MySQL语句

# drop databases if exists rweb_sql;
create database rweb_sql character set utf8;
use rweb_sql;#
DROP TABLE IF EXISTS tb_emp1;
CREATE TABLE tb_emp1(
id INT(32) PRIMARY KEY,name VARCHAR(25) NOT NULL,deptId VARCHAR(32) NOT NULL,salary FLOAT);#
DROP TABLE IF EXISTS study_1;
CREATE TABLE study_1(
f_id CHAR(10) NOT NULL,
s_id INT NOT NULL,
f_name char(255) NOT NULL,
f_price DECIMAL(8,2) NOT NULL,
f_type char(100) NOT NULL,
PRIMARY KEY(f_id)
);INSERT INTO study_1(f_id,s_id,f_name,f_price,f_type) VALUES
('001' , 101 , '苹果' , 9.2,'fruit'),
('002' , 101 , '黑莓' , 10.2,'fruit'),
('003' , 102 , '橘子' , 3.2,'fruit'),
('004' , 103 , '香蕉' , 2.2,'fruit'),
('005' , 102 , '火龙果' , 6.3,'fruit'),
('006' , 102 , '葡萄' , 5.3,'fruit'),
('007' , 103 , '橙子' , 9.2,'fruit'),
('008' , 101 , '西瓜' , 7.2,'fruit'),
('009' , 104 , '香瓜' , 6.4,'fruit'),
('010' , 105 , '果粒橙' , 3,'drink'),
('011' , 105 , '乐橙' , 3,'drink'),
('012' , 105 , '开心果粒橙' , 3,'drink'),
('013' , 106 , '可口可乐' , 4,'drink'),
('014' , 107 , '百世可乐' , 4,'drink'),
('015' , 108 , '鸡尾酒' , 32,'wine'),
('016' , 109 , '合力葡萄酒' , 66,'wine'),
('017' , 109 , '飞悦葡萄酒' , 66,'wine'),
('018' , 110 , '开心葡萄酒' , 67,'wine')
;DROP TABLE IF EXISTS study_2;
CREATE TABLE study_2(p_id CHAR(10) NOT NULL,f_id INT NOT NULL,p_name VARCHAR(100) NOT NULL,p_star int not null ,PRIMARY KEY(p_id)
);
INSERT INTO study_2(p_id, f_id,p_name,p_star) VALUES
('p001' , 101 , 'D1生产厂家',3),
('p002' , 102 , 'D2生产厂家',4),
('p003' , 103 , 'D3生产厂家',3),
('p004' , 104 , 'D4生产厂家',5),
('p005' , 105 , 'D5生产厂家',5),
('p006' , 106 , 'D6生产厂家',2),
('p007' , 107 , 'D7生产厂家',2),
('p008' , 108 , 'D8生产厂家',3),
('p009' , 109 , 'D9生产厂家',4),
('p011' , 111 , 'D11生产厂家',2)
;
#

##-----------单表查询
select f_name,f_price from study_1 ;
##desc 降序 大到小，倒金字塔排序
select s_id,f_name,f_price from study_1 order by s_id desc;##asc升序 默认 可以不写，金字塔排序
select s_id,f_name,f_price from study_1 order by s_id asc ;select s_id,f_name,f_price from study_1 order by f_price desc;select s_id,f_name,f_price from study_1 order by s_id desc ,f_price desc ;select s_id,f_name,f_price from study_1 order by f_price desc,s_id desc ;select f_name,f_price from study_1 where f_price between 6 and 9;##聚合函数 sum count avg max min
select s_id ,count(*) as 根据s_id分组的总数 from study_1 group by s_id;select s_id ,sum(f_price) as 根据s_id分组sum函数f_price函数体 from study_1 group by s_id;select s_id ,avg(f_price) as 根据s_id分组求分组的f_price平均值 from study_1 group by s_id;select max(f_price) as f_price最大值 from study_1;select min(f_price) as f_price最大值 from study_1;##错误示例 不能加f_name
##select f_name,max(f_price) as f_price最大值 from study_1;select f_type,count(*) as 根据f_type分组的总数 from study_1 group by f_type having count(*)>3;##查询s_id满足在(102,106,108)
select s_id,f_name from study_1
where s_id in (102,106,108);select s_id ,count(*) as 求s_id满足条件的总数包括空值 from study_1 where s_id in (102,106,108)
group by s_id;select s_id ,count(s_id) as 求s_id满足条件且值不为空总数 from study_1 where s_id in (102,106,108)
group by s_id;select s_id ,sum(s_id) as 求s_id满足条件的和 from study_1 where s_id in (102,106,108)
group by s_id;
##错误示范  不能添加f_name
##select f_name, s_id ,count(*) as 根据s_id分组的总数 from study_1 where s_id in (102,106,108)
##group by s_id;##-----------表连接查询##左连接
