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Mastering Development

Grouping data by date in MongoDB and Python

I’m making a standard find query to my MongoDB database, it looks like this: MyData = pd.DataFrame(list(db.MyData.find({‘datetimer’: {‘$gte’: StartTime, ‘$lt’: Endtime}})), columns=[‘price’, ‘amount’, ‘datetime’]) Now i’m trying to do another query, but it’s more complicated and i don’t know how to do it. Here is a sample of my data: {"datetime": "2020-07-08 15:10", "price": 21, […]

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Database Development

The difference between using parallelism “/*+parallel(4)*/” in the subquery or the outer query in terms of performance in Oracle

I have the below query : select /*+parallel(4)*/ —> First Location <Desc_1> Amount, <Desc_2> Amount, <Desc_3> Amount from (select /*+parallel(4)*/ —> Second Location <Column_1>, <Column_2> from <Example_Table> where <Conditions> ) pivot(sum(Column_1) Amount for <Column_2> in (1 as <Desc_1>, 2 as <Desc_2>, 3 as <Desc_3>) ); The point is that <Example_Table> is a very big table […]

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Mastering Development

Executing INSERT from Identity column Output in VB.NET

Using VB.NET and SQL Server: I have a table [Item_List]. When I add a new item from a Windows form, I want to insert the record into the Item_List table, get the ItemID which is an IDENTITY, and use that to insert a corresponding record into the financial tracking [Inventory_Transactions] table. I tested the following […]

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Mastering Development

Dyamic Form In Jquery To Double Check The Value

I face the issue which is when user click + button to have a new row of 4 input field which is name, amount, second name, second amount, how can I use onchange method to check and verify make sure when the user enters the second name and the second amount the value need to […]

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Mastering Development

Unable to set the STOP-LOSS limit order using Binance Python API

I am attempting to create a LONG TRADE that will contain a BUY ORDER and a STOP-LOSS using Python asyncio, ccxt API (which is calling the Binance API for the Binance Crypto Exchange). First I create the BUY ORDER. Afterwards, I am waiting until the order is filled. AFTER it is filled, I am attempting […]

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Bitcoin Cryptocurrency Mastering Development

Bitcoin Cash ABC – Error during sendrawtransaction | Error Code: -26

Tried to make a single signature transfer between two address generated using node in regtest mode. Following was the flow. createrawtransaction -> args: [ UTXO (txid,vout,scriptPubKey,amount), Receiver address, change address] -> Success signrawtransactionwithkey -> args: [Hex-Transaction (output of createrawtransaction), PrivateKey, UTXO (txid,vout,scriptPubKey,amount) ] -> Success sendrawtransaction – args: [Hex- Signed Transaction (output of signrawtransactionwithkey )] […]

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Cryptocurrency Ethereum Mastering Development

Declaration error

I have this contract here and when I deploy i get a declaration error. DeclarationError: Identifier not found or not unique. contract Arbitrageur is Addresses This is my contract: pragma solidity ^0.5.0; import “https://github.com/mrdavey/ez-flashloan/blob/remix/contracts/aave/FlashLoanReceiverBase.sol”; import “https://github.com/mrdavey/ez-flashloan/blob/remix/contracts/aave/ILendingPool.sol”; import “https://github.com/Robsonsjre/FlashloanUsecases/blob/master/contracts/interfaces/IUniswap.sol”; /* * Arbitrageur is a contract to simulate the usage of flashloans * to make profit out […]

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Mastering Development

Coin Change problem with Greedy Approach in Python

I am trying to implement greedy approach in coin change problem, but need to reduce the time complexity because the compiler won’t accept my code, and since I am unable to verify I don’t even know if my code is actually correct or not. The function should return the total number of notes needed to […]

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Mastering Development

Not doing the random pet, just giving the rarest every time. How do I fix it?

I am making a simulator game on roblox and it has a pet system. I revamped how the hatch works, and for some reason it started to glitch out, and always give the same pet, and the pet was always the rarest one. I don’t know what the problem is, here is the script. The […]

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User Help

cross val score returns NAN in sklearn

I am getting nan score from cross_val_score. May I please know how to handle it.. Struggling since a day. from sklearn.model_selection import KFold, cross_val_score from sklearn.model_selection import train_test_split import hyperopt from hyperopt import tpe from hyperopt import STATUS_OK from hyperopt import Trials from hyperopt import hp from hyperopt import fmin from sklearn.linear_model import LogisticRegression df […]