I have a problem about my query and i dont know what to do about it.Here is my query.and error i take.
select prd.product_id,prd.prd_name ,prd.prd_longname ,prd.prd_brand ,prd.prd_picture ,prd.market_comment ,prd.categ ,prd.status_id ,prd.status ,prd.active_stock ,prd.slot_date ,prd.currency ,prd.selling_price ,prd.old_price ,prd.type_of_sell ,prd.catalog_id ,prd.catalog_name ,prd.demo ,prd.demo_id,
(select coalesce(count(prd_attribute_id),0) from PRD_ATTRIBUTE where status_id = 1 and product_id = prd.product_id and batch_code <> '0000') as ATTR_CNT ,
(select prd_attribute_id from PRD_ATTRIBUTE where product_id = prd.product_id and batch_code = '0000' and status_id = 1),
(select categ_url from DBNAME.PRD_CATEGORY
where parameter_id = prd.categ_id)||'/'|| (select prd_url from DBNAME.PRODUCT_URL where product_id = prd.product_id) as CATEG_URL
from TEMP_WEB_PRD prd
order by slotdate desc
fetch first 12 rows only
Error:
[IBM][CLI Driver][DB2/AIX64] SQL0811N The result of a scalar fullselect, SELECT INTO statement, or VALUES INTO statement is more than one row. SQLSTATE=21000
The error message is pretty self-explanatory. One of your sub-selects is returning more than one row back, and the database doesn't know how to handle that. I'm guessing your database is DB2 on Linux/Unix/Windows, based on the error message, so here's the Info Center article on your error.
Yes in short it's due to you are using "=" but duplicate rows returned from sub-select statement.
Suppose you have a simple table:
create table T1 (ID int not null primary key, FID int);
The following statement may return SQL0811N if FID column references the same ID values multiple times.
db2 "select id from T1 where ID=(select fid from T1)"
ID
SQL0811N The result of a scalar fullselect, SELECT INTO statement, or VALUES
INTO statement is more than one row. SQLSTATE=21000
The following statement will run successfully:
db2 "select id from T1 where ID IN (select fid from T1)"
Maybe one of your tables has duplicate data, make sure you've checked it. I have the same problem too, it is caused by duplicate rows and it makes subquery return more than one row.
Related
Using postgres
The following SQL creates TestsTodo, having all the informations about a table tests.
It also have a TestsTodoIds, having only the ids of TestsTodo
Then, i want to update all the rows of a table "test_results", with all the ids in TestsTodoIds. I can do it by setting "WHERE test_id IN (select id from TestsTodo)" But i cant do it with "WHERE test_id IN TestsTodoIds", which is basically the same, i don't understand why.
WITH
TestsTodo AS
(
-- Selecting from table tests
),
TestsTodoIds AS
(
SELECT id FROM TestsTodo -- This returns all the. ids from TestsTodo
)
--UPDATE test_results
--SET status = 'FOUND_IN_DB'
--WHERE test_id IN (SELECT id FROM TestsTodo)
--RETURNING *
-- This works
UPDATE test_results
SET status = 'FOUND_IN_DB'
WHERE test_id IN TestsTodoIds
RETURNING * -- This does not
Error: ERROR: syntax error at or near "TestsTodoIds"
LINE 31: WHERE test_id IN TestsTodoIds
^
Your CTE called TestsTodoIds is a virtual table with one column. It isn't a set of values, and IN needs a set of values. You could use
WHERE test_id IN (SELECT id FROM TestsTodoIds)
and your query would function correctly.
That CTE is, in my opinion, unnecessary. The WHERE clause I suggested will perform exactly the same as
WHERE test_id IN (SELECT id FROM TestsTodo)
and you'll have less complexity to cope with when reading and reasoning about the query.
I have the following query which inserts data into one table after selecting it from another.
The problem is that the data types do not match for one of the columns. I have simplified the query below.
INSERT INTO tbl.LogTable (
[SelPartNo], -- This does not match, see below
)
SELECT TOP 1
IF([SelPartNo] = 'False', NULL, [SelPartNo],
FROM tbl.MyTable
WHERE ID = '20358'
ORDER BY CreateDate DESC
The first SelPartNo is an int and the second is a VarChar. In most instances the SelPartNo for the second one (tbl.MyTable) is NULL or an integer, which I don't think will cause a problem. But in some cases the value is "False", which needs to return NULL.
