Mongodb大于查询

Question

I have an employee collection like this

Company.            Ceo.       Employees
Sdr.                Siva.      1-200
Datamatica.         Durga.     200-400
Big.                Mouli.     50-100

After using

db.employee.find({Employees : {$gte : 200}}) 

I don't get any data. The Employees field type is a string.

Answer 1

As japrescott stated, you should split the Employees field into two separate fields (employees_from, employees_to) of type Number and then query like this:

db.employee.find({employees_from : {$gte : 200}})

For migration you could use mongo's map reduce to split the current Employees into two separate field and add these to your documents. Afterwards you can delete the Employees field.