Example 1: FROM table1 LEFT JOIN table2 ON table1.id = table2.id AND table2.flag = TRUE Example 2: FROM table1 LEFT JOIN table2 ON table1.id = table2.id WHERE table2.flag = TRUE Q1: Will both of these return the same number of…
I am creating a database that holds information for tests, test questions, and the questions on each test. I have 3 tables: problem, test, & question_list. problem holds the information for a question, test holds the information for a test,…
I am new to the node.js script I want to calculate the sum of Distance column where the Distance column is available in every table in database before I used looping through tables but it takes so much time to…
With the query below, I generate rows of the week numbers in a year. SET @sql = 52; SELECT WEEKOFYEAR("2023-12-31") INTO @sql; WITH RECURSIVE weeks(i) AS ( SELECT 1 UNION ALL SELECT i + 1 FROM weeks WHERE i +…
A_id B_id L M N 1 1 1 1 0 1 2 4 3 2 1 3 2 2 1 2 4 2 2 1 2 5 3 2 1 2 6 1 1 0 3 7 4 3 1…
I want to dockerize my laravel learning app and have been unable to find simple tutorial that runs without errors. Each one is different and fails so I created my own. Here is how my Dockerfile look like, my first…
Since MySQL version 8.0.17 there is Multi-Valued Indexes for JSON array column, is there also a simple possibility to create Multi-Valued Indexes for comma delimited string column (CHAR, VARCHAR, ...) to increase the performance of FIND_IN_SET function? I know that…
Problem Statement: We will be getting a request of a number (11 digits) and have to efficiently lookup in the database and return a single row (last updated) based on range in which it fits. Also, I have already used…
I am trying to join 2 tables via 2 columns however, the left tables has entity values after them that I want to discard and they always start with (. Example: 1256390(1) or 23452(9), I need to disregard the (1)…
In the nobel quiz, there is a question "Write the code which would show the year when neither a Physics or Chemistry award was given'. My code is as following: SELECT yr FROM nobel WHERE subject NOT IN ('Chemistry','Physics') The…