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@ -3,15 +3,15 @@
<nav> <nav>
<a href="#一聚合简述">一、聚合简述</a><br/> <a href="#一聚合简述">一、聚合简述</a><br/>
<a href="#二聚合管道">二、聚合管道</a><br/> <a href="#二聚合管道">二、聚合管道</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#11-$match">1.1 $match</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#11-match">1.1 $match</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#12-$project">1.2 $project</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#12-project">1.2 $project</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#13-$group">1.3 $group</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#13-group">1.3 $group</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#14-$unwind">1.4 $unwind</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#14-unwind">1.4 $unwind</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#15-$sort">1.5 $sort</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#15-sort">1.5 $sort</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#16-$limit">1.6 $limit</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#16-limit">1.6 $limit</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#17-$skip">1.7 $skip</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#17-skip">1.7 $skip</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#18-$lookup">1.8 $lookup</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#18-lookup">1.8 $lookup</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#19-$out">1.9 $out</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#19-out">1.9 $out</a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#110-自动优化">1.10 自动优化</a><br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#110-自动优化">1.10 自动优化</a><br/>
<a href="#三MapReduce">三、MapReduce</a><br/> <a href="#三MapReduce">三、MapReduce</a><br/>
<a href="#四单用途聚合方法">四、单用途聚合方法</a><br/> <a href="#四单用途聚合方法">四、单用途聚合方法</a><br/>
@ -415,31 +415,31 @@ db.employees.aggregate([
....... .......
], ],
"emps_title" : [ "emps_title" : [
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a5"), "_id" : ObjectId("5d4011728ba16934ccce99a5"),
"emp_no" : 10001, "emp_no" : 10001,
"title" : "Senior Engineer" "title" : "Senior Engineer"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a6"), "_id" : ObjectId("5d4011728ba16934ccce99a6"),
"emp_no" : 10002, "emp_no" : 10002,
"title" : "Staff" "title" : "Staff"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a7"), "_id" : ObjectId("5d4011728ba16934ccce99a7"),
"emp_no" : 10003, "emp_no" : 10003,
"title" : "Senior Engineer" "title" : "Senior Engineer"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a8"), "_id" : ObjectId("5d4011728ba16934ccce99a8"),
"emp_no" : 10004, "emp_no" : 10004,
"title" : "Engineer" "title" : "Engineer"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a9"), "_id" : ObjectId("5d4011728ba16934ccce99a9"),
"emp_no" : 10004, "emp_no" : 10004,
"title" : "Senior Engineer" "title" : "Senior Engineer"
} }
] ]
}, },
@ -447,31 +447,31 @@ db.employees.aggregate([
"_id" : ObjectId("5d3ffaaa8ba16934ccce99a2"), "_id" : ObjectId("5d3ffaaa8ba16934ccce99a2"),
....... .......
"emps_title" : [ "emps_title" : [
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a5"), "_id" : ObjectId("5d4011728ba16934ccce99a5"),
"emp_no" : 10001, "emp_no" : 10001,
"title" : "Senior Engineer" "title" : "Senior Engineer"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a6"), "_id" : ObjectId("5d4011728ba16934ccce99a6"),
"emp_no" : 10002, "emp_no" : 10002,
"title" : "Staff" "title" : "Staff"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a7"), "_id" : ObjectId("5d4011728ba16934ccce99a7"),
"emp_no" : 10003, "emp_no" : 10003,
"title" : "Senior Engineer" "title" : "Senior Engineer"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a8"), "_id" : ObjectId("5d4011728ba16934ccce99a8"),
"emp_no" : 10004, "emp_no" : 10004,
"title" : "Engineer" "title" : "Engineer"
}, },
{ {
"_id" : ObjectId("5d4011728ba16934ccce99a9"), "_id" : ObjectId("5d4011728ba16934ccce99a9"),
"emp_no" : 10004, "emp_no" : 10004,
"title" : "Senior Engineer" "title" : "Senior Engineer"
} }
] ]
}, },
@ -580,12 +580,12 @@ db.employees.mapReduce(
```text ```text
{ {
"_id" : "F", "_id" : "F",
"value" : 33 "value" : 33
}, },
{ {
"_id" : "M", "_id" : "M",
"value" : 39 "value" : 39
} }
``` ```