Import CSV to Update only one column in table

Question

I have a table that looks like this:

products
--------
id, product, sku, department, quantity

There are approximately 800,000 entries in th

Answer 1

Answer from @ike-walker is indeed correct but also remember to double check how your CSV data if formatted. Many times for example CSV files can have string fields enclosed in double quotes ", and lines ending with \r\n if working on Windows.
By default is assumed that no enclosing character is used and line ending is \n. More info and examples here https://mariadb.com/kb/en/importing-data-into-mariadb/

This can be fixed by using additional options for FIELDS and LINES

CREATE TEMPORARY TABLE your_temp_table LIKE your_table;

LOAD DATA INFILE '/tmp/your_file.csv'
INTO TABLE your_temp_table
FIELDS 
   TERMINATED BY ','            
   OPTIONALLY ENCLOSED BY '"'    -- new option
LINES TERMINATED BY '\r\n'       -- new option

(id, product, sku, department, quantity); 

UPDATE your_table
INNER JOIN your_temp_table on your_temp_table.id = your_table.id
SET your_table.quantity = your_temp_table.quantity;

DROP TEMPORARY TABLE your_temp_table;