select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格 from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id;##右连接
select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格 from study_1 as 产品列表right join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id;##内连接，inner可以不写
select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格 from study_1 as 产品列表join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id;### 生产厂家.p_star>3
select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格
from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id
where 生产厂家.p_star>3;##  根据f_type 获取 生产厂家.p_star>3的分组
select f_type as 产品类型, count(*) as 根据f_type分组的总数
from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id where 生产厂家.p_star>3
group by f_type;## 根据f_type 获取 生产厂家.p_star>3的分组并且 分组数和大于3
select f_type as 产品类型, count(*) as 根据f_type分组的总数
from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id where 生产厂家.p_star>3
group by f_type having count(*)>3;##-------子查询 in、 not in 、exists、 not exists、= 、!=
##根据生产厂家ID查询其f_id，再跟具f_id查询其f_nameselect f_name as 产品名称from study_1where s_id in(select f_id from study_2 where p_id='p002');
##多个字段
select f_id 产品id,s_id as 生产厂家p002对应的f_id ,f_name as 产品名称
from study_1 where s_id in(select f_id from study_2 where p_id='p002');
##sum求和返回必然是一行数据，所以不能添加其他数据库查询字段
select s_id as 生产厂家p002对应的f_id ,sum(s_id) as 求s_id的sum和
from study_1 where s_id in
(select f_id from study_2 where p_id='p002');
##原因同sum
select s_id as 生产厂家p002对应的f_id ,count(s_id) as 求s_id的列数不包括null
from study_1 where s_id in
(select f_id from study_2 where p_id='p002');
## union 、union all

完整控制台输出

E:\soft-dev-workspace\IDEA201911\rwebserver\Rweb_sql.sql
-----------执行过程
mysql> select f_name,f_price from study_1 ;
+------------+---------+
| f_name     | f_price |
+------------+---------+
| 苹果       | 9.20    |
| 黑莓       | 10.20   |
| 橘子       | 3.20    |
| 香蕉       | 2.20    |
| 火龙果     | 6.30    |
| 葡萄       | 5.30    |
| 橙子       | 9.20    |
| 西瓜       | 7.20    |
| 香瓜       | 6.40    |
| 果粒橙     | 3.00    |
| 乐橙       | 3.00    |
| 开心果粒橙 | 3.00    |
| 可口可乐   | 4.00    |
| 百世可乐   | 4.00    |
| 鸡尾酒     | 32.00   |
| 合力葡萄酒 | 66.00   |
| 飞悦葡萄酒 | 66.00   |
| 开心葡萄酒 | 67.00   |
+------------+---------+
18 rows in set (0.08 sec)mysql> select * from study_1;
+------+------+------------+---------+--------+
| f_id | s_id | f_name     | f_price | f_type |
+------+------+------------+---------+--------+
| 001  |  101 | 苹果       | 9.20    | fruit  |
| 002  |  101 | 黑莓       | 10.20   | fruit  |
| 003  |  102 | 橘子       | 3.20    | fruit  |
| 004  |  103 | 香蕉       | 2.20    | fruit  |
| 005  |  102 | 火龙果     | 6.30    | fruit  |
| 006  |  102 | 葡萄       | 5.30    | fruit  |
| 007  |  103 | 橙子       | 9.20    | fruit  |
| 008  |  101 | 西瓜       | 7.20    | fruit  |
| 009  |  104 | 香瓜       | 6.40    | fruit  |
| 010  |  105 | 果粒橙     | 3.00    | drink  |
| 011  |  105 | 乐橙       | 3.00    | drink  |
| 012  |  105 | 开心果粒橙 | 3.00    | drink  |
| 013  |  106 | 可口可乐   | 4.00    | drink  |
| 014  |  107 | 百世可乐   | 4.00    | drink  |
| 015  |  108 | 鸡尾酒     | 32.00   | wine   |
| 016  |  109 | 合力葡萄酒 | 66.00   | wine   |
| 017  |  109 | 飞悦葡萄酒 | 66.00   | wine   |
| 018  |  110 | 开心葡萄酒 | 67.00   | wine   |
