db.inventory.aggregate( [ { $lookup: { from: "order", localField: "_id", foreignField: "item_id", as: "inventory_docs" } } ] ) The $lookup is joining based on the item_id field, which is indexed. If 100,000 documents pass through this $lookup, it increased the query…
I have 3 mysql tables. All the tables will have many entries of the same person. For desire output need help Table_1 Table_2 Table_3 id name bill id name total id name total 1 John 100 1 John 20 1…
I want to add or insert thousands commas in between digits of a number as long as I input digits like some calculators (see the image). For example, when I begin inputting the digits 793, the code inserts automatically a…
I have got 3 tables. Orders Clients Referrals ----- ----- ----- id id id total_price name name receiver_client_id status client_id While adding order, sometimes the receiver is CLIENT, sometimes REFERRAL, so receiver_client_id can have both client_id or referral_id. Referrals are…
I am trying some practice SQL problems and I am having trouble with one question. The question wants me to return a table that has [Test ID, Test Name, and Test Difficulty]. The issue is that I have to create…
I trying to fetch data from two related tables using a foreign key and keep the data as separate records / objects. The best solution I have found so far is using JOINs with column prefixing to differentiate between the…
I have some calculation and want to do this in the query. There is parent and children tables with one-to-many relationship: CREATE TABLE `parent` ( `id` int NOT NULL AUTO_INCREMENT, `value` decimal(10,2) DEFAULT NULL, PRIMARY KEY (`id`) ); CREATE TABLE…
I am using the Sakila Database for practice. I am calculating - Sales by Store. It provides a list of total sales, broken down by store. It incorporates data from the city, country, payment, rental, inventory, store, address, and staff…
I'm using mysql 8, I need to create a calculated field named status in the supplier table. When creating this field, it shows an error. where am i going wrong? Could it be a syntax error? create table tbqualificacao( idqualificacao…
I have the two tables assets and transactions in my database, whereby transactions are connected to assets by the columns transactions.from_id and transactions.to_id: assets: id title 1 a1 2 a2 3 a3 transactions: id title from_id to_id 1 t1 1…