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MySQL database sql statement commonly used optimization methods 1. Query optimization, should try to avoid full table scan, should first consider where and order by the columns involved in the establishment of the index. 2. Should be avoided in the where clause on the field null value judgment, otherwise it will cause the engine to abandon the use of indexes and full table scan, such as: select id from t where num is null You can set the default value of num 0, to ensure that Num column table does not null value ...

1, MySQL exists text and blob: (1), the same in the text or BLOB column storage or retrieval process, there is no case conversion, when not running in strict mode, if you assign a BLOB or text column exceeds the maximum length of the column type value, the value is intercepted to ensure that the appropriate. If the truncated character is not a space, a warning is generated. Using strict SQL mode produces an error, and the value is rejected rather than intercepted and given a warning. Blob and text columns cannot have default values. When a blob is saved or retrieved ...

"Csdn Live Report" December 2014 12-14th, sponsored by the China Computer Society (CCF), CCF large data expert committee contractor, the Chinese Academy of Sciences and CSDN jointly co-organized to promote large data research, application and industrial development as the main theme of the 2014 China Data Technology Conference (big Data Marvell Conference 2014,BDTC 2014) and the second session of the CCF Grand Symposium was opened at Crowne Plaza Hotel, New Yunnan, Beijing. Star Ring Technology CTO Sun Yuanhao ...

December 2014 12-14th, hosted by the China Computer Society (CCF), CCF Large data Experts committee, the Chinese Academy of Sciences and CSDN co-organizer, to promote large data research, application and industrial development as the main theme of the 2014 China Data Technology conference? (Big Data Marvell Conference 2014,BDTC 2014) and the second session of the CCF Grand Conference in Beijing new Yunnan Crowne Plaza grand opening. Star Ring Technology CTO Sun Yuanhao's keynote address is "2015 ...

In this lesson, we want to learn how to increase the intelligent processing capacity of the Web page. Basic functions Welcome to the third and final lesson of this tutorial. If you've learned the first and second lessons, you've mastered the basics of installing and programming MySQL and PHP. Here are some of the other functions of PHP that might be useful to you and make your development process simpler. 　　First, let's look at the document. You should know some basic concepts of the header file, right? The header file is an external file whose contents are included in the main program. ...

1, use the index to traverse the table faster. The index created by default is a non-clustered index, but sometimes it is not optimal. Under non-clustered indexes, the data is physically stored on the data page. Reasonable index design should be based on the analysis and prediction of various inquiries. In general: a. A large number of duplicate values, and often range query (>, <,> =, <=) and order by, group by occurred column, consider the establishment of cluster index; b. Column, ...

Recently, the domestic well-known cms/shop system developers Easy Network released its march. NET platform's flagship product: Sitefactory Cms/eshop 1.0. May be because of the popularity of the dynamic CMS is too high, so it's shop system has not been very good to promote, nor was the vast number of netizens webmaster good understanding. In fact, moving easily eshop products is absolutely a very powerful online shop system, not more than shopex such a professional only do shop system products inferior to a few, while in the CMS section, moving Easy eshop ...

The intermediary transaction SEO diagnoses Taobao guest cloud host Technology Hall constructs the station to me this communication profession person is a very accidental thing, my job is to engage in the telecommunication equipment, is also the switchboard, the router, the ATM switch, the optical fiber transmission these, but is far away from the application layer. At the end of 2003, I moved to a new house, just met a neighbor of my age recommended a game: Counter Strike. I am not very interested in this game, I do not play CS until now. I found that a lot of people play CS, at that time the forum dedicated to exchange CS very few ...

Accwiz.exe > Accessibility Wizard for walking you through setting the up your the for machine your. Accessibility Wizard Acsetups.exe > ACS setup DCOM server executable actmovie.exe > Direct Sh ...

Recently, the first China CIO annual meeting held in Beijing. The CIO's annual meeting with the "new technology wave of it Change" as the theme, focus on hot technology, focus on enterprise applications, leading it changes. From the Government, finance, education, medical, manufacturing and other industries, 1000 CIOs, as well as from Microsoft, Ufida, Lenovo, Hewlett-Packard, Dell, Informatica and other business solutions provider of experts, gathered at the National Convention Center, We discuss the new opportunities and challenges brought by new technology wave to enterprise informatization construction. Microsoft Greater China Vice President and marketing strategy ...