将数据插入到select语句包含更多列的表中

Question

Hello i would like to add some rows from my pricelist table to products table. I am trying to fill my products table by testing data. Is possible to make query where i can add random amount of rows to my products table? The main problem is that i have more rows in select statement than in insert statement.

INSERT INTO products(product_name, product_price)
SELECT name_product, price_product, IF(RAND() > 0.2,1,0) AS random
FROM pricelist
HAVING random = 1

Answer 1

Put your condition in the WHERE clause. Your calculated column random does not makes sense since you don't to insert it on the other table.

INSERT INTO products(product_name, product_price)
SELECT name_product, price_product
FROM pricelist
WHERE RAND() > 0.2 = 1

Answer 2

You mean you have more columns in select statement than in insert statement. The column number must match. There are also better ways to choose random rows...

INSERT INTO products(product_name, product_price)
SELECT name_product, price_product
FROM pricelist
ORDER BY RAND()
LIMIT 5