I am using Mongodb’s php driver.https://docs.mongodb.com/php- …
There is an operation similar to groupby, which I do not know how to write. For example, there is a set below:
$cities=[
['id'=>'xxx','city'= >' Shenzhen',' provision' = >' Guangdong',' provision _ number' = >' 44'],
['id'=>'xxx','city'= >' Guangzhou',' provision' = >' Guangdong',' provision _ number' = >' 44'],
['id'=>'xxx','city'= >' Hangzhou',' provision' = >' Zhejiang',' provision _ number' = >' 33'],
['id'=>'xxx','city'= >' Nanjing',' provision' = >' Jiangsu',' provision _ number' = >' 32'],
['id'=>'xxx','city'= >' Suzhou',' provision' = >' Jiangsu',' provision _ number' = >' 32'],
['id'=>'xxx','city'= >' Chengdu',' provision' = >' Sichuan',' provision _ number' = >' 51'],
['id'=>'xxx','city'= >' Mianyang',' provision' = >' Sichuan',' provision _ number' = >' 51'],
];
Demand is to put insideprovince
Andprovince_number
Take it out and store it in another set. These two words are repeated. Just take one, that is, the effect of groupby in mysql. How should you write it?
I checked on the Internet and it seems to be in line with the effect you want:http://blog.csdn.net/lff0305/ …