full-text-search

问题 This psql session snippet should be self-explanatory: psql (9.1.7) Type "help" for help. => CREATE TABLE languages(language VARCHAR NOT NULL); CREATE TABLE => INSERT INTO languages VALUES ('english'),('french'),('turkish'); INSERT 0 3 => SELECT language, to_tsvector('english', 'hello world') FROM languages; language| to_tsvector ---------+--------------------- english | 'hello':1 'world':2 french | 'hello':1 'world':2 turkish | 'hello':1 'world':2 (3 rows) => SELECT language, to_tsvector

问题 Does Android come with a way to do Full Text Search? I know is it not even possible to search contacts by the notes field, being Google the search company, but I would be disappointed if there is no API for that. 回答1: The easiest way to provide Full Text Search is to use FTS3 in SQLite 回答2: Lucene is another approach, that is faster than SQLite FTS 来源： https://stackoverflow.com/questions/1976320/android-full-text-search

问题 I have basic stored procedure that performs a full text search against 3 columns in a table by passing in a @Keyword parameter. It works fine with one word but falls over when I try pass in more than one word. I'm not sure why. The error says: Syntax error near 'search item' in the full-text search condition 'this is a search item' SELECT S.[SeriesID], S.[Name] as 'SeriesName', P.[PackageID], P.[Name] FROM [Series] S INNER JOIN [PackageSeries] PS ON S.[SeriesID] = PS.[PackageID] INNER JOIN

问题 I need to find occurrences of ~ 25 000 words within a text. What is the most suitable algorithm/library for this purpose? target language is C++ 回答1: build a hashtable with the words, and scan throuhgt the text, for each word lookup in the wordtable and stuff the needed info (increment count, add to a position list, whatever). 回答2: I once used the Boyer-Moore algorithm and it was quite fast. Boyer-Moore isn't apt for efficiently searching many words. There is actually a very efficient

问题 SQL DB2/400 : Is there somebody has tried to work wth FullText. If i can have a sql exemple code, it will be great . I would like, for exemple, to use it with a clob column. Many thanks 回答1: This pulls out all of space delimited words from mylib.myfile[mytext] and puts them into a table with two columns. I limit the word length to 15 cause really when do users type in words longer than 15 chars anyways and I've probably already found a match on the 1st 15 and presented a list to the user. I

问题 Here's my quandary. I have a variable that contains a paragraph of text, and I have a column full of keywords. I want to search each of the keywords contained in the column against the entirety of the text contained within my variable. The only way that I know how to do this is to select each row of the column one at a time, and then use the LIKE operator with wildcards on each side to see if the keyword from the column is found anywhere in the text within the variable. Every way that I try

问题 Here's my quandary. I have a variable that contains a paragraph of text, and I have a column full of keywords. I want to search each of the keywords contained in the column against the entirety of the text contained within my variable. The only way that I know how to do this is to select each row of the column one at a time, and then use the LIKE operator with wildcards on each side to see if the keyword from the column is found anywhere in the text within the variable. Every way that I try

问题 I like to sort a BOOLEAN wildcard search by relevance. As BOOLEAN has only a binary score we need to use the NATURAL mode to obtain a weight score. But NATURAL does not support operators so it will not return any results (score = 0): mysql>SELECT topic_id, MATCH(topic_text) AGAINST('tunin') AS score FROM topics_search WHERE MATCH(topic_text) AGAINST('tunin*' IN BOOLEAN MODE) ORDER BY score DESC LIMIT 10 +----------+----------+ | topic_id | score | +----------+----------+ | 2 | 0 | | 6 | 0 | |

问题 Edit : SQL doesn't work for this. I just found out about Solr/Sphinx and it seems like the right tool for this problem, so if you know Solr or Sphinx I'm eager to hear from you. Basically, I have a .tsv with patent info and a .csv with product names. I need to match each row of the patents column against the product names and extract the occurrences in a new .csv column. You can scroll down and see the example at the end. Original question: SQL newbie here so bear with me :). I can't figure

问题 My question is a little simillar to Extract specific words from text field in mysql, but now the same. I have a text field with words inside. In my language word can have many different endings. I need to find this endings. I use fulltext search of mysql, but I would need to have access to the index database where all the field is "cut" to words and words are counted. I could then search for "test*" and I could quickly find "test", "tested", "testing". I need the list of all endigns that