SQL to Aggregation Mapping Chart¶
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The aggregation pipeline allowsMongoDB to provide native aggregation capabilities that corresponds tomany common data aggregation operations in SQL.
The following table provides an overview of common SQL aggregationterms, functions, and concepts and the corresponding MongoDBaggregation operators:
SQL Terms, Functions, and Concepts | MongoDB Aggregation Operators |
---|---|
WHERE | $match |
GROUP BY | $group |
HAVING | $match |
SELECT | $project |
ORDER BY | $sort |
LIMIT | $limit |
SUM() | $sum |
COUNT() | $sum |
join |
New in version 3.2. |
Examples
The following table presents a quick reference of SQL aggregationstatements and the corresponding MongoDB statements. The examples inthe table assume the following conditions:
-
The SQL examples assume two tables, orders andorder_lineitem that join by theorder_lineitem.order_id andtheorders.id columns.
-
The MongoDB examples assume one collection orders that containdocuments of the following prototype:
{ cust_id: "abc123", ord_date: ISODate("2012-11-02T17:04:11.102Z"), status: 'A', price: 50, items: [ { sku: "xxx", qty: 25, price: 1 }, { sku: "yyy", qty: 25, price: 1 } ] }
SQL Example | MongoDB Example | Description |
---|---|---|
SELECT COUNT(*) AS count
FROM orders
|
db.orders.aggregate( [
{
$group: {
_id: null,
count: { $sum: 1 }
}
}
] )
| Count all recordsfrom orders |
SELECT SUM(price) AS total
FROM orders
|
db.orders.aggregate( [
{
$group: {
_id: null,
total: { $sum: "$price" }
}
}
] )
| Sum the price fieldfromorders |
SELECT cust_id,
SUM(price) AS total
FROM orders
GROUP BY cust_id
|
db.orders.aggregate( [
{
$group: {
_id: "$cust_id",
total: { $sum: "$price" }
}
}
] )
| For each unique cust_id,sum theprice field. |
SELECT cust_id,
SUM(price) AS total
FROM orders
GROUP BY cust_id
ORDER BY total
|
db.orders.aggregate( [
{
$group: {
_id: "$cust_id",
total: { $sum: "$price" }
}
},
{ $sort: { total: 1 } }
] )
| For each unique cust_id,sum theprice field,results sorted by sum. |
SELECT cust_id,
ord_date,
SUM(price) AS total
FROM orders
GROUP BY cust_id,
ord_date
|
db.orders.aggregate( [
{
$group: {
_id: {
cust_id: "$cust_id",
ord_date: {
month: { $month: "$ord_date" },
day: { $dayOfMonth: "$ord_date" },
year: { $year: "$ord_date"}
}
},
total: { $sum: "$price" }
}
}
] )
| For each uniquecust_id,ord_date grouping,sum theprice field.Excludes the time portion of the date. |
SELECT cust_id,
count(*)
FROM orders
GROUP BY cust_id
HAVING count(*) > 1
|
db.orders.aggregate( [
{
$group: {
_id: "$cust_id",
count: { $sum: 1 }
}
},
{ $match: { count: { $gt: 1 } } }
] )
| For cust_id with multiple records,return thecust_id andthe corresponding record count. |
SELECT cust_id,
ord_date,
SUM(price) AS total
FROM orders
GROUP BY cust_id,
ord_date
HAVING total > 250
|
db.orders.aggregate( [
{
$group: {
_id: {
cust_id: "$cust_id",
ord_date: {
month: { $month: "$ord_date" },
day: { $dayOfMonth: "$ord_date" },
year: { $year: "$ord_date"}
}
},
total: { $sum: "$price" }
}
},
{ $match: { total: { $gt: 250 } } }
] )
| For each unique cust_id,ord_dategrouping, sum theprice fieldand return only where thesum is greater than 250.Excludes the time portion of the date. |
SELECT cust_id,
SUM(price) as total
FROM orders
WHERE status = 'A'
GROUP BY cust_id
|
db.orders.aggregate( [
{ $match: { status: 'A' } },
{
$group: {
_id: "$cust_id",
total: { $sum: "$price" }
}
}
] )
| For each unique cust_idwith statusA,sum the price field. |
SELECT cust_id,
SUM(price) as total
FROM orders
WHERE status = 'A'
GROUP BY cust_id
HAVING total > 250
|
db.orders.aggregate( [
{ $match: { status: 'A' } },
{
$group: {
_id: "$cust_id",
total: { $sum: "$price" }
}
},
{ $match: { total: { $gt: 250 } } }
] )
| For each unique cust_idwith statusA,sum the price field and returnonly where thesum is greater than 250. |
SELECT cust_id,
SUM(li.qty) as qty
FROM orders o,
order_lineitem li
WHERE li.order_id = o.id
GROUP BY cust_id
|
db.orders.aggregate( [
{ $unwind: "$items" },
{
$group: {
_id: "$cust_id",
qty: { $sum: "$items.qty" }
}
}
] )
| For each unique cust_id,sum the correspondingline itemqty fieldsassociated with theorders. |
SELECT COUNT(*)
FROM (SELECT cust_id,
ord_date
FROM orders
GROUP BY cust_id,
ord_date)
as DerivedTable
|
db.orders.aggregate( [
{
$group: {
_id: {
cust_id: "$cust_id",
ord_date: {
month: { $month: "$ord_date" },
day: { $dayOfMonth: "$ord_date" },
year: { $year: "$ord_date"}
}
}
}
},
{
$group: {
_id: null,
count: { $sum: 1 }
}
}
] )
| Count the number of distinctcust_id,ord_date groupings.Excludes the time portion of the date. |