I do a sum function over a column. But the column can have string values also. I want SQL Server to ignore the string values and sum only the string values.
Eg: column can have values like 16000Euro or 2588, or 3671.
The input is from user and I cant change validation in the app to integer
I have tried this but still shows error:
SUM(CASE WHEN Type_New = 202 AND ISNUMERIC(Summe) = 1
THEN Summe
ELSE 0
END) AS total_Euro
So how can I ignore the string values when doing sum operation?
The error I get is:
Error converting nvarchar value '2588. 'in the int data type.
EDIT: I want SQL to ignore such string values and sum what it can.. The main aim is that Query should not throw any error
Try the below Query, it will work perfectly :)
SELECT SUM(CASE WHEN Type_New = 202 AND ISNUMERIC(Summe + '.0e0') = 1
THEN Summe
ELSE 0
END) AS total_Euro FROM TableName
IsNumeric returns 1 if the varchar value can be converted to ANY number type (includes int, bigint, decimal, numeric, real & float) Values like 1e4,1., 2.0 will create the issue if the above check to bypass these values is not added.
You should not name column same as a keyword in SQL Server , if this cannot be avoided you can escape column name by enclosing in square bracketes [Sum] as shown below
SELECT SUM(CASE WHEN Type = 202 AND ISNUMERIC([Sum]) = 1 THEN [Sum] ELSE 0 END) AS total_Euro
Try this
SUM(CASE WHEN Type = 202 AND case when Sum not like '%[^0-9]%' THEN Sum END ELSE 0 END) AS total_Euro
or
SUM(CASE WHEN Type = 202 AND ISNUMERIC(Sum+'.e0') = 1 THEN Sum ELSE 0 END) AS total_Euro
Try this:
SUM (CASE
WHEN Type_New = 202 AND ISNUMERIC(Summe) = 1 THEN CAST(summe AS DECIMAL(9,2))
ELSE 0 END) AS TotalEuro
I don't know if you do this SUM for one column or what, but also you can filter out what you need and then sum:
SELECT SUM(Summe) AS total_Euro
FROM someTable
WHERE Type_New = 202 AND ISNUMERIC(Summe) = 1
ISNUMERIC function considers strings that contain large numeric (e.g., 9223372036854775808), decimals (e.g., 12.4), currency figures (e.g., $123), and floating-point values (e.g., 1E2) to be strings that can be converted to a numeric data type.
Now to calculate Sum you will have to convert string to an integer[ this assumption is based on
sample data you have posted] but fact is string can be numeric but might not be convertible to an integer; the ISNUMERIC function is limited in the sense that it can tell you only whether the string can be converted to any numeric data type.
So if your column doesn't have string data like 1E3 or 12.4 or $123 which are numeric but not integers you can simply cast the target column to int as below and calculate the sum :
select SUM(CASE WHEN Type_New = 202 AND ISNUMERIC(Summe) = 1
THEN CAST(Summe AS INT)
ELSE 0
END) AS total_Euro
FROM test
else you shoudl go for a more generic function which as discussed here..
http://sqlmag.com/t-sql/can-i-convert-string-integer
Related
I am trying to accommodate for some rogue values in my database, that contain the string 'unknown', I want to set these to 0 and then sum the rest. But for some reason, this isnt happening. Here is what I have -
Values - VARCHAR(30) -
3
0.1
2
16
2
5
2
Unknown
2.4
7
Unknown
And here is my Cast,Sum,Case
Cast(sum(case when stake = 'Unknown' then 0 else stake end) as float) as totalStake
But I get this error - Conversion failed when converting the varchar value '0.1' to data type int.
Help!
Thanks
You must cast stake as a float:
sum(case when stake = 'Unknown' then 0.0 else cast(stake as float) end) as totalStake
You should explicitly convert to some sort of numeric values. Try this:
sum(try_convert(numeric(18, 4), stake)) as totalStake
Your code has at least two issues. First, your case expression returns an integer (because the first then has an integer). So, it tries to convert stake to an integer, which can generate an error.
Second, you should be doing arithmetic operations on data that is explicitly some sort of number type and not rely on implicit conversion.
You can try the following query using isnumeric() to check numeric data.
create table temp (stake VARCHAR(30))
insert into temp values
('3'), ('0.1'), ('2'), ('16'), ('2'), ('5'), ('2'), ('Unknown'), ('2.4'), ('7'), ('Unknown')
--Select * from temp
Select sum(Cast(stake as Float)) from temp where isnumeric(stake) = 1
To handle some exception like null values or . values only you can try this
Select SUM(TRY_CAST(stake as Float)) from temp
You can find the live demo Here.
Initial step would be to replace the 'Unknown' string with 0 using a replace function and then convert the column datatype to the one which allows to perform Aggregate functions and then perform SUM on top of that. The below query will work only for 'unknown' string, if you have different strings other than 'unknown' you might have to choose a different approach like using IsNumeric in Replace function and update the string value to 0.
select sum(cast((REPLACE(stake,'unknown',0)) as float)) from table
This happens because SQL has some problems while converting decimal values to integer values.
