in MySQL

...ect_id = posts.project_id AND projects.client_id = :client_id; BTW, with mysql using joins is almost always a way faster than subqueries... share | improve this answer | fo...
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Illegal mix of collations MySQL Error

...E your_table_name CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; MySQL sneaks swedish in there sometimes for no sensible reason. share | improve this answer | follo...
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Limit results in jQuery UI Autocomplete

... If the results come from a mysql query, it is more efficient to limit directly the mysql result: select [...] from [...] order by [...] limit 0,10 where 10 is the max numbers of rows you want ...
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Why is it bad style to `rescue Exception => e` in Ruby?

... You can also ADAPTER_ERRORS = [::ActiveRecord::StatementInvalid, PGError, Mysql::Error, Mysql2::Error, ::ActiveRecord::JDBCError, SQLite3::Exception] and then rescue *ADAPTER_ERRORS => e – j_mcnally Feb 27 '14 at 2:19 ...
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How Scalable is SQLite? [closed]

I recently read this Question about SQLite vs MySQL and the answer pointed out that SQLite doesn't scale well and the official website sort-of confirms this , however. ...
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FIND_IN_SET() vs IN()

...ould even use an index on companyID. Unfortunately, this does not work in MySQL since the latter does not support arrays. You may find this article interesting (see #2): 10 things in MySQL (that won’t work as expected) Update: If there is some reasonable limit on the number of values in the...
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Set NOW() as Default Value for datetime datatype?

... As of MySQL 5.6.5, you can use the DATETIME type with a dynamic default value: CREATE TABLE foo ( creation_time DATETIME DEFAULT CURRENT_TIMESTAMP, modification_time DATETIME ON UPDATE CURRENT_TIMESTAMP ) Or even...