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

I would load the update data into a seperate table UPDATE_TABLE and perform an update within MySQL using:

UPDATE PRODUCTS P SET P.QUANTITY=(
    SELECT UPDATE_QUANTITY
    FROM UPDATE_TABLE
    WHERE UPDATE_PRODUCT=P.PRODUCT
)

I dont have a MySQL at hand right now, so I can check the syntax perfectly, it might be you need to add a LIMIT 0,1 to the inner SELECT.