SQL语句,当id=1时,将name和age分别修改为 Mike和15
时间: 2024-03-06 07:49:57 浏览: 26
好的,以下是针对您的问题所写的 SQL 语句:
```
UPDATE 表名 SET name='Mike', age=15 WHERE id=1;
```
其中,`表名`是您要修改的表的名称,`id`是该表中表示每个数据行的唯一标识符的列名,`name`和`age`是您要修改的列名,`Mike`和`15`是您要修改成的值。请注意,这个 SQL 语句只会修改符合条件的数据行,即 `id` 等于 1 的数据行,其他行不会被修改。
相关问题
SQL Server语句
好的,以下是根据您的要求编写的SQL Server语句,包括创建数据库、表、视图、索引、约束、存储过程和触发器,以及各种查询语句:
1. 创建数据库:
```
CREATE DATABASE MyDatabase;
```
2. 创建表:
```
CREATE TABLE Students (
ID INT PRIMARY KEY,
Name VARCHAR(50),
Age INT,
Gender VARCHAR(10),
Major VARCHAR(50)
);
CREATE TABLE Courses (
ID INT PRIMARY KEY,
Name VARCHAR(50),
Teacher VARCHAR(50)
);
CREATE TABLE Scores (
ID INT PRIMARY KEY,
StudentID INT,
CourseID INT,
Score FLOAT,
CONSTRAINT FK_Student FOREIGN KEY (StudentID) REFERENCES Students(ID),
CONSTRAINT FK_Course FOREIGN KEY (CourseID) REFERENCES Courses(ID)
);
CREATE TABLE Departments (
ID INT PRIMARY KEY,
Name VARCHAR(50),
ManagerID INT,
CONSTRAINT FK_Manager FOREIGN KEY (ManagerID) REFERENCES Employees(ID)
);
CREATE TABLE Employees (
ID INT PRIMARY KEY,
Name VARCHAR(50),
Age INT,
Gender VARCHAR(10),
DepartmentID INT,
CONSTRAINT FK_Department FOREIGN KEY (DepartmentID) REFERENCES Departments(ID)
);
```
3. 插入数据:
```
INSERT INTO Students (ID, Name, Age, Gender, Major)
VALUES (1, 'Tom', 20, 'Male', 'Computer Science'),
(2, 'Jane', 21, 'Female', 'English'),
(3, 'Mike', 19, 'Male', 'Mathematics'),
(4, 'Lily', 22, 'Female', 'History'),
(5, 'John', 20, 'Male', 'Physics');
INSERT INTO Courses (ID, Name, Teacher)
VALUES (1, 'Database', 'Mr. Smith'),
(2, 'English Composition', 'Ms. Lee'),
(3, 'Calculus', 'Dr. Johnson'),
(4, 'World History', 'Prof. Brown'),
(5, 'Quantum Mechanics', 'Dr. Kim');
INSERT INTO Scores (ID, StudentID, CourseID, Score)
VALUES (1, 1, 1, 95),
(2, 2, 2, 88),
(3, 3, 3, 92),
(4, 4, 4, 85),
(5, 5, 5, 90);
INSERT INTO Departments (ID, Name, ManagerID)
VALUES (1, 'Computer Science', 1),
(2, 'English', 2),
(3, 'Mathematics', 3),
(4, 'History', 4),
(5, 'Physics', 5);
INSERT INTO Employees (ID, Name, Age, Gender, DepartmentID)
VALUES (1, 'Mr. Smith', 40, 'Male', 1),
(2, 'Ms. Lee', 35, 'Female', 2),
(3, 'Dr. Johnson', 45, 'Male', 3),
(4, 'Prof. Brown', 50, 'Male', 4),
(5, 'Dr. Kim', 38, 'Female', 5);
```
4. 模式匹配查询:
```
SELECT * FROM Students WHERE Name LIKE '%Tom%';
```
5. TOP查询:
```
SELECT TOP 3 * FROM Courses ORDER BY Name DESC;
```
6. IN查询:
```
SELECT * FROM Students WHERE Major IN ('Computer Science', 'Mathematics');
```
7. 降序查询:
```
SELECT * FROM Scores ORDER BY Score DESC;
```
8. COUNT集合函数查询:
```
SELECT COUNT(*) FROM Students;
```
9. 分组统计查询:
```
SELECT Major, AVG(Age) AS AvgAge, COUNT(*) AS Total FROM Students GROUP BY Major;
```
10. 连接条件的多表查询:
```
SELECT Students.Name, Courses.Name AS CourseName, Scores.Score
FROM Students
INNER JOIN Scores ON Students.ID = Scores.StudentID
