SQL中的此查询有什么问题

Question

I have the following query:

UPDATE PRODUCT SET FIXEDCOST = 
   (Select PRICE from PRODUCTPROGRAM 
    where productID = PRODUCTID) * .6 
WHERE FAMILY = 'Services'

I need to update the PRODUCT table's FIXEDCOST field with 60% of the value of Price in the PRODUCTPROGRAM table.

The tables are related by productID .

The error says that more than one is returned in the subquery. Any ideas as to how I could fix this? Thanks in advance for any help.

Answer 1

Tamer, you are getting too many results in the "select price from proudctprogram" you need narrow it down or do something like this:

UPDATE PRODUCT A, PRODUCTPROGRAM B   
SET A.FIXEDCOST = B.PRICE * .6 
WHERE A.productID = B.PRODUCTID AND FAMILY ='Services'

Try that and let me know. Marcelo

Answer 2

虽然我不确定语法是否为100％，但您可能想首先尝试引用每个productId设置为PRODUCT.productid和PRODUCTPROGRAM.PRODUCTID的表。

Answer 3

The nested query will return all records from the PRODUCTPROGRAM table, as all records have a PRODUCTID value that is equal to itself.

You have to specify that you want to compare it to the value in the PRODUCT table:

UPDATE PRODUCT
SET FIXEDCOST =
  (Select PRICE from PRODUCTPROGRAM 
  where productID = PRODUCT.PRODUCTID) * .6 
WHERE FAMILY = 'Services'

Answer 4

UPDATE PRODUCT p
    JOIN PRODUCTPROGRAM pp ON pp.productID = p.productID
SET p.FIXEDCOST = pp.PRICE *.6
WHERE p.FAMILY = 'Services'

Answer 5

UPDATE PRODUCT SET FIXEDCOST = 
   (Select TOP 1 PRICE from PRODUCTPROGRAM 
    where productID = PRODUCT.PRODUCTID) * .6 
WHERE FAMILY = 'Services'

Answer 6

Your sub query must be returning more than one value.

Select PRICE from PRODUCTPROGRAM 
where productID = PRODUCTID

Answer 7

Try limiting the subquery or use the unique key in the where clause:

    UPDATE PRODUCT SET FIXEDCOST = 
   (Select PRICE from PRODUCTPROGRAM 
    where productID = PRODUCTID LIMIT 1) * .6 
WHERE FAMILY = 'Services'

Answer 8

Use table aliases to avoid ambiguity? Like UPDATE PRODUCT P SET FIXEDCOST = (SELECT PRICE FROM PRODUCTPROGRAM PP WHERE P.PRODUCTID = PP.PRODUCTID) ...

Answer 9

I suspect the where-statement is wrong. You mean, probably:

where productID = PRODUCT.PRODUCTID