+------+------+------------+---------+--------+
18 rows in set (0.10 sec)mysql> select * from study_2;
+------+------+-------------+--------+
| p_id | f_id | p_name      | p_star |
+------+------+-------------+--------+
| p001 |  101 | D1生产厂家  |      3 |
| p002 |  102 | D2生产厂家  |      4 |
| p003 |  103 | D3生产厂家  |      3 |
| p004 |  104 | D4生产厂家  |      5 |
| p005 |  105 | D5生产厂家  |      5 |
| p006 |  106 | D6生产厂家  |      2 |
| p007 |  107 | D7生产厂家  |      2 |
| p008 |  108 | D8生产厂家  |      3 |
| p009 |  109 | D9生产厂家  |      4 |
| p011 |  111 | D11生产厂家 |      2 |
+------+------+-------------+--------+
10 rows in set (0.13 sec)mysql> select s_id,f_name,f_price from study_1 order by s_id desc;
+------+------------+---------+
| s_id | f_name     | f_price |
+------+------------+---------+
|  110 | 开心葡萄酒 | 67.00   |
|  109 | 合力葡萄酒 | 66.00   |
|  109 | 飞悦葡萄酒 | 66.00   |
|  108 | 鸡尾酒     | 32.00   |
|  107 | 百世可乐   | 4.00    |
|  106 | 可口可乐   | 4.00    |
|  105 | 果粒橙     | 3.00    |
|  105 | 乐橙       | 3.00    |
|  105 | 开心果粒橙 | 3.00    |
|  104 | 香瓜       | 6.40    |
|  103 | 香蕉       | 2.20    |
|  103 | 橙子       | 9.20    |
|  102 | 橘子       | 3.20    |
|  102 | 火龙果     | 6.30    |
|  102 | 葡萄       | 5.30    |
|  101 | 苹果       | 9.20    |
|  101 | 黑莓       | 10.20   |
|  101 | 西瓜       | 7.20    |
+------+------------+---------+
18 rows in set (0.13 sec)mysql> select s_id,f_name,f_price from study_1 order by s_id desc ,f_price desc ;
+------+------------+---------+
| s_id | f_name     | f_price |
+------+------------+---------+
|  110 | 开心葡萄酒 | 67.00   |
|  109 | 合力葡萄酒 | 66.00   |
|  109 | 飞悦葡萄酒 | 66.00   |
|  108 | 鸡尾酒     | 32.00   |
|  107 | 百世可乐   | 4.00    |
|  106 | 可口可乐   | 4.00    |
|  105 | 果粒橙     | 3.00    |
|  105 | 乐橙       | 3.00    |
|  105 | 开心果粒橙 | 3.00    |
|  104 | 香瓜       | 6.40    |
|  103 | 橙子       | 9.20    |
|  103 | 香蕉       | 2.20    |
|  102 | 火龙果     | 6.30    |
|  102 | 葡萄       | 5.30    |
|  102 | 橘子       | 3.20    |
|  101 | 黑莓       | 10.20   |
|  101 | 苹果       | 9.20    |
|  101 | 西瓜       | 7.20    |
+------+------------+---------+
18 rows in set (0.07 sec)mysql> select s_id,f_name,f_price from study_1 order by f_price desc,s_id desc ;
+------+------------+---------+
| s_id | f_name     | f_price |
+------+------------+---------+
|  110 | 开心葡萄酒 | 67.00   |
|  109 | 合力葡萄酒 | 66.00   |
|  109 | 飞悦葡萄酒 | 66.00   |
|  108 | 鸡尾酒     | 32.00   |
|  101 | 黑莓       | 10.20   |
|  103 | 橙子       | 9.20    |
|  101 | 苹果       | 9.20    |
|  101 | 西瓜       | 7.20    |
|  104 | 香瓜       | 6.40    |
|  102 | 火龙果     | 6.30    |
|  102 | 葡萄       | 5.30    |
|  107 | 百世可乐   | 4.00    |
|  106 | 可口可乐   | 4.00    |
|  102 | 橘子       | 3.20    |
|  105 | 果粒橙     | 3.00    |
|  105 | 乐橙       | 3.00    |
|  105 | 开心果粒橙 | 3.00    |
|  103 | 香蕉       | 2.20    |
+------+------------+---------+
18 rows in set (0.09 sec)mysql> select f_name,f_price from study_1 where f_price between 6 and 9;
+--------+---------+
| f_name | f_price |
+--------+---------+
| 火龙果 | 6.30    |
| 西瓜   | 7.20    |
| 香瓜   | 6.40    |
+--------+---------+
3 rows in set (0.07 sec)mysql> select s_id ,count(*) as 根据s_id分组的总数 from study_1 group by s_id;
+------+--------------------+
| s_id | 根据s_id分组的总数 |
