Create index on MongoDB
#Create index on employees table with column employee_id in ascending order
db.employees.ensureIndex( { emp_id: 1 } )
In SQL:
create index on idx_emp on employees (emp_id);
# create index on employees table with column emp_id and age(desc order)
db.employees.ensureIndex( { emp_id: 1, age: -1 } )
In SQL:
create index on idx_emp1 on employees(emp_id,age desc);
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