How to make the two nested loops into one loop for the function? Please add the explanation to the code in your answer. You can add more explanation on strategy guideline to reduce nested loops for other common cases for…
I need to retrieve an object at a specific index from a massive JSON array. The array contains 2,000,000 objects and the file size is around 5GB. I've experimented with various approaches using jq in combination with Python, but performance…
I have 3 billion IPs stored in the following ip_location table. CREATE TABLE ip_location ( id BIGINT AUTO_INCREMENT PRIMARY KEY, ip VARCHAR(15) NOT NULL, country VARCHAR(2), region_1 VARCHAR(255), region_2 VARCHAR(255), latitude DECIMAL(10, 6) NOT NULL, longitude DECIMAL(10, 6) NOT NULL,…
Given an integer n that represents the number of vertices on a graph, and each vertex connect one another with single edge, except for the start vertex and end vertex, we can calculate the minimum distance pair of vertices with…
Javascript Map()s compare object keys by identity, which means Map<[number, number], any> is a bad idea: const map = new Map(); const coordinates = [1, 3]; map.set(coordinates, 0); map.get([1, 3]); # undefined To avoid this, we commonly see keys set…
I'm using a postgresql (15.5) database with the following logic: We have "meters" who measure electrical consumption. We have "computer meters" who are calculation of the measurements of different meters. For exemple "computedMeterA" = "meterA" + "meterB" I have classical…
I am not sure on how to begin optimizing this High Latency SQL query that my platform runs. Other than reducing the datasets, what are some things that I can do? SELECT ctm.* FROM compound_transaction_map ctm JOIN bustransaction_map btm ON…
I'm seeking help regarding full-text searching in MySQL. I have two tables, Article and Keywords. Article: id int, description (varchar(600)) Keyword: id int, value (varchar(50)), article_id int An article can have multiple keywords. For example: id:1, keyword1, article_id: 1 id:2,…
Mysql 8 takes 2 minutes to sort an empty set The following table on 8.0.33 MySQL Community Server CREATE TABLE `eventiAcc` ( `chiave` int NOT NULL AUTO_INCREMENT, `tipo` tinyint NOT NULL, `account` int DEFAULT NULL, `utente` int DEFAULT NULL, `timestp`…
Some background: I'm running the following simple select statement on Postgres 15.3 server with 128GB memory, and contrary to my belief it takes ~6 minutes. The statement in involve two relations, big_table_70m with approximately 70M rows and other_table_50m with a…