solr distinct

When developing Web applications, you often have to add search capabilities. I didn't even know what to search, so I drew a magnifying glass on the sketch. Search is a very important feature, so lucene based tools like Elasticsearch and SOLR become

This article was reproduced from: http://coolshell.cn/articles/7270.html ================================================ Full-text translation from the wall of the article "NoSQL Data Modeling techniques", translation is not good, please forgive me.

First, MySQL The main application scenarios1. Web Site System2. Logging System3. Data Warehouse System4. Embedded systemSecond, MySQL Frame Composition:Third, MySQL Storage Engine Overview1 ) MyISAM Storage EngineMyISAM Storage Engine table in the

First, MySQL The main application scenarios1. Web Site System2. Logging System3. Data Warehouse System4. Embedded systemSecond, MySQL Frame Composition:Third, MySQL Storage Engine Overview1 ) MyISAM Storage EngineMyISAM Storage Engine table in the

First, MySQL The main application scenarios1. Web Site System2. Logging System3. Data Warehouse System4. Embedded systemSecond, MySQL Frame Composition:Third, MySQL Storage Engine Overview1 ) MyISAM Storage EngineMyISAM Storage Engine table in the

First, MySQL The main application scenarios1. Web Site System2. Logging System3. Data Warehouse System4. Embedded systemSecond, MySQL Frame Composition:Third, MySQL Storage Engine Overview1 ) MyISAM Storage EngineMyISAM Storage Engine table in the

First, the main application of MySQL scenario1. Web Site System2. Logging System3. Data Warehouse System4. Embedded systemSecond, MySQL frame compositionIii. Overview of the MySQL storage engine1) MyISAM Storage EngineMyISAM Storage Engine table in

First, MySQL The main application scenarios1. Web Site System2. Logging System3. Data Warehouse System4. Embedded systemSecond, MySQL Frame Composition:Third, MySQL Storage Engine Overview1 ) MyISAM Storage EngineMyISAM Storage Engine table in the

CentOS MySQL Optimization 13th sessionMySQL IndexPrimary key value cannot be duplicated, nor can it be nullUnique key + NOT NULL business PRIMARY key with unique index instead ofCase: A InnoDB table, there is no self-increment column primary key,

Grouping introductionWhen we do lucene search, we may use the statistics of a certain condition, such as statistics of how many provinces, in SQL query we can use distinct to complete similar functions, you can also use GROUP by to query column