Multiple conditions inside match MongoDB - sql

Question

I want to convert the following SQL query to MongoDB query:
SELECT count(invoiceNo), year, month, manager
FROM battle
WHERE year=2021 AND month='Dec' OR year=2022 AND month='Jan' AND manager = 'name#test.com'
GROUP BY year,month;
I've tried to do so, but it seems to be incorrect:
const getNoOfOrders = await BattlefieldInfo.aggregate([
{
$match: {
$and: [
{
year: periodDate[0]['year']
},
{ month: periodDate[0]['month'] }
],
$or: [
{
$and: [
{
year: prevYear
},
{ month: prevMonth }
]
}
],
$and: [{ manager: email }]
}
},
{
$group: {
_id: '$month'
}
},
{
$project: {
// noOfOrders: { $count: '$invoiceNo' },
month: 1,
year: 1,
manager: 1
}
}
]);
Because I am getting an empty array. But it should be something like this:
| count(invoiceNo) | manager | year | month |
+------------------+---------------+------+-------+
2 name#test.com 2021 Dec
3 name#test.com 2022 Jan

Answer 1

From my point of view, I think parenthesis (bracket) is important to group the conditions together such as month and year.
SELECT count(invoiceNo), `year`, month, manager
FROM battle
WHERE (`year` = 2021 AND month = 'Dec')
OR (`year` = 2022 AND month = 'Jan')
AND manager = 'abc#email.com'
GROUP BY month, `year`
Sample DBFiddle
Same goes for your MongoDB query. While to search with month and year, you can do without $and as below:
{
year: 2021,
month: "Dec"
}
Instead of:
$and: [
{
year: 2021
},
{
month: "Dec"
}
]
And make sure that $group stage need an accumulator operator:
noOfOrders: {
$count: {}
}
Or
noOfOrders: {
$sum: 1
}
Complete MongoDB query
db.collection.aggregate([
{
$match: {
$or: [
{
year: 2021,
month: "Dec"
},
{
year: 2022,
month: "Jan"
}
],
manager: "abc#email.com"
}
},
{
$group: {
_id: {
month: "$month",
year: "$year"
},
noOfOrders: {
$count: {}
},
manager: {
$first: "$manager"
}
}
},
{
$project: {
_id: 0,
noOfOrders: 1,
month: "$_id.month",
year: "$_id.year",
manager: "$manager"
}
}
])
Sample Mongo Playground
Note:
Would be great for both queries to add manager as one of the group keys. Since you are filtering for the specific (only one) manager's record(s), it's fine. But without filtering for specific manager, your query will result in the wrong output.