Like any other 282 SQL query that does not contain an ORDER BY clause, the example above returns 283 results in an arbitrary order. 276 SELECT * FROM email WHERE email MATCH 'fts5' 277 SELECT * FROM email WHERE email = 'fts5' 278 SELECT * FROM email('fts5') 279 280 281 By default, FTS5 full-text searches are case-independent. The following three queries are equivalent. 272 For example: 273 274 - Query for all rows that contain at least once instance of the term 275 - "fts5" (in any column). For the table-valued 271 function syntax, the term to search for is specified as the first table argument. The expression on the right 270 must be a text value specifying the term to search for. 265 266 267 If using the MATCH or = operators, the expression to the left of the MATCH 268 operator is usually the name of the FTS5 table (the exception is when 269 specifying a column-filter ).
258 259 Once populated, there are three ways to execute a full-text query against 260 the contents of an FTS5 table: 261 262 Using a MATCH operator in the WHERE clause of a SELECT statement, or 263 Using an equals ( "=") operator in the WHERE clause of a SELECT statement, or 264 using the table-valued function syntax.
These may be used to modify the way in which the FTS5 table extracts 255 terms from documents and queries, to create extra indexes on disk to speed up 256 prefix queries, or to create an FTS5 table that acts as an index on content 257 stored elsewhere. 250 251 Not shown in the example above is that there are also 252 various options that may be provided to FTS5 as 253 part of the CREATE VIRTUAL TABLE statement to configure various aspects of the 254 new table. Like any other table with no PRIMARY KEY declaration, an 249 FTS5 table has an implicit INTEGER PRIMARY KEY field named rowid.
#Sqlite count words update#
Once created, 247 an FTS5 table may be populated using INSERT, UPDATE or DELETE statements 248 like any other table. For example: 241 242 CREATE VIRTUAL TABLE email USING fts5(sender, title, body) 243 244 245 It is an error to add types, constraints or PRIMARY KEY declarations to 246 a CREATE VIRTUAL TABLE statement used to create an FTS5 table. 238 239 To use FTS5, the user creates an FTS5 virtual table with one or more 240 columns.
The search functionality provided to world wide web users by 235 Google is, among other things, a full-text search 236 engine, as it allows users to search for all documents on the web that contain, 237 for example, the term "fts5".
In their most elementary form, 232 full-text search engines allow the user to efficiently search a large 233 collection of documents for the subset that contain one or more instances of a 234 search term. Overview of FTS5 228 229 FTS5 is an SQLite virtual table module that provides 230 full-text search 231 functionality to database applications.
#Sqlite count words code#
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