If I have 2 tables, each have a product_stat
DECIMAL and product_id
INT column
I want to run a query that will append the product_stat from TableA to TableB on product_id. Then truncate TableA
Basically I am collecting data and temporarily storing it in TableA, and once a day I want to move the data to TableB. So that TableB only has the data shifted once a day.
The quich solution is to use a subquery
UPDATE tableB SET product_stat = (
SELECT product_stat FROM tableA
WHERE tableB.product_id = tableA.product_id
)
But you can use UPDATE in conjunction with JOIN, which will have a better performance
UPDATE tableB
INNER JOIN tableA ON tableB.product_id = tableA.product_id
SET tableB.product_stat = tableA.product_stat
UPDATE Authors AS A, Books AS B SET AuthorLastName = 'Wats' WHERE B.AuthID = A.AuthID AND AND ArticleTitle='Something';
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.