INSERT INTO with SubQuery MySQL

Question

I have this Statement:

INSERT INTO qa_costpriceslog (item_code, invoice_code, item_costprice)
    VALUES (1, 2, (SELECT item_costprice FROM qa_items WHERE it         


        

Answer 1

Use numeric literals with aliases inside a SELECT statement. No () are necessary around the SELECT component.

INSERT INTO qa_costpriceslog (item_code, invoice_code, item_costprice)
  SELECT
    /* Literal number values with column aliases */
    1 AS item_code,
    2 AS invoice_code,
    item_costprice
  FROM qa_items 
  WHERE item_code = 1;

Note that in context of an INSERT INTO...SELECT, the aliases are not actually necessary and you can just SELECT 1, 2, item_costprice, but in a normal SELECT you'll need the aliases to access the columns returned.