create table ono as select c.ID,on.community,on.build_area,c.build_year,c.building_num,c.house_num,on.has_elevator from onsale on,Community c where on.ID_Community=c.ID错哪了
时间: 2024-02-15 07:02:43 浏览: 22
在这个SQL语句中,你使用了多个表并列在一起进行查询,但是没有使用任何连接条件,这将导致语法错误。正确的SQL语句应该像这样:
```
CREATE TABLE ono AS
SELECT c.ID, on.community, on.build_area, c.build_year, c.building_num, c.house_num, on.has_elevator
FROM onsale on
INNER JOIN Community c ON on.ID_Community=c.ID;
```
在这个SQL语句中,我们使用了INNER JOIN连接两个表,并使用ON子句指定了连接条件。这样就可以正确地将两个表连接起来,并创建一个名为"ono"的新表。
相关问题
帮助我在create view maxclassincome as select b.bclass,b.bname,sum(r.rquantity*b.bprice) class_total_income from book b join retailorder r on r.bno=b.bno group by b.bclass,b.bname having sum(r.rquantity*b.bprice)=(select max(r.rquantity*b.bprice) from( select b.bclass, sum(r.rquantity*b.bprice) from book b join retailorder r on b.bno=r.bno group by b.bclass )分别插入五个数据
当您需要将上述语句插入五个不同的数据时,您可以按照以下步骤进行操作:
1. 打开您的数据库管理工具(如MySQL Workbench)并连接到您的数据库。
2. 打开一个新的查询窗口。
3. 复制以下SQL语句并粘贴到查询窗口中:
```
insert into book (bno, bclass, bname, bprice) values
(1, 'Class A', 'Book A', 10),
(2, 'Class A', 'Book B', 15),
(3, 'Class B', 'Book C', 20),
(4, 'Class B', 'Book D', 25),
(5, 'Class C', 'Book E', 30);
```
4. 执行上述SQL语句,将五个数据插入到book表中。
5. 复制以下SQL语句并粘贴到查询窗口中:
```
insert into retailorder (ono, bno, rquantity) values
(1, 1, 5),
(2, 2, 10),
(3, 3, 15),
(4, 4, 20),
(5, 5, 25),
(6, 1, 30),
(7, 2, 35),
(8, 3, 40),
(9, 4, 45),
(10, 5, 50);
```
6. 执行上述SQL语句,将十个数据插入到retailorder表中。
7. 复制以下SQL语句并粘贴到查询窗口中:
```
create view maxclassincome as
select b.bclass, b.bname, sum(r.rquantity*b.bprice) class_total_income
from book b join retailorder r on r.bno=b.bno
group by b.bclass, b.bname
having sum(r.rquantity*b.bprice) = (
select max(r.rquantity*b.bprice)
from (
select b.bclass, sum(r.rquantity*b.bprice)
from book b join retailorder r on b.bno=r.bno
group by b.bclass
) t
);
```
8. 执行上述SQL语句,创建名为maxclassincome的视图,并显示结果。
python写1、创建文件,名称为"english. song”,将歌词按行输入2、将文件重命名为"my heart willgoon" 3、对文件创建副本为"back-up"4、关闭文件 文件内容为every night in my dreams, i see you, i feel youo that is how i know you go on, far across the distanceoand spaces between us, you have come to show you go ononear far, wherever you are. i believe, that the heart does go ono once more you open the door, and youre here in my heartoand myу heart will go on and on, lovel can touch us one time o
下面是Python代码实现:
```python
# 创建文件并写入歌词
with open('english.song', 'w') as f:
f.write('every night in my dreams,\n')
f.write('i see you, i feel you,\n')
f.write('that is how i know you go on,\n')
f.write('far across the distance\n')
f.write('and spaces between us,\n')
f.write('you have come to show you go on\n')
f.write('near far, wherever you are.\n')
f.write('i believe, that the heart does go on\n')
f.write('once more you open the door,\n')
f.write('and youre here in my heart\n')
f.write('and my heart will go on and on,\n')
f.write('love can touch us one time\n')
# 重命名文件
import os
os.rename('english.song', 'my heart will go on')
# 创建文件副本
import shutil
shutil.copyfile('my heart will go on', 'back-up')
# 关闭文件
f.close()
```
以上代码中,使用`with open()`语句创建并打开文件,并使用`write()`方法将歌词写入文件。然后使用`os.rename()`方法将文件重命名为"my heart will go on"。接着使用`shutil.copyfile()`方法创建文件副本"back-up"。最后使用`close()`方法关闭文件。