书籍是全世界的营养品。生活里没有书籍，就好像没有阳光；智慧里没有书籍，就好像鸟儿没有翅膀。
来自 W3School 的 SQL 快速参考。可以打印它，以备日常使用。
SQL 语句
| 语句 | 语法 |
|---|---|
| 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 |
| 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 |
| 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) |
|
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 |
