sqlite3 create index 文心快码BaiduComate SQLite3 中的索引(Index) 在SQLite3 中,索引是一种用于提高数据库查询速度的数据结构。它类似于书的目录,可以加快数据的检索速度。索引通过存储表中一列或多列的值及其对应的行号,使得数据库能够快速定位到特定的数据行。 创建SQLite3 索引的基本语法 创建索引的基本语法...
SQLite的SQL语法 [目录] CREATE INDEX sql-statement ::=CREATE [UNIQUE] INDEX [IF NOT EXISTS] [database-name .] index-name ON table-name ( column-name [, column-name]* )column-name ::=name [ COLLATE collation-name] [ ASC | DESC CREATE INDEX命令由"CREATE INDEX"关键字后跟新索引的名字,...
The SQLite Create Index Tool allows users to visually create indexes. The Create Index Tool allows users to select a table on which to create an index and then specify the uniqueness of the index as well as the columns that make up the index. The following is an example of the SQL gener...
index com_id_name company 4 CREATE INDEX com_id_name ON company (com_id,c index unique_com_id company 5 CREATE UNIQUE INDEX unique_com_id ON company( Collation The COLLATE keyword is used to make a column case-insensitive associated with index. This means that values in the indexed colum...
Schema create [unique] index [if not exists] {name} on {table name} ( {column} ) [where {expr}] -- {column} : -- {name} [COLLATE {name}] [ASC,DESC] Example CREATE INDEX uid_index ON MyTable (uid) History About Settings SQLite storage → "Create SQLite DB" I recommend...
Create Index in MySQL, PostgreSQL, Oracle, SQL Server Create Index in MySQL [5.7] Without an index, MySQL must begin with the first row and then read through the entire table to find the relevant rows. The larger the table, the more this costs. If the table has an index for the colum...
如何获知Sqlite支持版本 通过RdbStore.query()获取resultSet对象,出现resultSet的rowCount返回结果为-1 如何读取本地/预制数据库 如何将数据库数据内置到app 用sqlite开发时,怎么保证数据库同一时间只能支持一个写操作?怎么创建索引? 数据库查询失败 14800007 RdbStore多线程安全注意事项 KVStore的get批量获取[...
SQL As Understood By SQLite[Contents] CREATE INDEXsql-statement::=CREATE [UNIQUE] INDEX [database-name .] index-name ON table-name ( column-name [, co
说明:此内容衔接上一次的内容,所有的语句是属于sqlite,并且都经过调试,结果都是正确的; 十八、数据的插入 创建一个actor_name表,将actor表中的所有first_name以及last_name导入改表。 actor_name表结构如下: 实现语句: create table if not exists actor_name( ...
A set of SQLconstraintsfor each table. SQLite supports UNIQUE, NOT NULL, CHECK and FOREIGN KEY constraints. A unique indexes will automatically create to enforce a UNIQUE or PRIMARY KEY constraint. and they cannot be manually dropped with the DROP INDEX command. ...