SQLite function to format numbers with leading zeroes?

Question

I’ve got an SQLite database that will need to contain products. Those products have a fixed-format composite product number, consisting of category, group and product numbe

Answer 1

Since 3.8.3 (2014) You can use printf as:

SELECT printf('%04d', product_number) AS product_number FROM table;

Change the 4 to however many digits you need. This would return 0001 for product_number 1.