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I have two tables: employee and department table. I want to join these two tables like the SQL query below.
SELECT employee.name,department.deptname FROM employee, department WHERE employee.deptid = department.id AND employee.country = 'Germany' AND department.deptname in ('IT', 'HR')
How to combine these two tables based on the condition?
db.Employee.aggregate([ { $match: { country: "Germany" }}, { $lookup: { from: "Department", let: { deptid: { "$toObjectId": "$deptid" }}, pipeline: [ { $match: { deptname: { $in: ["IT","HR"]}, $expr: { $eq: ["$_id", "$$deptid"] }}}], as: "Department" }}, { $unwind: "$Department" }])You can use correlated subquery if deptid is an ObjectId.