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      SQLite 语法

      SQLite 语法

      SQLite 是遵循一套独特的称为语法的规则和准则。本教程列出了所有基本的 SQLite 语法,向您提供了一个 SQLite 快速入门。

      大小写敏感性

      有个重要的点值得注意,SQLite 是不区分大小写的,但也有一些命令是大小写敏感的,比如 GLOBglob 在 SQLite 的语句中有不同的含义。

      注释

      SQLite 注释是附加的注释,可以在 SQLite 代码中添加注释以增加其可读性,他们可以出现在任何空白处,包括在表达式内和其他 SQL 语句的中间,但它们不能嵌套。

      SQL 注释以两个连续的 “-” 字符(ASCII 0x2d)开始,并扩展至下一个换行符(ASCII 0x0a)或直到输入结束,以先到者为准。

      您也可以使用 C 风格的注释,以 “/*” 开始,并扩展至下一个 “*/” 字符对或直到输入结束,以先到者为准。SQLite的注释可以跨越多行。

      sqlite>.help -- 这是一个简单的注释
      
      

      SQLite 语句

      所有的 SQLite 语句可以以任何关键字开始,如 SELECT、INSERT、UPDATE、DELETE、ALTER、DROP 等,所有的语句以分号(;)结束。

      SQLite ANALYZE 语句:

      ANALYZE;
      or
      ANALYZE database_name;
      or
      ANALYZE database_name.table_name;
      
      

      SQLite AND/OR 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  CONDITION-1 {AND|OR} CONDITION-2;
      
      

      SQLite ALTER TABLE 语句:

      ALTER TABLE table_name ADD COLUMN column_def...;
      
      

      SQLite ALTER TABLE 语句(Rename):

      ALTER TABLE table_name RENAME TO new_table_name;
      
      

      SQLite ATTACH DATABASE 语句:

      ATTACH DATABASE 'DatabaseName' As 'Alias-Name';
      
      

      SQLite BEGIN TRANSACTION 语句:

      BEGIN;
      or
      BEGIN EXCLUSIVE TRANSACTION;
      
      

      SQLite BETWEEN 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  column_name BETWEEN val-1 AND val-2;
      
      

      SQLite COMMIT 语句:

      COMMIT;
      
      

      SQLite CREATE INDEX 语句:

      CREATE INDEX index_name
      ON table_name ( column_name COLLATE NOCASE );
      
      

      SQLite CREATE UNIQUE INDEX 语句:

      CREATE UNIQUE INDEX index_name
      ON table_name ( column1, column2,...columnN);
      
      

      SQLite CREATE TABLE 语句:

      CREATE TABLE table_name(
         column1 datatype,
         column2 datatype,
         column3 datatype,
         .....
         columnN datatype,
         PRIMARY KEY( one or more columns )
      );
      
      

      SQLite CREATE TRIGGER 语句:

      CREATE TRIGGER database_name.trigger_name 
      BEFORE INSERT ON table_name FOR EACH ROW
      BEGIN 
         stmt1; 
         stmt2;
         ....
      END;
      
      

      SQLite CREATE VIEW 语句:

      CREATE VIEW database_name.view_name  AS
      SELECT statement....;
      
      

      SQLite CREATE VIRTUAL TABLE 语句:

      CREATE VIRTUAL TABLE database_name.table_name USING weblog( access.log );
      or
      CREATE VIRTUAL TABLE database_name.table_name USING fts3( );
      
      

      SQLite COMMIT TRANSACTION 语句:

      COMMIT;
      
      

      SQLite COUNT 子句:

      SELECT COUNT(column_name)
      FROM   table_name
      WHERE  CONDITION;
      
      

      SQLite DELETE 语句:

      DELETE FROM table_name
      WHERE  {CONDITION};
      
      

      SQLite DETACH DATABASE 语句:

      DETACH DATABASE 'Alias-Name';
      
      

      SQLite DISTINCT 子句:

      SELECT DISTINCT column1, column2....columnN
      FROM   table_name;
      
      

      SQLite DROP INDEX 语句:

      DROP INDEX database_name.index_name;
      
      

      SQLite DROP TABLE 语句:

      DROP TABLE database_name.table_name;
      
      

      SQLite DROP VIEW 语句:

      DROP VIEW view_name;
      
      

      SQLite DROP TRIGGER 语句:

      DROP TRIGGER trigger_name
      
      

      SQLite EXISTS 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  column_name EXISTS (SELECT * FROM   table_name );
      
      

      SQLite EXPLAIN 语句:

      EXPLAIN INSERT statement...;
      or 
      EXPLAIN QUERY PLAN SELECT statement...;
      
      

      SQLite GLOB 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  column_name GLOB { PATTERN };
      
      

      SQLite GROUP BY 子句:

      SELECT SUM(column_name)
      FROM   table_name
      WHERE  CONDITION
      GROUP BY column_name;
      
      

      SQLite HAVING 子句:

      SELECT SUM(column_name)
      FROM   table_name
      WHERE  CONDITION
      GROUP BY column_name
      HAVING (arithematic function condition);
      
      

      SQLite INSERT INTO 语句:

      INSERT INTO table_name( column1, column2....columnN)
      VALUES ( value1, value2....valueN);
      
      

      SQLite IN 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  column_name IN (val-1, val-2,...val-N);
      
      

      SQLite Like 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  column_name LIKE { PATTERN };
      
      

      SQLite NOT IN 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  column_name NOT IN (val-1, val-2,...val-N);
      
      

      SQLite ORDER BY 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  CONDITION
      ORDER BY column_name {ASC|DESC};
      
      

      SQLite PRAGMA 语句:

      PRAGMA pragma_name;
      
      For example:
      
      PRAGMA page_size;
      PRAGMA cache_size = 1024;
      PRAGMA table_info(table_name);
      
      

      SQLite RELEASE SAVEPOINT 语句:

      RELEASE savepoint_name;
      
      

      SQLite REINDEX 语句:

      REINDEX collation_name;
      REINDEX database_name.index_name;
      REINDEX database_name.table_name;
      
      

      SQLite ROLLBACK 语句:

      ROLLBACK;
      or
      ROLLBACK TO SAVEPOINT savepoint_name;
      
      

      SQLite SAVEPOINT 语句:

      SAVEPOINT savepoint_name;
      
      

      SQLite SELECT 语句:

      SELECT column1, column2....columnN
      FROM   table_name;
      
      

      SQLite UPDATE 语句:

      UPDATE table_name
      SET column1 = value1, column2 = value2....columnN=valueN
      [ WHERE  CONDITION ];
      
      

      SQLite VACUUM 语句:

      VACUUM;
      
      

      SQLite WHERE 子句:

      SELECT column1, column2....columnN
      FROM   table_name
      WHERE  CONDITION;
      
      
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