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More explain select related news:
MySQL的ORDER BY索引优化 uh80.com 2 Mar 2013 | 07:20 am
生成环境中会用到各种排序，通过执行 EXPLAIN SELECT … ORDER BY，就知道MySQL是否在查询中使用了索引。如果 Extra 字段的值是 Using filesort，则说明MySQL无法使用索引。 MySQL索引通常是被用于提高WHERE条件的数据行匹配或者执行联结操作时匹配其它表的数据行的搜索速度。 MySQL也能利用索引来快速地执行ORDER BY和GROUP BY语句的...
高效的MySQL分页 086php.com 26 Oct 2012 | 07:41 am
PERCONA PERFORMANCE CONFERENCE 2009上，来自雅虎的几位工程师带来了一篇”Efficient Pagination Using MySQL“的报告，有很多亮点，本文是在原文基础上的进一步延伸。 首先看一下分页的基本原理： mysql> explain SELECT * FROM message ORDER BY id DESC LIMIT 10000, 20\G...
高效的MySQL分页 leo108.com 6 May 2013 | 05:33 pm
PERCONA PERFORMANCE CONFERENCE 2009上，来自雅虎的几位工程师带来了一篇”Efficient Pagination Using MySQL“的报告，有很多亮点，本文是在原文基础上的进一步延伸。 未经允许严禁转载 首先看一下分页的基本原理： http://leo108.com/pid-1914.asp mysql> explain SELECT * FROM m...
Mysql 优化之 Explain im87.net 25 Jul 2013 | 05:04 pm
语法 1 EXPLAIN < TABLE_NAME > 例如: 1 EXPLAIN SELECT * FROM t3 WHERE id=3952602; 借助于EXPLAIN，你可以知道 1)你什么时候必须为表加入索引以得到一个使用索引找到记录的更快的SELECT。 2)你也能知道优化器是否以一个最佳次序联结表。为了强制优化器对一个SELECT语句使用一个特定联结次序，增加一个ST...
Advertisers still obsessed with click-throughs -- ZDNet purpleclick.com 28 Oct 2011 | 04:27 pm
The onus is on the advertiser to select a manageable range of appropriate metrics that will most accurately measure the achievements of the campaigns against the goals they have set, he added. Leonar...
HDTV (High Definition Television) Explained newwavecom.com 11 Feb 2012 | 09:28 am
HDTV is the popular acronym for High Definition Television, which is a way of broadcasting video in digital format, whereby the signal is sent in the form of zeros and ones instead of the waves used i...
Wordless Wednesday #8 kokoro-no-haiku.blogspot.com 29 Jun 2011 | 04:01 am
On Wednesdays all over the internet, bloggers post a photograph with no words to explain it on their blog. Hence the ‘wordless’ title. The idea is that the photo itself says so much that it doesn’t ne...
Wordless Wednesday #7 kokoro-no-haiku.blogspot.com 22 Jun 2011 | 04:45 am
On Wednesdays all over the internet, bloggers post a photograph with no words to explain it on their blog. Hence the ‘wordless’ title. The idea is that the photo itself says so much that it doesn’t ne...
Wordless Wednesday #6 kokoro-no-haiku.blogspot.com 15 Jun 2011 | 09:38 pm
On Wednesdays all over the internet, bloggers post a photograph with no words to explain it on their blog. Hence the ‘wordless’ title. The idea is that the photo itself says so much that it doesn’t ne...
Wordless Wednesday #5 kokoro-no-haiku.blogspot.com 8 Jun 2011 | 04:57 pm
On Wednesdays all over the internet, bloggers post a photograph with no words to explain it on their blog. Hence the ‘wordless’ title. The idea is that the photo itself says so much that it doesn’t ne...
