SQL 常用语句
SQL 常用语句参考手册，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 (备注: 删除整个表！) 或者 DELETE FROM table_name |
| DROP DATABASE | DROP DATABASE database_name |
| DROP INDEX | DROP INDEX table_name.index_name |
| DROP TABLE (删除整个表的数据及结构) | 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,….) 或者 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 (通常用于创建表的备份副本) | SELECT * INTO new_table_name FROM original_table_name 或者 SELECT column_name(s) |
| TRUNCATE TABLE (仅删除表中的数据) | 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 |