staff:courses:no_sql_introduction:mongo_query_across_levels
Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
|
staff:courses:no_sql_introduction:mongo_query_across_levels [2016/11/28 12:09] mark created |
staff:courses:no_sql_introduction:mongo_query_across_levels [2022/12/10 09:08] (current) |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| Задача: в БД с данными о видах и конкретных особях животных найти тех, кто питается одинаковым кормом. Исходные данные: | Задача: в БД с данными о видах и конкретных особях животных найти тех, кто питается одинаковым кормом. Исходные данные: | ||
| - | //db.animals.insert({animal_type:"l1", individuals: [ {name: "", text: "", feed: [1, 2] }, {name: "", text: "", feed: [3,4] }]}) | + | <code javascript>db.animals.insert({animal_type:"l1", individuals: [ {name: "", text: "", feed: [1, 2] }, {name: "", text: "", feed: [3,4] }]}) |
| db.animals.insert({animal_type:"l2", individuals: [ {name: "", text: "", feed: [1, 2] }, {name: "", text: "", feed: [2] }]}) | db.animals.insert({animal_type:"l2", individuals: [ {name: "", text: "", feed: [1, 2] }, {name: "", text: "", feed: [2] }]}) | ||
| - | db.animals.insert({animal_type:"l3", individuals: [ {name: "", text: "", feed: [1, 2] }, {name: "", text: "", feed: [3] }]})// | + | db.animals.insert({animal_type:"l3", individuals: [ {name: "", text: "", feed: [1, 2] }, {name: "", text: "", feed: [3] }]})</code> |
| Решение: | Решение: | ||
| Line 11: | Line 11: | ||
| Вывод: | Вывод: | ||
| - | //{ "_id" : ObjectId("5834832075ec6ecba9a62c11"), "animal_type" : "l1", "individuals" : [ { "name" : "", "text" : "", "feed" : [ 1, 2 ] }, { "name" : "", "text" : "", "feed" : [ 3, 4 ] } ] } | + | <code javascript> |
| - | { "_id" : ObjectId("5834833975ec6ecba9a62c13"), "animal_type" : "l3", "individuals" : [ { "name" : "", "text" : "", "feed" : [ 1, 2 ] }, { "name" : "", "text" : "", "feed" : [ 3 ] } ] }// | + | { |
| + | "_id" : ObjectId("5834832075ec6ecba9a62c11"), | ||
| + | "animal_type" : "l1", | ||
| + | "individuals" : [ | ||
| + | { "name" : "", "text" : "", "feed" : [ 1, 2 ] }, | ||
| + | { "name" : "", "text" : "", "feed" : [ 3, 4 ] } | ||
| + | ] | ||
| + | } | ||
| + | { | ||
| + | "_id" : ObjectId("5834833975ec6ecba9a62c13"), | ||
| + | "animal_type" : "l3", | ||
| + | "individuals" : [ | ||
| + | { "name" : "", "text" : "", "feed" : [ 1, 2 ] }, | ||
| + | { "name" : "", "text" : "", "feed" : [ 3 ] } | ||
| + | ] | ||
| + | } | ||
| + | </code> | ||
staff/courses/no_sql_introduction/mongo_query_across_levels.1480334962.txt.gz · Last modified: 2022/12/10 09:08 (external edit)
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
