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The fuzzy search keyword in mysql can be used with the LIKE keyword, which can query for fields with key words, but when the data is large (such as millions), a full table scan can cause poor performance due to the inability to use the index. How can you query the contents of the inclusion keyword? In this case, you can use MySQL Full-text search. But there is a prerequisite: you need to add a fulltext inde

Second, the grammarMATCH (Col1,col2,...) Against (expr [search_modifier])Search_modifier: {in BOOLEAN MODE | With QUERY expansion}For example: SELECT * from Tab_name WHERE MATCH (col1,col2) against (Search_word);The table here needs to be MyISAM type tables, col1, col2 need to be char, varchar, or text type, and a Full-text index must be established on col1 and col2 before querying.1. Prerequisites for using MySQL

Tags: table one select Alter Plain full table scan first full-text search memberThe Ysql index is used to quickly look for records with specific values, and all MySQL indexes are saved as B-trees. If there is no index, MySQL must start scanning all records of the entire table from the first record until it finds a record that meets the requirements. The higher the number of records in the table, the higher

Tags: des class tar ext int httpReprint Address: http://www.2cto.com/database/201212/173873.htmlFirst, understand full-text search www.2cto.com 1, MyISAM support full-text search, and InnoDB not supported. 2, when using full-text search, MySQL does not need to view each row separately, and does not need to parse and process each word separately. MySQL creates an

In the process of natural language processing, the inconsistency of the full-width and half-angle causes the information extraction to be inconsistent and therefore needs to be unified.Conversion instructionsFull-width Half-width conversion descriptionRegular (with no spaces): Full-width character Unicode encoding from 65281~65374 (hex 0xff01 ~ 0xff5e)Half-width character Unicode encoding from 33~1

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MySQL full-text search, sql writing: MATCH (Col1,col2,...) Against (expr [in BOOLEAN MODE | With QUERY expansion]) Like what: SELECT * from articles WHERE MATCH (title,body) against (' database '); The MATCH () function performs a natural language search within a database for a string. A database is 1 sets of 1 or 2 columns contained within Fulltext. The search string is given as a parameter to the against (). For each row in the table, MATCH () retur

Outer Joins. An outer join can be a left outer join, a right outer join, or a full outer join. When you specify an outer join in the FROM clause, you can specify one of the following groups of keywords: Left JOIN or left OUTER join. The result set of a left outer join consists of all the rows of the left table specified in the OUTER clause, not just the rows that the join columns match. If a row in the left table does not have a matching row in the r

In the daily operations, the backup of MySQL database is extremely important, in case the database table is lost or corrupted, can recover the data in time.On-line Database backup scenario:Perform a full backup every Sunday, and then perform a mysqldump incremental backup every 1 o'clock in the afternoon.Below is a detailed description of this backup scenario:1.MySQLdump Incremental Backup ConfigurationThe prerequisite for performing an incremental ba

Outer Joins. An outer join can be a left outer join, a right outer join, or a full outer join. When you specify an outer join in the FROM clause, you can specify one of the following groups of keywords: Left JOIN or left OUTER join. The result set of the left outer join consists of all the rows of the left table specified in the OUTER clause, not just Is the row that the join column matches. If a row in the left table does not have a matching row in

Lucene is a subproject of the Apache Software Foundation 4 Jakarta Project group, an open source full-Text Search engine toolkit, which is not a full-text search engine, but a full-text search engine architecture that provides a complete query engine and index engine. Part of the text analysis engine (English and German two Western languages). Lucene's goal is to

Tags: where set file size table Create test data entity base shrinkMost recently, I encountered a disk full when I was doing alwayson, this is because the database participating in AlwaysOn must be the full recovery model, and the full recovery model, the database shrinkage is not effective, so you can only use transaction log backups to do transaction log trunca

Full and differential backup of SQL ServerA full backup is, of course, a backup of all the database dataA differential backup, however, refers to a backup of the changes to the data after the last backup.Therefore, differential backups cannot be used alone, and you can restore a differential backup only after the last full backup was first restored.When you have

Tags: Full recovery incomplete recovery user management backup recovery based on time SCN and cancer recoveryCompare full and incomplete restores:A. Full recovery: Restores the database to its current state, including all committed data changes until the request is resumedSecond, incomplete recovery: Restore the database to the last point of time specified before

The Full-text indexing provides effective support for complex word searches in string data. Full-text indexing stores information about important words and where they are located in a particular column. This information is used by Full-text queries to quickly search for lines that contain specific words or groups of words. The

MySQL provides a solution for this problem based on the built-in Full-text lookup. Here, developers simply mark out fields that require Full-text lookup, and then run the search in those fields using a special MySQL method, which not only improves performance and efficiency (because MySQL indexes these fields to optimize the search), but also enables higher quality searches, Because MySQL uses natural langu

Strategy FLASH Full screen has two categories of four: 　　 1, do not use the browser directly with the Flash Player type: 　　 A, do not display the Flash Player menu bar full screen (similar to screen saver effect), the actions in the first frame with the FS command commands, in the For standalone player option, select Fullscreen to True. Run to press ESC to exit or set a button to use the FS command on the a

Label:Transferred from: http://quentinxxz.iteye.com/blog/2149440 One, under normal circumstances, should not have this demand First of all, we should have a concept, the title of this problem, in most cases is a pseudo-proposition, should not be mentioned. To know, for the general large data volume of the database, full table query, this operation generally should not appear, in the normal query, if the scope of the query, you should at least add limi