基本語句
1、mysql -u root -p 數據庫連接
2、create databases 數據庫名 創建數據庫
3、drop database 數據庫名 刪除數據庫
查詢語句
4、SELECT * FROM 表名稱 查詢表中所有數據
5、SELECT idcard,name
FROM student 條件查詢，
6、SELECT DISTINCT addr
FROM student 查詢到重複值只輸出一次
7、SELECT *
FROM student
WHERE idcard=1; 查詢idcard爲1的學生信息
8、SELECT *
FROM student
WHERE name="TOM" AND age=18; 查詢名字爲TOM並且年齡爲18
9、SELECT *
FROM student
WHERE name="T" OR age=18; 查詢名字爲T或者年齡爲18的滿足一個條件即可
10、SELECT idcard,name,age
FROM student
ORDER BY age; 按年齡升序查詢
11、INSERT INTO student VALUES (7,"MARRY",22,1,"浙江紹興"); 像表格中插入數據
12、UPDATE student SET gender = 0; 更新表中某列的數據
13、UPDATE student SET gender = 0
WHERE idcard=1; 更新表中某行某列的數據
14、DELETE
FROM student
WHERE idcard = 5; 刪除idcard爲5的行
15、SELECT *
FROM student
WHERE addr LIKE "%湖%"; 查詢地址中帶湖的，全部輸出來
16、SELECT *
FROM student
WHERE idcard IN (1,2,4,7); 查詢idcard爲1、2、4、7的全部數據
17、SELECT idcard AS id,name,age,gender,addr
FROM student 修改idcard的別名爲id顯示出來
18、SELECT student.`name`,student.age,student.addr,course.course_name,mid_stu_course.grade
FROM student
JOIN mid_stu_course ON student.idcard=mid_stu_course.idcard
JOIN course ON mid_stu_course.course_id=course.course_id
WHERE student.idcard=1; 查詢idcard爲1的學生的信息
19、SELECT student.idcard
FROM student
UNION
SELECT mid_stu_course.course_id
FROM mid_stu_course; 查詢結果並且合併結果集