I have tried an IF statement but I am doing something wrong because it's giving a syntax error and I am unsure if this is the correct approach.
Your code is syntactically incorect...
Try it with
NULLIF([SelPartNo],'False')
This function returns NULL if the two expressions are equal.
Details: https://msdn.microsoft.com/en-us/library/ms177562.aspx
I don't think IF is a function, at least not one which you can use in a SELECT statement. But CASE WHEN ... END is your friend:
INSERT INTO tbl.LogTable (
[SelPartNo]
)
SELECT TOP 1
CASE WHEN [SelPartNo] = 'False' THEN NULL ELSE [SelPartNo] END
FROM tbl.MyTable
WHERE ID = '20358'
ORDER BY CreateDate DESC
I m struggling to update one column for a table with a sub query. I have a table where currently one of the values is null.
Currently I have:
UPDATE DW1_PURCHASES SET DW1_PURCHASES.TOTAL_AMT =
(
SELECT DW1_PURCHASES.QUANTITY * DW1_PRODUCTS.PRICE
FROM DW1_PURCHASES, DW1_PRODUCTS
WHERE DW1_PURCHASES.PRODUCT_ID = DW1_PRODUCTS.PRODUCT_ID
)
Although subquery returns data which I need to insert I get a error of single row subquery returns multiple rows.How do I basically shift subquery result to the table?
Thanks.
You don't have to JOINthe update table inside the sub-query. Just correlate the sub-query with update table
UPDATE DW1_PURCHASES
SET DW1_PURCHASES.TOTAL_AMT =
(
SELECT DW1_PURCHASES.QUANTITY * DW1_PRODUCTS.PRICE
FROM DW1_PRODUCTS
WHERE DW1_PURCHASES.PRODUCT_ID = DW1_PRODUCTS.PRODUCT_ID
)
Note : If your DW1_PRODUCTS table has duplicated PRODUCT_ID then even now there is a possibility to get the same error
Please see the table structure below:
CREATE TABLE Person (id int not null, PID INT NOT NULL, Name VARCHAR(50))
CREATE TABLE [Order] (OID INT NOT NULL, PID INT NOT NULL)
INSERT INTO Person VALUES (1,1,'Ian')
INSERT INTO Person VALUES (2,2,'Maria')
INSERT INTO [Order] values (1,1)
Why does the following query return two results:
select * from Person WHERE id IN (SELECT ID FROM [Order])
ID does not exist in Order. Why does the query above produce results? I would expect it to error because I'd does not exist in order.
This behavior, while unintuitive, is very well defined in Microsoft's Knowledge Base:
KB #298674 : PRB: Subquery Resolves Names of Column to Outer Tables
From that article:
To illustrate the behavior, use the following two table structures and query:
CREATE TABLE X1 (ColA INT, ColB INT)
CREATE TABLE X2 (ColC INT, ColD INT)
SELECT ColA FROM X1 WHERE ColA IN (Select ColB FROM X2)
The query returns a result where the column ColB is considered from table X1.
By qualifying the column name, the error message occurs as illustrated by the following query:
SELECT ColA FROM X1 WHERE ColA in (Select X2.ColB FROM X2)
Server: Msg 207, Level 16, State 3, Line 1
Invalid column name 'ColB'.
Folks have been complaining about this issue for years, but Microsoft isn't going to fix it. It is, after all, complying with the standard, which essentially states:
If you don't find column x in the current scope, traverse to the next outer scope, and so on, until you find a reference.
More information in the following Connect "bugs" along with multiple official confirmations that this behavior is by design and is not going to change (so you'll have to change yours - i.e. always use aliases):
Connect #338468 : CTE Column Name resolution in Sub Query is not validated
Connect #735178 : T-SQL subquery not working in some cases when IN operator used
Connect #302281 : Non-existent column causes subquery to be ignored
Connect #772612 : Alias error not being reported when within an IN operator
Connect #265772 : Bug using sub select
In your case, this "error" will probably be much less likely to occur if you use more meaningful names than ID, OID and PID. Does Order.PID point to Person.id or Person.PID? Design your tables so that people can figure out the relationships without having to ask you. A PersonID should always be a PersonID, no matter where in the schema it is; same with an OrderID. Saving a few characters of typing is not a good price to pay for a completely ambiguous schema.