+------+--------------------+
|  101 |                  3 |
|  102 |                  3 |
|  103 |                  2 |
|  104 |                  1 |
|  105 |                  3 |
|  106 |                  1 |
|  107 |                  1 |
|  108 |                  1 |
|  109 |                  2 |
|  110 |                  1 |
+------+--------------------+
10 rows in set (0.07 sec)mysql> select s_id ,sum(f_price) as 根据s_id分组sum函数f_price函数体 from study_1 group by s_id;
+------+----------------------------------+
| s_id | 根据s_id分组sum函数f_price函数体 |
+------+----------------------------------+
|  101 | 26.60                            |
|  102 | 14.80                            |
|  103 | 11.40                            |
|  104 | 6.40                             |
|  105 | 9.00                             |
|  106 | 4.00                             |
|  107 | 4.00                             |
|  108 | 32.00                            |
|  109 | 132.00                           |
|  110 | 67.00                            |
+------+----------------------------------+
10 rows in set (0.06 sec)mysql> select s_id ,avg(f_price) as 根据s_id分组求分组的f_price平均值 from study_1 group by s_id;
+------+-----------------------------------+
| s_id | 根据s_id分组求分组的f_price平均值 |
+------+-----------------------------------+
|  101 | 8.866667                          |
|  102 | 4.933333                          |
|  103 | 5.700000                          |
|  104 | 6.400000                          |
|  105 | 3.000000                          |
|  106 | 4.000000                          |
|  107 | 4.000000                          |
|  108 | 32.000000                         |
|  109 | 66.000000                         |
|  110 | 67.000000                         |
+------+-----------------------------------+
10 rows in set (0.06 sec)mysql> select max(f_price) as f_price最大值 from study_1;
+---------------+
| f_price最大值 |
+---------------+
| 67.00         |
+---------------+
1 row in set (0.04 sec)mysql> select min(f_price) as f_price最大值 from study_1;
+---------------+
| f_price最大值 |
+---------------+
| 2.20          |
+---------------+
1 row in set (0.05 sec)mysql> select f_type,count(*) as 根据f_type分组的总数 from study_1 group by f_type having count(*)>3;
+--------+----------------------+
| f_type | 根据f_type分组的总数 |
+--------+----------------------+
| fruit  |                    9 |
| drink  |                    5 |
| wine   |                    4 |
+--------+----------------------+
3 rows in set (0.05 sec)mysql> select s_id,f_name from study_1
where s_id in (102,106,108);
+------+----------+
| s_id | f_name   |
+------+----------+
|  102 | 橘子     |
|  102 | 火龙果   |
|  102 | 葡萄     |
|  106 | 可口可乐 |
|  108 | 鸡尾酒   |
+------+----------+
5 rows in set (0.04 sec)mysql> select s_id ,count(*) as 求s_id满足条件的总数包括空值 from study_1 where s_id in (102,106,108)
group by s_id;
+------+------------------------------+
| s_id | 求s_id满足条件的总数包括空值 |
+------+------------------------------+
|  102 |                            3 |
|  106 |                            1 |
|  108 |                            1 |
+------+------------------------------+
3 rows in set (0.05 sec)mysql> select s_id ,count(s_id) as 求s_id满足条件且值不为空总数 from study_1 where s_id in (102,106,108)
