sql语句系列(1)-insert、update、delete语句

创建简单的数据表:

CREATE TABLE Student(
 StudentNo INT PRIMARY KEY IDENTITY(0,1) NOT NULL,
 StudentName VARCHAR(20) NOT NULL,
 Age SMALLINT NOT NULL,
 Address VARCHAR(200)   NULL,
 Remark VARCHAR(200) NULL
); 

修改数据表:

//添加检查约束
ALTER TABLE Student
ADD CONSTRAINT CK_Student_Age CHECK(Age>=0 AND Age<=120)
//添加字段:
ALTER TABLE Student
ADD Salary MONEY NULL

Insert 插入语句:

INSERT INTO Customer(CustomerName,IdentityNo,Adddress,Email,Remark) 
VALUES('徐姑姑','320323198505648958','上海','[email protected]','well done!');


INSERT INTO Customer(CustomerName,IdentityNo,Adddress,Email,Remark) 
VALUES('朱闪闪','32032319880864836','苏州','[email protected]','Come On!'),
('张大炮','32032319890845636','杭州','[email protected]','逗比一个')

--将查询出来的结果集插入到数据表中
INSERT INTO Customer(CustomerName,IdentityNo,Adddress,Email,Remark) 
SELECT '王艳','3689566238466366','湖南','[email protected]','so nice a person'

Update语句:

UPDATE Customer SET CustomerName='王思聪',IdentityNo='356894198658564836',Adddress='北京',
Email='[email protected]',Remark='豪华富二代' WHERE CustomerNo=3

Delete语句:

DELETE FROM Customer WHERE CustomerNo=7