更新具有计数条件要求的属性值

Question

我有来自查询的数据查询结果

select count(type_of_vegetation)as count,type_of_vegetation 
from tb_patrol 
group by type_of_vegetation

如下图所示：

count | type of vegetation    
1     | Semak Belukar, Pepohonan   
2     | Pakis, Sawit, Senduduk     
1     | Pakis, Sawit, Ilalang, Akasia   
49    | Sawit    
15    | Pakis, Karet   
17    | Semak Belukar

我想更新＆＃34;植被类型的价值＆＃34;其数量小于15的人数＆＃34;其他＆＃34;但是按照植被类型的条件组，如下例所示：

count | type of vegetation    
1     | Others   
2     | Others    
1     | Others
49    | Sawit
15    | Pakis, Karet
17    | Semak Belukar

我使用postgres SQL。

Answer 1

使用子查询和IN运算符：

UPDATE tb_patrol 
SET type_of_vegetation = 'Other'
WHERE type_of_vegetation  IN (
   select type_of_vegetation 
   from tb_patrol 
   group by type_of_vegetation
   having count(type_of_vegetation) < 15
);