有一首英文女生歌，很悲伤 旋律缓缓的， 里面有一句歌词叫 it's the time to say goodbye my friemds

Guangzhou is the third big city in China It is a beautiful city with green trees and grass, and it is named as the flower city It's central city of our country and it's the capital of Guangdong Province Guangzhou is a big city with a population of more than 127 millions Almost half of them are non-native population They go to Guangzhou to find a job,because Guangzhou。。

更多可以去英语作文网 >

可以用到自定义函数，

create or replace FUNCTION g2(v NUMBER) RETURN INT IS

TYPE it IS TABLE OF INT;

BEGIN

IF v>0 AND v<= 500 THEN

RETURN 1;

ELSIF v>500 AND v<= 1000 THEN

RETURN 2;

ELSIF v>1000 AND v<= 5000 THEN

RETURN 3;

ELSIF v>5000 AND v<= 20000 THEN

RETURN 4;

ELSE

RETURN 0;

END IF;

END g2;

/

select g2(id) f, count(1) cnt from t1 group by g2(id) order by 1;

F CNT

---------- ----------

1 500

2 500

3 4000

4 15000

当然，我们也可以不借助函数，而用case when语句实现同样的条件分组，但是语句比较冗长，列名是固定的。不利于阅读与修改，也不利于代码重用。

select (case

when id >0 AND id<= 500 THEN 1

when id >500 AND id<= 1000 THEN 2

when id >1000 AND id<= 5000 THEN 3

when id >5000 AND id<= 20000 THEN 4

else 0

end) f,

count(1) cnt from t1 group by

(case

when id >0 AND id<= 500 THEN 1

when id >500 AND id<= 1000 THEN 2

when id >1000 AND id<= 5000 THEN 3

when id >5000 AND id<= 20000 THEN 4

else 0

end)

order by 1;

F CNT

---------- ----------

1 500

2 500

3 4000

4 15000

在files tube的网页上输入了你写的歌词，找到几个结果，除了你已经说了不是的那几个，就剩下这首比较像了，我把歌词的网页发给你，你看看是这首吗？

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