group by s_id;
+------+------------------------------+
| s_id | 求s_id满足条件且值不为空总数 |
+------+------------------------------+
|  102 |                            3 |
|  106 |                            1 |
|  108 |                            1 |
+------+------------------------------+
3 rows in set (0.04 sec)mysql> select s_id ,sum(s_id) as 求s_id满足条件的和 from study_1 where s_id in (102,106,108)
group by s_id;
+------+--------------------+
| s_id | 求s_id满足条件的和 |
+------+--------------------+
|  102 | 306                |
|  106 | 106                |
|  108 | 108                |
+------+--------------------+
3 rows in set (0.04 sec)mysql> select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格 from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id;
+------------+------------+----------+
| 生产厂家ID | 产品名称   | 产品价格 |
+------------+------------+----------+
|        101 | 苹果       | 9.20     |
|        101 | 黑莓       | 10.20    |
|        101 | 西瓜       | 7.20     |
|        102 | 橘子       | 3.20     |
|        102 | 火龙果     | 6.30     |
|        102 | 葡萄       | 5.30     |
|        103 | 香蕉       | 2.20     |
|        103 | 橙子       | 9.20     |
|        104 | 香瓜       | 6.40     |
|        105 | 果粒橙     | 3.00     |
|        105 | 乐橙       | 3.00     |
|        105 | 开心果粒橙 | 3.00     |
|        106 | 可口可乐   | 4.00     |
|        107 | 百世可乐   | 4.00     |
|        108 | 鸡尾酒     | 32.00    |
|        109 | 合力葡萄酒 | 66.00    |
|        109 | 飞悦葡萄酒 | 66.00    |
|        110 | 开心葡萄酒 | 67.00    |
+------------+------------+----------+
18 rows in set (0.08 sec)mysql> select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格 from study_1 as 产品列表right join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id;
+------------+------------+----------+
| 生产厂家ID | 产品名称   | 产品价格 |
+------------+------------+----------+
|        101 | 苹果       | 9.20     |
|        101 | 黑莓       | 10.20    |
|        102 | 橘子       | 3.20     |
|        103 | 香蕉       | 2.20     |
|        102 | 火龙果     | 6.30     |
|        102 | 葡萄       | 5.30     |
|        103 | 橙子       | 9.20     |
|        101 | 西瓜       | 7.20     |
|        104 | 香瓜       | 6.40     |
|        105 | 果粒橙     | 3.00     |
|        105 | 乐橙       | 3.00     |
|        105 | 开心果粒橙 | 3.00     |
|        106 | 可口可乐   | 4.00     |
|        107 | 百世可乐   | 4.00     |
|        108 | 鸡尾酒     | 32.00    |
|        109 | 合力葡萄酒 | 66.00    |
|        109 | 飞悦葡萄酒 | 66.00    |
| NULL       | NULL       | NULL     |
+------------+------------+----------+
18 rows in set (0.09 sec)mysql> select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格 from study_1 as 产品列表join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id;
+------------+------------+----------+
| 生产厂家ID | 产品名称   | 产品价格 |
+------------+------------+----------+
|        101 | 苹果       | 9.20     |
|        101 | 黑莓       | 10.20    |
|        102 | 橘子       | 3.20     |
|        103 | 香蕉       | 2.20     |
|        102 | 火龙果     | 6.30     |
|        102 | 葡萄       | 5.30     |
|        103 | 橙子       | 9.20     |
|        101 | 西瓜       | 7.20     |
|        104 | 香瓜       | 6.40     |
|        105 | 果粒橙     | 3.00     |