INNER JOIN Courses ON Scores.CourseID = Courses.ID;
```
11. 比较运算符的子查询:
```
SELECT * FROM Students WHERE Age > (SELECT AVG(Age) FROM Students);
```
12. IN的子查询:
```
SELECT * FROM Courses WHERE ID IN (SELECT CourseID FROM Scores WHERE Score > 90);
```
13. 创建视图:
```
CREATE VIEW StudentInfo AS
SELECT Students.Name, Courses.Name AS CourseName, Scores.Score
FROM Students
INNER JOIN Scores ON Students.ID = Scores.StudentID
INNER JOIN Courses ON Scores.CourseID = Courses.ID;
```
14. 创建索引:
```
CREATE INDEX idx_StudentName ON Students (Name);
```
15. 创建唯一性约束、检查约束、默认值约束、外键约束:
```
ALTER TABLE Employees ADD CONSTRAINT UC_EmployeeName UNIQUE (Name);
ALTER TABLE Departments ADD CONSTRAINT CK_DepartmentName CHECK (LEN(Name) > 0);
ALTER TABLE Courses ALTER COLUMN Teacher SET DEFAULT 'Unknown';
ALTER TABLE Scores ADD CONSTRAINT FK_Student FOREIGN KEY (StudentID) REFERENCES Students(ID) ON DELETE CASCADE;
```
16. 创建存储过程:
```
CREATE PROCEDURE sp_GetStudentInfo @StudentName VARCHAR(50)
AS
BEGIN
SELECT Students.Name, Courses.Name AS CourseName, Scores.Score
FROM Students
INNER JOIN Scores ON Students.ID = Scores.StudentID
INNER JOIN Courses ON Scores.CourseID = Courses.ID
WHERE Students.Name = @StudentName;
END;
```
17. 创建插入、更新的DML触发器:
```
CREATE TRIGGER tr_StudentInsert ON Students
AFTER INSERT
AS
BEGIN
INSERT INTO AuditTrail (TableName, Action, UserName, DateTime)
VALUES ('Students', 'Insert', SUSER_SNAME(), GETDATE());
END;
CREATE TRIGGER tr_StudentUpdate ON Students
AFTER UPDATE
AS
BEGIN
INSERT INTO AuditTrail (TableName, Action, UserName, DateTime)
VALUES ('Students', 'Update', SUSER_SNAME(), GETDATE());
END;
```
帮我用Mysql生成user的表的20条测试数据,user表共有六个字段分别为id、name、age、phone、address、or
der,可以使用以下SQL语句生成:
INSERT INTO `user` (`id`, `name`, `age`, `phone`, `address`, `order`) VALUES
(1, 'John', 25, '12345678901', 'Beijing', 1),
(2, 'Alice', 30, '13987654321', 'Shanghai',2),
(3, 'Mike', 23, '15876543210', 'Guangzhou', 3),
(4, 'Sarah', 27, '13798765432', 'Chengdu', 4),
(5, 'Tom', 29, '15009876543', 'Hangzhou', 5),
(6, 'Kate', 26, '13345678901', 'Nanjing', 6),
(7, 'Bob', 28, '18909876543', 'Shenzhen', 7),
(8, 'Lucy', 32, '13876543210', 'Xi\'an', 8),
(9, 'David', 24, '15109876543', 'Wuhan', 9),
(10, 'Julia', 31, '13698765432', 'Chongqing', 10),
(11, 'Jack', 22, '13309876543', 'Tianjin', 11),
(12, 'Lily', 33, '18676543210', 'Changsha', 12),
(13, 'Alex', 29, '13809876543', 'Nanning', 13),
(14, 'Eva', 27, '13598765432', 'Harbin', 14),
(15, 'Nick', 28, '13709876543', 'Urumqi', 15),
(16, 'Grace', 25, '15276543210', 'Lanzhou', 16),
(17, 'Jason', 24, '13609876543', 'Kunming', 17),
(18, 'Kelly', 30, '13498765432', 'Xiamen', 18),
(19, 'Will', 32, '15309876543', 'Zhengzhou', 19),
(20, 'Oliver', 31, '13909876543', 'Nanchang', 20);
这段SQL语句将会生成20条user表的示例数据,你可以将其复制粘贴到你的MySQL客户端中执行。
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