lookup

问题 This question already has answers here : Multiple join conditions using the $lookup operator (4 answers) Closed 2 years ago . I'd like to "join" 3 Collections in MongoDB by using mongochef. The collections are "Order", "Employee" and "City". I tried to use temp collections, but it is not effective. Now I am using var = a for the first "join". If I 'd like to show "a", there are displayed 20 results only. Do you have an idea or another solution? var a = db.Order.aggregate([ { $lookup: { from:

问题 Hi I have a lookup type that stores strings and ints. static Lookup<string, int> lookup; lookup = (Lookup<string, int>)list.ToLookup(i => i.IP, i => i.Number); But now I need to sort this lookup by the values (number), and get the top 10 keys with their values. How is this possible? 回答1: I'm not sure why you are casting a Lookup<string, int> to a Lookup<string, string> , but the general answer you want is: var list = new List<Test> { new Test { IP = "A", Number = 1 }, new Test { IP = "A",

问题 Hi I have a lookup type that stores strings and ints. static Lookup<string, int> lookup; lookup = (Lookup<string, int>)list.ToLookup(i => i.IP, i => i.Number); But now I need to sort this lookup by the values (number), and get the top 10 keys with their values. How is this possible? 回答1: I'm not sure why you are casting a Lookup<string, int> to a Lookup<string, string> , but the general answer you want is: var list = new List<Test> { new Test { IP = "A", Number = 1 }, new Test { IP = "A",

问题 I am VERY close to getting what I want out of this query... but I only want SOME of the fields returned and right now it is returning all of them NOTE : This is a refinement : I am now asking how to return only certain fields , while my similar question asks how to return the data between a start and end date In addition, can somebody please please provide an answer using the MongoDB Playground with MY data sets so I can try it out... I can't quite figure out how to "name" the data sets so

问题 I would like to get all Notifications between a start and end date that are related to a Register when I pass in a userId. Register Schema const mongoose = require('mongoose'); const Schema = mongoose.Schema; const RegisterSchema = new Schema({ userId: {type: Schema.Types.ObjectId, required: true}, accessToken: {type:String, required: true, default: null}, }) module.exports = Register = mongoose.model( 'register', RegisterSchema) Here is some register data [ { "_id": "5eac9e815fc57b07f5d0d29f

问题 I looked on Django's documentation and Googled every varation of the phrase but I cannot find any documentation that exactly describes the behaviour of lookuptypes. app.objects.filter(column__lookuptype=criteria) I have found documentation on which lookuptypes I can use but not what they do or how to use them. For example, I have no bloody clue what __gte does, but I cannot find good documentation on what it does either. Is there documentation that I overlooked? Any pointers in the right

问题 I have a personals & holiday table. I want to transfer data to another table. But a personal (emre) has two holiday date. Lookup function taking only first data. 回答1: Can you try it please? You should enter Ctrl + Shift + Enter to activate the array formula. =INDEX(Sayfa1!$B$2:$B$6,MATCH(TRUE,EXACT(A2,Sayfa1!$A$2:$A$6),0)) Useful Link: https://www.extendoffice.com/documents/excel/2699-excel-vlookup-find-first-2nd-match.html If it is too complicated for you research xlookup. https://support

问题 I am working on nestjs and I have two collections one is order and the second is payment. Now I need to retrieve one document from the collection order and save it into payment collection which is working properly but the issue is when I am trying to save the second document into payment collection then my first document is overwritten. In other words, the first document has vanished after submitting the second document. I want to save every document in payment collection which i retrieved

问题 Trying to LEFT JOIN a table with partial string match. I've tried changing the wildcard in the LIKE condition, but it still only searches for the full string. Any suggestions? I've got a list of product abbreviations stored in a table. Would be easier to manage this list with partial matching versus having to spell out every product. Thanks in advance! CREATE TABLE `order` ( order_id INT (11) NOT NULL, shipping_firstname VARCHAR (128) NOT NULL, shipping_lastname VARCHAR (128) NOT NULL );

问题 This is about my Result/Target workbook, I have 2 sheets "Open" and "sheet2", these codes apply vlookup formula from row 2 to end of range in last available empty column of the sheet "Open". The entire first row in the sheet "Open has dates, is it possible to apply formula to the column of respective date which matches date in Sheet2 cell "A1" instead of last empty column?? Sub GET_BHAV() Dim VlookUpVal As Variant Dim OpenWs As Worksheet, HighWs As Worksheet, bhavWs As Worksheet Dim