| 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
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_nameor 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 |
