一、插入数据
（1）INSERT INTO Persons VALUES (‘Gates‘, ‘Bill‘, ‘Xuanwumen 10‘, ‘Beijing‘)
（2）INSERT INTO Persons (LastName, Address)
VALUES (‘Wilson‘, ‘Champs-Elysees‘),(‘Wilson2‘, ‘Champs-Elysees2‘)
（3）INSERT INTO Persons select * from Persons2
（4）SELECT LastName,FirstName INTO Persons_backup FROM Persons
二、删除数据
（1）DELETE FROM Person WHERE LastName = ‘Wilson‘
（2）drop Person
三、修改数据
（1）UPDATE Person SET Address = ‘Zhongshan 23‘, City = ‘Nanjing‘
WHERE LastName = ‘Wilson‘
（2）update p set p.Address = ‘Zhongshan 23‘
from Person p inner join City c on p.cityId = c.id where c.name = ‘北京‘
四、查询语句
1、普通查询：
（1）SELECT LastName,FirstName FROM Persons WHERE City=‘Beijing‘
ORDER BY Company DESC, OrderNumber ASC
（2）SELECT DISTINCT Company FROM Orders
（3）SELECT * FROM Persons WHERE (FirstName=‘Thomas‘ OR FirstName=‘William‘)
AND LastName=‘Carter‘
（4）SELECT * FROM Persons WHERE LastName IN (‘Adams‘,‘Carter‘)
（5）SELECT * FROM Persons WHERE LastName NOT BETWEEN ‘Adams‘ AND ‘Carter‘
（6）SELECT TOP 2 * FROM Persons (只sqlserver)
（7）SELECT * FROM Persons LIMIT 5 (只mysql)
（8）SELECT po.OrderID, p.LastName, p.FirstName FROM Persons AS p,
Product_Orders AS po WHERE p.LastName=‘Adams‘ AND p.FirstName=‘John‘（别名）
（9）SELECT column_name(s) FROM table_name1 UNION ALL SELECT column_name(s) FROM table_name2（合并结果集，union all是直接连接，取到得是所有值，
记录可能有重复；union 是取唯一值，记录没有重复）
2、like查询
（1）SELECT * FROM Persons WHERE City LIKE ‘%‘ + ‘N‘ + ‘%‘
（2）SELECT * FROM Persons WHERE City LIKE ‘N%‘（这种方式可能用到索引）
（3）SELECT * FROM user where userName like ‘发_1_2‘（_仅替代一个字符）
（4）SELECT top 10 * FROM user where userId like ‘[23]%‘
（[charlist]字符列中的任何单一字符，只sqlserver有用）
（5）SELECT top 10 * FROM user where userId like ‘[^23]0%‘
（[^charlist]不在字符列中的任何单一字符，只sqlserver有用）
3、关联查询
SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons
INNER JOIN Orders ON Persons.Id_P = Orders.Id_P ORDER BY Persons.LastName
（1）JOIN: 如果表中有至少一个匹配，则返回行
（2）LEFT JOIN: 即使右表中没有匹配，也从左表返回所有的行
（3）RIGHT JOIN: 即使左表中没有匹配，也从右表返回所有的行
（4）FULL JOIN: 只要其中一个表中存在匹配，就返回行