I am comparing data from two different databases (one MariaDB and one SQL Server) within my Node project, and am then doing inserts and updates as necessary depending on the comparison results. I have a question about this code that I use to iterate through results in Node, going one at a time and passing in …
Tag: node.js
Matching two values of different types in two SQL databases
I am trying to compare records between two different SQL tables/databases in my Node project and have to do some transformation in order to compare the values. In one database (MariaDB) the value is of type INT, and looks like this: 516542 In the other (SQL Server) database the value I need to match to is of …
SQLite – Sort and get the number in the list
sql.all(`SELECT * FROM users ORDER BY points DESC`).then() How can I sort the list and get the current number on the list? Example: LIST: USERID | POINTS 1 | 20 2 | 100 3 | 67 VAR MYID = 1 Output: …
TypeORM – How to remove last added row?
I’m trying to remove only the last added row. Instead, of the last one, it removes all rows. I was thinking about adding where corresponding to the newest date but I feel it’s not a good approach to solve this problem. Answer Use a subquery to query the last insert row first, then delete this row …
How to not insert two of the same values
I’m using an input to allow user’s to select files from their computer and add it to a list. I’m doing this by using a promise to load the files and creating an array of promises and adding that to my state React JS I’m then mapping through my files array to add those files to a list o…
pagination and filtering on a very large table in postgresql (keyset pagination?)
I have a scientific database with currently 4,300,000 records. It’s a scientific database, and an API is feeding it. In june 2020, I will probably have about 100,000,000 records. This is de layout of the table ‘output’: BTW, this is dummy data. But output is a table with 5 columns: ID, senso…
How to correctly execute this promise based SQL Query?
I’m using MySQL2 to connect my Node.js app with a MySQL Database. Unfortunately trying to perform some promise based prepared statements I just can’t get a proper function setup that either returns successfully after entering the record or to throw an error whenever something goes wrong. Any ideas…
How to get the value of selected option in html using find() in Node.js Express and mongodb
I’m trying to get a specific document in mongodb and I’m using find(). the problem is that it doesn’t give me the result that I’m looking for in the html file (for example: i choose MALE and XL which …
I want this query in Sequelize form
I am getting the output in RAW SQL but I am unable to do with SequelizeJS SELECT * FROM `tbl_a` a LEFT JOIN `tbl_b` b on b.b_uuid = a.a_uuid LEFT JOIN `tbl_c` c on c.c_uuid = a.a_uuid
Incremental invoice number with multiple users
In my app I have users and invoices (amongst other things). I’m not sure what’s the best way to make sure the invoices of every user start with 1 and go up incrementally. For example: User 1 makes …