indexing

问题 How we can get value from a cell in google spreadsheet? I have row and column index from ROW() and COLUMN() - 1. In other words what is the other way to do "=B1" i have row as 1 and column as 2. Any suggestion, a single spreadsheet query. other than add function to spreadsheet. 回答1: Say the row number is in A1, and the column number is in A2, any of these should work: =OFFSET(A1;A1-1;A2-1) =INDIRECT("R"&A1&"C"&A2) =INDEX(A1:400000;A1;A2) 回答2: To do so use indirect() as such: =indirect("'PAGE

问题 I am importing a CSV into a pandas dataframe. When I am do this, I am setting the index column to 0, which is the Index listed (0 to 10). I am getting the error Key Error: the label [1] is not in the [index]. I've checked the data multiple times to make sure that the first column is the list of numbers. Any hints on how I can fix this? from __future__ import division import pandas as pd import random import math #USER VARIABLES #GAME VARIABLES Passengers = 500 data = pd.read_csv("Problem2

问题 I'm looking for an advice about which indexing strategy to use in MongoDb 3.4. Let's suppose we have a people collection of documents with the following shape: { _id: 10, name: "Bob", age: 32, profession: "Hacker" } Let's imagine that a web api to query the collection is exposed and that the only possibile filters are by name or by age . A sample call to the api will be something like: http://myAwesomeWebSite/people?name="Bob"&age=25 Such a call will be translated in the following query: db

问题 I'm looking for an advice about which indexing strategy to use in MongoDb 3.4. Let's suppose we have a people collection of documents with the following shape: { _id: 10, name: "Bob", age: 32, profession: "Hacker" } Let's imagine that a web api to query the collection is exposed and that the only possibile filters are by name or by age . A sample call to the api will be something like: http://myAwesomeWebSite/people?name="Bob"&age=25 Such a call will be translated in the following query: db

问题 I currently have the following query prepared: select sum(amount) as total from incomes where (YEAR(date) = '2019' and MONTH(date) = '07') and incomes.deleted_at is null when reviewing it a bit, notice that it takes too long to have a lot of data in the table, since it goes through all this. I do not know much about optimizing queries, but I want to start documenting and researching for this case, reading a little note that although it is possible to create an index for a date type field,

问题 While seeing the explanation for a Java programming exercise online, I came upon the following piece of code: int[] count = new int[128]; int length = 0; for(char c: s.toCharArray()){ if(++count[c] == 2){ length += 2; count[c] = 0; } } I understand what the code does but I don't know how it can access an array element using a char index (i.e.count[c], where c is a char). I thought indexes could only be integers? 回答1: A char (16 bit) is an int (32 bit), not vice versa. This is an implicit

问题 In Neo4j, if I delete an indexed node do I have to remove that node from the index first or will the index be updated automatically? Here is a small (untested) example: val index = graphDb.index() val someIdx = index.forNodes("someIdx") val someNode = graphDb.createNode() someIdx.add(someNode, "key", "value") And then: //remove from someIdx??? someNode.delete() 回答1: When you delete a node, you have to remove the index first. If you want to remove all mentions of a node from the index, see

问题 I created a table in MySQL: CREATE TABLE index_test( moment DATETIME, one_more_attr VARCHAR(10) ); ALTER TABLE index_test ADD INDEX(moment); There're two query strings: A: `SELECT * FROM index_test WHERE moment LIKE '2015-06-08%'` B: `SELECT * FROM index_test WHERE moment BETWEEN '2015:06:08 00:00:00' AND '2015:06:08 23:00:00'` Using the 'explain' statement, I found that statement B is using the index, but A not. And when I make 'moment' varchar, they both use the index. Is anybody can tell

问题 I'm trying to optimize a set of stored procs which are going against many tables including this view. The view is as such: We have TBL_A (id, hist_date, hist_type, other_columns) with two types of rows: hist_type 'O' vs. hist_type 'N'. The view self joins table A to itself and transposes the N rows against the corresponding O rows. If no N row exists for the O row, the O row values are repeated. Like so: CREATE OR REPLACE FORCE VIEW V_A (id, hist_date, hist_type, other_columns_o, other

问题 I am creating a list .. the elements of the list are drawn from sqlite database .. I populate the list using ArrayList and ArrayAdapter ...upon clicking the items on the list I want to be able to fire an intent containing info about the item clicked ... info like the index number of the item .. using the method: onItemClick(AdapterView av, View v, int index, long arg) I do get index of the item clicked . however it is of the list currently displayed . the problem comes when I do