Mysql – Select SUM of columns in unrelated tables in one query
I have these tables which are not related at all: Books Apps Cars Id Views Id Views Id Views ------------ ------------ ------------ 1 3 4 5 11 10 2 4 5 100 13 3 3 3 6 5 15 7…
Postgresql – Bad query plan on different boolean values
I have a table which is used as a job queue. New rows are continuously being inserted in the table and the fetched rows are updated. There are JOINs in the query and Postgres uses Nested Loop join for it.…
Slow loading when data more than 1000 – PHP Versions
The issue is that my laravel application speed's is too slow when the result has over 7k rows. It keep loading for at 23 seconds or more to show the data in a table (i'm using bootstrap model of datatable)…
Android Studio – Unsupported [References to variables aren't supported yet] in android jetpack compose
I want to use reference operator like onClick = ::onClose in below code @Composable fun HeaderIcons(onClose: () -> Unit) { ConstraintLayout( modifier = Modifier .fillMaxWidth() .wrapContentHeight() ) { IconButton( onClick = (::onClose)() ) { Image(imageVector = ImageVector.vectorResource(id = R.drawable.ic_close), contentDescription…
Way to minimize scripts start-up time via persistence? – Debian
Raku start-up times are notoriously huge. On my machine (old one but the most modern I own): time raku -e 'put "Hello, World!"' 495.67 - 567.02 millis (1.53 secs for the 1st time launch) time perl -E 'say "Hello, World!"'…
Is EC2 bandwidth full duplex? – Amazon web services
Amazon documents the network speed of each instance type, giving it a rating like "25 Gbps". As long as certain restrictions are avoided, one can largely expect to achieve this bandwidth between hosts in the same region. My question is,…
MongoDB: inefficient collection / index scan (vs. efficient query using PostgreSQL)
I have a collection with 10M records, with the following schema: { "_id": ObjectId "uid": string } uid is a random string for testing purposes, generated with unique values. There are 2 indexes: {"_id": 1} and {"uid": 1}. The following…
Slow rendering of image in react Native
Image is downloaded , but still rendering very slowly, anyone knows what can be happening? enter image description here here is my code: import React from 'react' import { StyleSheet, Image, Text, View } from 'react-native' import Backgroundimage from '../../../assets/images/backgroundImage.jpg'…
Query optimization on Postgresql
SQL optimization problem, which of the two solutions below is the most efficient? I have the table from the image, I need to group the data by CPF and date and know if the CPFs had at least one login_ok…
Julia seems to be very slow – Debian
I am running code shown in this question. I expected it to run faster second and third time (on first run it takes time to compile the code). However, it seems to be taking same amount of time as the…