|        105 | 乐橙       | 3.00     |
|        105 | 开心果粒橙 | 3.00     |
|        106 | 可口可乐   | 4.00     |
|        107 | 百世可乐   | 4.00     |
|        108 | 鸡尾酒     | 32.00    |
|        109 | 合力葡萄酒 | 66.00    |
|        109 | 飞悦葡萄酒 | 66.00    |
+------------+------------+----------+
17 rows in set (0.08 sec)mysql> select s_id as 生产厂家ID,f_name as 产品名称,f_price 产品价格
from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id
where 生产厂家.p_star>3;
+------------+------------+----------+
| 生产厂家ID | 产品名称   | 产品价格 |
+------------+------------+----------+
|        102 | 橘子       | 3.20     |
|        102 | 火龙果     | 6.30     |
|        102 | 葡萄       | 5.30     |
|        104 | 香瓜       | 6.40     |
|        105 | 果粒橙     | 3.00     |
|        105 | 乐橙       | 3.00     |
|        105 | 开心果粒橙 | 3.00     |
|        109 | 合力葡萄酒 | 66.00    |
|        109 | 飞悦葡萄酒 | 66.00    |
+------------+------------+----------+
9 rows in set (0.10 sec)mysql> select f_type as 产品类型, count(*) as 根据f_type分组的总数
from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id where 生产厂家.p_star>3
group by f_type;
+----------+----------------------+
| 产品类型 | 根据f_type分组的总数 |
+----------+----------------------+
| fruit    |                    4 |
| drink    |                    3 |
| wine     |                    2 |
+----------+----------------------+
3 rows in set (0.07 sec)mysql> select f_type as 产品类型, count(*) as 根据f_type分组的总数
from study_1 as 产品列表left join study_2 as生产厂家 on 产品列表.s_id= 生产厂家.f_id where 生产厂家.p_star>3
group by f_type having count(*)>3;
+----------+----------------------+
| 产品类型 | 根据f_type分组的总数 |
+----------+----------------------+
| fruit    |                    4 |
+----------+----------------------+
1 row in set (0.07 sec)mysql> select f_name as 产品名称from study_1where s_id in(select f_id from study_2 where p_id='p002');
+----------+
| 产品名称 |
+----------+
| 橘子     |
| 火龙果   |
| 葡萄     |
+----------+
3 rows in set (0.06 sec)mysql> select f_id 产品id,s_id as 生产厂家p002对应的f_id ,f_name as 产品名称
from study_1 where s_id in(select f_id from study_2 where p_id='p002');
+--------+------------------------+----------+
| 产品id | 生产厂家p002对应的f_id | 产品名称 |
+--------+------------------------+----------+
| 003    |                    102 | 橘子     |
| 005    |                    102 | 火龙果   |
| 006    |                    102 | 葡萄     |
+--------+------------------------+----------+
3 rows in set (0.06 sec)mysql> select s_id as 生产厂家p002对应的f_id ,sum(s_id) as 求s_id的sum和
from study_1 where s_id in
(select f_id from study_2 where p_id='p002');
+------------------------+---------------+
| 生产厂家p002对应的f_id | 求s_id的sum和 |
+------------------------+---------------+
|                    102 | 306           |
+------------------------+---------------+
1 row in set (0.06 sec)mysql> select s_id as 生产厂家p002对应的f_id ,count(s_id) as 求s_id的列数不包括null
from study_1 where s_id in
(select f_id from study_2 where p_id='p002');
+------------------------+------------------------+
| 生产厂家p002对应的f_id | 求s_id的列数不包括null |
+------------------------+------------------------+
|                    102 |                      3 |
+------------------------+------------------------+
1 row in set (0.07 sec)

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