where-clause

来源： https://stackoverflow.com/questions/61807388/why-is-firestore-where-clause-not-working-with-state

来源： https://stackoverflow.com/questions/63281736/flutter-get-json-fixed-data-and-ordered-by-alphabetically

来源： https://stackoverflow.com/questions/63281736/flutter-get-json-fixed-data-and-ordered-by-alphabetically

问题 I am trying to create ( (Where and Where) OR (Where and Where) ) And after a lot of searching I found this $sender = \App\User::where('username','=',$username)->firstOrFail(); $receiver = Auth::user(); $messages = \App\Message::Where(function($query) { $query->where("sender",$sender->id) ->where("receiver",$receiver->id); }) ->orWhere(function($query) { $query->Where("sender",$receiver->id) ->Where("receiver",$sender->id); }) ->get(); But it's showing me that the $sender and the $receiver

问题 I am trying to create ( (Where and Where) OR (Where and Where) ) And after a lot of searching I found this $sender = \App\User::where('username','=',$username)->firstOrFail(); $receiver = Auth::user(); $messages = \App\Message::Where(function($query) { $query->where("sender",$sender->id) ->where("receiver",$receiver->id); }) ->orWhere(function($query) { $query->Where("sender",$receiver->id) ->Where("receiver",$sender->id); }) ->get(); But it's showing me that the $sender and the $receiver

问题 Could anybody tell me what error I might have in my laravel query, basically what I want is to list the records of a table whose id is not related in another table. I did it in Mysql with this query: SELECT * FROM item WHERE NOT EXISTS (SELECT null FROM qualifications WHERE grades.item_id = item.id AND qualifications.user_id = 2); but now I need to do this same query in laravel, I tried it this way: codigo and what I get is this syntax error that I do not know how to solve anymore: error I am

问题 I have looked through the other answers for Operand errors and none seem to fit this example. The mathematics/equation works, either coding in X values or importing from the DataFrame. Using the same equation in an np.where expression causes the operand error. import csv import pandas as pd from pandas import DataFrame import numpy as np data= pd.read_csv('miniDF.csv') df=pd.DataFrame(data, columns=['X','Z']) df['y']=df['Z']*0.01 df['y']=(14.6413819224756*(df['X']**0.5)+64.4092780704338*(np

问题 I have looked through the other answers for Operand errors and none seem to fit this example. The mathematics/equation works, either coding in X values or importing from the DataFrame. Using the same equation in an np.where expression causes the operand error. import csv import pandas as pd from pandas import DataFrame import numpy as np data= pd.read_csv('miniDF.csv') df=pd.DataFrame(data, columns=['X','Z']) df['y']=df['Z']*0.01 df['y']=(14.6413819224756*(df['X']**0.5)+64.4092780704338*(np

问题 I have looked through the other answers for Operand errors and none seem to fit this example. The mathematics/equation works, either coding in X values or importing from the DataFrame. Using the same equation in an np.where expression causes the operand error. import csv import pandas as pd from pandas import DataFrame import numpy as np data= pd.read_csv('miniDF.csv') df=pd.DataFrame(data, columns=['X','Z']) df['y']=df['Z']*0.01 df['y']=(14.6413819224756*(df['X']**0.5)+64.4092780704338*(np

问题 I have one table where date column is having data in below format: "7/25/2014 12:14:27 AM'. I need to fetch this date by putting in the where clause. can anyone suggest how can i do this? 回答1: Dates (stored in tables) are represented by 7 bytes - they do not have any format associated with them. If they are formatted as a string then that is the client program which you are using to access the database applying its own formatting to the date (which you can usually set via the preferences in