SQLServer 子查询返回多于1个值。当子查询跟随 = ，! 时，这是不允许的！= ，< ，< = ，> ，> =

我运行以下查询:

SELECT
orderdetails.sku,
orderdetails.mf_item_number,
orderdetails.qty,
orderdetails.price,
supplier.supplierid,
supplier.suppliername,
supplier.dropshipfees,
cost = (SELECT supplier_item.price
FROM   supplier_item,
orderdetails,
supplier
WHERE  supplier_item.sku = orderdetails.sku
AND supplier_item.supplierid = supplier.supplierid)
FROM   orderdetails,
supplier,
group_master
WHERE  invoiceid = '339740'
AND orderdetails.mfr_id = supplier.supplierid
AND group_master.sku = orderdetails.sku

我得到以下错误:

Msg 512,16层，1号州2号线 子查询返回多于1个值。当子查询跟随 = ，! 时，这是不允许的！= ，< ，< = ，> ，> = 或当子查询用作表达式时。

有什么想法吗？

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小开

The select statement in the cost part of your select is returning more than one value. You need to add more where clauses, or use an aggregation.

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cost = Select Supplier_Item.Price from Supplier_Item,orderdetails,Supplier
where Supplier_Item.SKU=OrderDetails.Sku and
Supplier_Item.SupplierId=Supplier.SupplierID

This subquery returns multiple values, SQL is complaining because it can't assign multiple values to cost in a single record.

Some ideas:

  1. Fix the data such that the existing subquery returns only 1 record
  2. Fix the subquery such that it only returns one record
  3. Add a top 1 and order by to the subquery (nasty solution that DBAs hate - but it "works")
  4. Use a user defined function to concatenate the results of the subquery into a single string
小开

The error implies that this subquery is returning more than 1 row:

(Select Supplier_Item.Price from Supplier_Item,orderdetails,Supplier where Supplier_Item.SKU=OrderDetails.Sku and Supplier_Item.SupplierId=Supplier.SupplierID )

You probably don't want to include the orderdetails and supplier tables in the subquery, because you want to reference the values selected from those tables in the outer query. So I think you want the subquery to be simply:

(Select Supplier_Item.Price from Supplier_Item where Supplier_Item.SKU=OrderDetails.Sku and Supplier_Item.SupplierId=Supplier.SupplierID )

I suggest you read up on correlated vs. non-correlated subqueries.

小开

The fix is to stop using correlated subqueries and use joins instead. Correlated subqueries are essentially cursors as they cause the query to run row-by-row and should be avoided.

You may need a derived table in the join in order to get the value you want in the field if you want only one record to match, if you need both values then the ordinary join will do that but you will get multiple records for the same id in the results set. If you only want one, you need to decide which one and do that in the code, you could use a top 1 with an order by, you could use max(), you could use min(), etc, depending on what your real requirement for the data is.

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As others have suggested, the best way to do this is to use a join instead of variable assignment. Re-writing your query to use a join (and using the explicit join syntax instead of the implicit join, which was also suggested--and is the best practice), you would get something like this:

select
OrderDetails.Sku,
OrderDetails.mf_item_number,
OrderDetails.Qty,
OrderDetails.Price,
Supplier.SupplierId,
Supplier.SupplierName,
Supplier.DropShipFees,
Supplier_Item.Price as cost
from
OrderDetails
join Supplier on OrderDetails.Mfr_ID = Supplier.SupplierId
join Group_Master on Group_Master.Sku = OrderDetails.Sku
join Supplier_Item on
Supplier_Item.SKU=OrderDetails.Sku and Supplier_Item.SupplierId=Supplier.SupplierID
where
invoiceid='339740'
小开
最佳答案

Try this:

SELECT
od.Sku,
od.mf_item_number,
od.Qty,
od.Price,
s.SupplierId,
s.SupplierName,
s.DropShipFees,
si.Price as cost
FROM
OrderDetails od
INNER JOIN Supplier s on s.SupplierId = od.Mfr_ID
INNER JOIN Group_Master gm on gm.Sku = od.Sku
INNER JOIN Supplier_Item si on si.SKU = od.Sku and si.SupplierId = s.SupplierID
WHERE
od.invoiceid = '339740'

This will return multiple rows that are identical except for the cost column. Look at the different cost values that are returned and figure out what is causing the different values. Then ask somebody which cost value they want, and add the criteria to the query that will select that cost.

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Either your data is bad, or it's not structured the way you think it is. Possibly both.

To prove/disprove this hypothesis, run this query:

SELECT * from
(
SELECT count(*) as c, Supplier_Item.SKU
FROM Supplier_Item
INNER JOIN orderdetails
ON Supplier_Item.sku = orderdetails.sku
INNER JOIN Supplier
ON Supplier_item.supplierID = Supplier.SupplierID
GROUP BY Supplier_Item.SKU
) x
WHERE c > 1
ORDER BY c DESC

If this returns just a few rows, then your data is bad. If it returns lots of rows, then your data is not structured the way you think it is. (If it returns zero rows, I'm wrong.)

I'm guessing that you have orders containing the same SKU multiple times (two separate line items, both ordering the same SKU).

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Check to see if there are any triggers on the table you are trying to execute queries against. They can sometimes throw this error as they are trying to run the update/select/insert trigger that is on the table.

You can modify your query to disable then enable the trigger if the trigger DOES NOT need to be executed for whatever query you are trying to run.

ALTER TABLE your_table DISABLE TRIGGER [the_trigger_name]


UPDATE    your_table
SET     Gender = 'Female'
WHERE     (Gender = 'Male')


ALTER TABLE your_table ENABLE TRIGGER [the_trigger_name]
小开 
SELECT COLUMN
FROM TABLE
WHERE columns_name
IN ( SELECT COLUMN FROM TABLE WHERE columns_name = 'value');

note: when we are using sub-query we must focus on these points:

  1. if our sub query returns 1 value in this case we need to use (=,!=,<>,<,>....)
  2. else (more than one value), in this case we need to use (in, any, all, some )
小开

I had the same problem , I used in instead of = , from the Northwind database example :

Query is : Find the Companies that placed orders in 1997

Try this : 

SELECT CompanyName
FROM Customers
WHERE CustomerID IN (
SELECT CustomerID
FROM Orders
WHERE YEAR(OrderDate) = '1997'
);

Instead of that : 

SELECT CompanyName
FROM Customers
WHERE CustomerID =
(
SELECT CustomerID
FROM Orders
WHERE YEAR(OrderDate) = '1997'
);
小开

Even after 9 years of the original post, this helped me.

If you are receiving these types of errors without any clue, there should be a trigger, function related to the table, and obviously it should end up with an SP, or function with selecting/filtering data NOT USING Primary Unique column. If you are searching/filtering using the Primary Unique column there won't be any multiple results. Especially when you are assigning value for a declared variable. The SP never gives you en error but only an runtime error.

 "System.Data.SqlClient.SqlException (0x80131904): Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated."

In my case obviously there was no clue, but only this error message. There was a trigger connected to the table and the table updating by the trigger also had another trigger likewise it ended up with two triggers and in the end with an SP. The SP was having a select clause which was resulting in multiple rows.

SET @Variable1 =(
SELECT column_gonna_asign
FROM dbo.your_db
WHERE Non_primary_non_unique_key= @Variable2

If this returns multiple rows, you are in trouble.


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