I'm working on a project that uses a sort of roomCode host/join system to function. It's written in js/html/css with a php server. I've had success so far with using PHP and MySQL on this project to insert stuff into…
I want to prevent simultaneous withdrawal of account balance. For example, don't allow it when the balance of the user's account is 500 dollars. Two concurrent requests that withdraw $300 will change the user balance to -$100 users table :…
creating a resultant DataFrame that combines information from both sources while filling missing values in 'Product Strings' with corresponding values from 'df2'. import pandas as pd # DataFrame 1 data1 = {'Company ID': [1, 2, 3], 'Product ID': ['D1', 'D2',…
I am using Union All for two select query. Both side the query is different I have to find the records from both table and show. I have tried below query but I am getting error #1064 - You have…
When connecting to mysql database mysql 5.7 import ( "database/sql" _ "github.com/go-sql-driver/mysql" ) db, err := sql.Open("mysql", "root:xxx@tcp(localhost:3306)/mydb") err = db.Ping() Error Error 1130: Host '127.0.0.1' is not allowed to connect to this MySQL server But when connecting via command…
I using Spring Boot to build Restful API. Anything work so good. But, when i try create new Discuss by POST request in Postman. I've received error: "Failed to convert property value of type 'java.lang.String' to required type 'com.nd2.assignwork.entity.UserAccountEntity' for…
I am a new sql learner. I am stuck with the following problem: Suppose I have the following table : ID detail A1 11 A1 12 A1 null A1 0 A2 11 A2 13 Now I want to create a…
I am kind of a noob when it comes to coding. I can do some basic PHP and HTML - and that's how far it goes. I have a wordpress site sind 2009 and in the time being it created…
My question quiet long, cuz there a lot of thing I need: I've built a Next.js App with Prisma, and created local mysql database with Xampp. Currently dev mode on my machine is working perfectly, but this is not why…
Trying to debug a slow query: SELECT IFNULL(SUM(bt.transactionQuantity * bpd.unitPrice), 0) FROM batchTransaction bt LEFT JOIN batch b ON b.id = bt.batchId LEFT JOIN batchPricingDetails bpd ON bpd.id = b.batchPricingDetailsId WHERE (bt.productId, bt.dateCreated) IN ( SELECT productId, MAX(dateCreated) FROM batchTransaction…