You could write an EXISTS clause instead:
... FROM dbo.Person AS p WHERE EXISTS
(
SELECT 1 FROM dbo.[Order] AS o
WHERE o.PID = p.id -- or is it PID? See why it pays to be explicit?
);
The problem here is that you're not using Table.Column notation in your subquery, table Order doesn't have column ID and ID in subquery really means Person.ID, not [Order].ID. That's why I always insist on using aliases for tables in production code. Compare these two queries:
select * from Person WHERE id IN (SELECT ID FROM [Order]);
select * from Person as p WHERE p.id IN (SELECT o.ID FROM [Order] as o)
The first one will execute but will return incorrect results, and the second one will raise an error. It's because the outer query's columns may be referenced in a subquery, so in this case you can use Person columns inside the subquery.
Perhaps you wanted to use the query like this:
select * from Person WHERE pid IN (SELECT PID FROM [Order])
But you never know when the schema of the [Order] table changes, and if somebody drops the column PID from [Order] then your query will return all rows from the table Person. Therefore, use aliases:
select * from Person as P WHERE P.pid IN (SELECT O.PID FROM [Order] as O)
Just quick note - this is not SQL Server specific behaviour, it's standard SQL:
SQL Server demo
PostgreSQL demo
MySQL demo
Oracle demo
Order table doesnt have id column
Try these instead:
select * from Person WHERE id IN (SELECT OID FROM [Order])
OR
select * from Person WHERE pid IN (SELECT PID FROM [Order])
I am attempting to use a case statement but keep getting errors. Here's the statement:
select TABLE1.acct,
CASE
WHEN TABLE1.acct_id in (select acct_id
from TABLE2
group by acct_id
having count(*) = 1 ) THEN
(select name
from TABLE3
where TABLE1.acct_id = TABLE3.acct_id)
ELSE 'All Others'
END as Name
from TABLE1
When I replace the TABLE1.acct_id in the THEN expression with a literal value, the query works. When I try to use TABLE1.acct_id from the WHEN part of the query, I get a error saying the result is more than one row. It seems like the THEN expression is ignoring the single value that the WHEN statement was using. No idea, maybe this isn't even a valid use of the CASE statement.
I am trying to see names for accounts that have one entry in TABLE2.
Any ideas would be appreciated, I'm kind of new at SQL.
First, you are missing a comma after TABLE1.acct. Second, you have aliased TABLE1 as acct, so you should use that.
Select acct.acct
, Case
When acct.acct_id in ( Select acct_id
From TABLE2
Group By acct_id
Having Count(*) = 1 )
Then ( Select name
From TABLE3
Where acct.acct_id = TABLE3.acct_id
Fetch First 1 Rows Only)
Else 'All Others'
End as Name
From TABLE1 As acct
As others have said, you should adjust your THEN clause to ensure that only one value is returned. You can do that by add Fetch First 1 Rows Only to your subquery.
Then ( Select name
From TABLE3
Where acct.acct_id = TABLE3.acct_id
Fetch First 1 Rows Only)
Fetch is not accepting in CASE statement - "Keyword FETCH not expected. Valid tokens: ) UNION EXCEPT. "
select name from TABLE3 where TABLE1.acct_id = TABLE3.acct_id
will give you all the names in Table3, which have a accompanying row in Table 1. The row selected from Table2 in the previous line doesn't enter into it.
Must be getting more than one value.
You can replace the body with...
(select count(name) from TABLE3 where TABLE1.acct_id = TABLE3.acct_id)
... to narrow down which rows are returning multiples.
It may be the case that you just need a DISTINCT or a TOP 1 to reduce your result set.
Good luck!
I think that what is happening here is that your case must return a single value because it will be the value for the "name" column. The subquery (select acct_id from TABLE2 group by acct_id having count(*) = 1 ) is OK because it will only ever return one value. (select name from TABLE3 where TABLE1.acct_id= TABLE3.acct_id) could return multiple values depending on your data. The problem is you trying to shove multiple values into a single field for a single row.
The next thing to do would be to find out what data causes multiple rows to be returned by (select name from TABLE3 where TABLE1.acct_id= TABLE3.acct_id), and see if you can further limit this query to only return one row. If need be, you could even try something like ...AND ROWNUM = 1 (for Oracle - other DBs have similar ways of limiting rows returned).