# SQL 快速參考
**來自 W3School 的 SQL 快速參考。可以打印它,以備日常使用。**
## SQL 語句
| 語句 | 語法 |
| --- | --- |
| AND / OR | SELECT column_name(s) FROM table_name WHERE condition AND|OR condition |
| ALTER TABLE (add column) | ALTER TABLE table_name ADD column_name datatype |
| ALTER TABLE (drop column) | ALTER TABLE table_name DROP COLUMN column_name |
| AS (alias for column) | SELECT column_name AS column_alias FROM table_name |
| AS (alias for table) | SELECT column_name FROM table_name? AS table_alias |
| BETWEEN | SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2 |
| CREATE DATABASE | CREATE DATABASE database_name |
| CREATE INDEX | CREATE INDEX index_name ON table_name (column_name) |
| CREATE TABLE | CREATE TABLE table_name ( column_name1 data_type, column_name2 data_type, ....... ) |
| CREATE UNIQUE INDEX | CREATE UNIQUE INDEX index_name ON table_name (column_name) |
| CREATE VIEW | CREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition |
| DELETE FROM | DELETE FROM table_name (**Note:** Deletes the entire table!!) _or_ DELETE FROM table_name WHERE condition |
| DROP DATABASE | DROP DATABASE database_name |
| DROP INDEX | DROP INDEX table_name.index_name |
| DROP TABLE | DROP TABLE table_name |
| GROUP BY | SELECT column_name1,SUM(column_name2) FROM table_name GROUP BY column_name1 |
| HAVING | SELECT column_name1,SUM(column_name2) FROM table_name GROUP BY column_name1 HAVING SUM(column_name2) condition value |
| IN | SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,..) |
| INSERT INTO | INSERT INTO table_name VALUES (value1, value2,....) _or_ INSERT INTO table_name (column_name1, column_name2,...) VALUES (value1, value2,....) |
| LIKE | SELECT column_name(s) FROM table_name WHERE column_name LIKE pattern |
| ORDER BY | SELECT column_name(s) FROM table_name ORDER BY column_name [ASC|DESC] |
| SELECT | SELECT column_name(s) FROM table_name |
| SELECT \* | SELECT \* FROM table_name |
| SELECT DISTINCT | SELECT DISTINCT column_name(s) FROM table_name |
| SELECT INTO (used to create backup copies of tables) | SELECT * INTO new_table_name FROM original_table_name _or_ SELECT column_name(s) INTO new_table_name FROM original_table_name |
| TRUNCATE TABLE (deletes only the data inside the table) | TRUNCATE TABLE table_name |
| UPDATE | UPDATE table_name SET column_name=new_value [, column_name=new_value] WHERE column_name=some_value |
| WHERE | SELECT column_name(s) FROM table_name WHERE condition |
- SQL基礎
- SQL 簡介
- SQL 語法
- SQL SELECT 語句
- SQL SELECT DISTINCT 語句
- SQL WHERE 子句
- SQL AND & OR 運算符
- SQL ORDER BY 子句
- SQL INSERT INTO 語句
- SQL UPDATE 語句
- SQL DELETE 語句
- SQL高級
- SQL TOP 子句
- SQL LIKE 操作符
- SQL 通配符
- SQL IN 操作符
- SQL BETWEEN 操作符
- SQL Alias(別名)
- SQL JOIN
- SQL INNER JOIN 關鍵字
- SQL LEFT JOIN 關鍵字
- SQL RIGHT JOIN 關鍵字
- SQL FULL JOIN 關鍵字
- SQL UNION 和 UNION ALL 操作符
- SQL SELECT INTO 語句
- SQL CREATE DATABASE 語句
- SQL CREATE TABLE 語句
- SQL 約束 (Constraints)
- SQL NOT NULL 約束
- SQL UNIQUE 約束
- SQL PRIMARY KEY 約束
- SQL FOREIGN KEY 約束
- SQL CHECK 約束
- SQL DEFAULT 約束
- SQL CREATE INDEX 語句
- SQL 撤銷索引、表以及數據庫
- SQL ALTER TABLE 語句
- SQL AUTO INCREMENT 字段
- SQL VIEW(視圖)
- SQL函數
- SQL Date 函數
- SQL NULL 值
- SQL NULL 函數
- SQL 數據類型
- SQL 服務器 - RDBMS
- SQL 函數
- SQL AVG 函數
- SQL COUNT() 函數
- SQL FIRST() 函數
- SQL LAST() 函數
- SQL MAX() 函數
- SQL MIN() 函數
- SQL SUM() 函數
- SQL GROUP BY 語句
- SQL HAVING 子句
- SQL UCASE() 函數
- SQL LCASE() 函數
- SQL MID() 函數
- SQL LEN() 函數
- SQL ROUND() 函數
- SQL NOW() 函數
- SQL FORMAT() 函數
- SQL 快速參考
- SQLite 基礎
- SQLite 簡介
- SQLite 安裝
- SQLite 命令
- SQLite 語法
- SQLite 數據類型
- SQLite 創建數據庫
- SQLite 附加數據庫
- SQLite 分離數據庫
- SQLite 創建表
- SQLite 刪除表
- SQLite Insert 語句
- SQLite Select 語句
- SQLite 運算符
- SQLite 表達式
- SQLite Where 子句
- SQLite AND/OR 運算符
- SQLite Update 語句
- SQLite Delete 語句
- SQLite Like 子句
- SQLite Glob 子句
- SQLite Limit 子句
- SQLite Order By
- SQLite Group By
- SQLite Having 子句
- SQLite Distinct 關鍵字
- SQLite 高級
- SQLite PRAGMA
- SQLite 約束
- SQLite Joins
- SQLite Unions 子句
- SQLite NULL 值
- SQLite 別名
- SQLite 觸發器(Trigger)
- SQLite 索引(Index)
- SQLite Indexed By
- SQLite Alter 命令
- SQLite Truncate Table
- SQLite 視圖(View)
- SQLite 事務(Transaction)
- SQLite 子查詢
- SQLite Autoincrement(自動遞增)
- SQLite 注入
- SQLite Explain(解釋)
- SQLite Vacuum
- SQLite 日期 & 時間
- SQLite 常用函數
- SQLite 接口
- SQLite - C/C++
- SQLite - Java
- SQLite - PHP
- SQLite - Perl
- SQLite - Python
- MySQL 教程
- MySQL 教程
- MySQL 安裝
- MySQL 管理
- MySQL PHP 語法
- MySQL 連接
- MySQL 創建數據庫
- MySQL 刪除數據庫
- MySQL 選擇數據庫
- MySQL 數據類型
- MySQL 創建數據表
- MySQL 刪除數據表
- MySQL 插入數據
- MySQL 查詢數據
- MySQL where 子句
- MySQL UPDATE 查詢
- MySQL DELETE 語句
- MySQL LIKE 子句
- MySQL 排序
- Mysql Join的使用
- MySQL NULL 值處理
- MySQL 正則表達式
- MySQL 事務
- MySQL ALTER命令
- MySQL 索引
- MySQL 臨時表
- MySQL 復制表
- MySQL 元數據
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- MySQL 及 SQL 注入
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