In facts, function sum returns integer values
I solved it using round function on the values1 variable ( sorry for using same name for table and column ):
select Cast(sum(case when values1 = 'Unknown' then 0 else round(values1, 2) end) as
float)as totalstrike
from values1
I have a select statement as follows
SELECT t5.Name AS ProductName
, CAST (t5.salerevenue AS DECIMAL(20,3)) AS Revenue
, CASE WHEN t5.PreviousRevenue <> 0 THEN CAST(t5.PresentRevenue/t5.PreviousRevenue*100 AS STRING)
ELSE 'NA'
END AS RevenueTrend
I want to cast the RevenueTrend as a decimal with maximum 3 point scale (20.123)
I have to cast it as String because WHEN t5.PreviousRevenue <> 0 is not met I have to show it as 'NA'
I tried doing it as follows
CASE WHEN t5.PreviousRevenue <> 0 THEN CAST((CAST(t5.PresentRevenue/t5.PreviousRevenue*100) AS DECIMAL(20,3)) AS STRING)
ELSE 'NA'
END AS RevenueTrend
but I am getting a syntax error.
The revenue part is projected as expected. I want the revenuetrend part also to be projected like revenue. Is there any way to achieve this?
Try converting first to a decimal, then to a string:
SELECT . . .
(CASE WHEN t5.PreviousRevenue <> 0
THEN CAST(CAST(t5.PresentRevenue/t5.PreviousRevenue*100 AS DECIMAL(20,3)) as string)
ELSE 'N/A'
END) AS RevenueTrend
I have a requirement to move varchar column data to Numeric but with two conditions.
All the alphanumeric value should migrate as null
All the decimal values should go as it is.
I wrote the condition as WHERE data like '%[^0-9]%', it is working fine for all the records except for decimal.
Also I have values like .001 abcd, this has to be pass as null.
To summarize I need :
1) 1234 as 1234
2) 1.23 as 1.23
3) ABC as null
4) .ABC as null
There is by default function in SQL Server ISNUMERIC() so, first of all Check your data value by that function,
Select ISNUMERIC(DATA)
Whole query is written as below,
SELECT CASE WHEN ISNUMERIC(data)=1 THEN CAST(data as decimal(18,2))
ELSE NULL END as tData FROM DataTable
As per your question,first we have to convert with numeric with using case,which satisfies your first condition,another thing if the value is String than convert as NULL. In Above query both the condition has been taken care.
EDIT : If you are using SQL SERVER 2012 or higher version then use
TRY_PARSE(), then there will be no need to worry about using CASE too...
I have tried this,
SELECT TRY_PARSE('63.36' as decimal(18,2)) got result 63.36
and
SELECT TRY_PARSE('.' as decimal(18,2)) got result NULL
I think that this fits your spec. It is quite verbose, but hopefully it breaks down the conditions sufficiently that it's clearly doing the correct thing or, if it isn't, that it's easy enough to modify:
declare #t table (data varchar(30))
insert into #t(data) values
('1234'),
('1.23'),
('abc'),
('.abc'),
('+6000'),
('1.2.3')
select
CASE WHEN
Possible = 1 AND
(DecCheck = 0 OR
SingleDec = 1
) THEN
CONVERT(decimal(12,3),data)
END
from
#t t
cross apply
(select
--Only contains the correct characters
CASE WHEN not t.data like '%[^0-9.]%' THEN 1 ELSE 0 END as Possible,
--Contains a decimal point? (Needs more checks)
CASE WHEN CHARINDEX('.',t.data) > 0 THEN 1 ELSE 0 END as DecCheck,
CHARINDEX('.',t.data) as FirstDec --Where the first decimal point is
) p
cross apply
(select
CASE WHEN DecCheck = 1 THEN
--Only contains one decimal point
CASE WHEN LEN(data) = FirstDec + CHARINDEX('.',REVERSE(data)) - 1
THEN 1
ELSE 0 END
ELSE 0 END as SingleDec
) d
Results:
data
------------------------------ ---------------------------------------
1234 1234.000
1.23 1.230
abc NULL
.abc NULL
+6000 NULL
1.2.3 NULL
I.e. one additional check you may want to use is that a decimal cannot be the first or last character in the string. That is easy enough to do by adding those additional checks into the first CASE for the SingleDec column.
try ISNUMERIC function,
SELECT ISNUMERIC('abc')
SELECT ISNUMERIC('1.23')
On SQL Server (Version 2012, 11.0.5343)
SELECT
CASE WHEN ISNUMERIC('.') = 1 THEN <Field> ELSE 0 END
FROM
<Table>
works fine ...
Thre is A blog post.
Try following
SELECT
CASE
WHEN
ISNUMERIC(data + 'e0') = 1 THEN CAST(data AS decimal(18,2))
ELSE NULL END AS tData
FROM
DataTable
try ISNUMERIC function
DECLARE #MyTable TABLE(Val VARCHAR(100))
INSERT INTO #MyTable
VALUES
('1234')
,('1.23')
,('ABC')
,('.ABC')
,('MJA')
Select Val as OldValue,
Case
When ISNUMERIC(Val) = 1
then Cast(Val as numeric(18,2))
else null
end NewValue
From #MyTable
Output
OldValue NewValue
-----------------------------------------------------
1234 1234.00
1.23 1.23
ABC NULL
.ABC NULL
MJA NULL
(5 row(s) affected)
I have data like
id
27.45
29.1
27.45
21.95
18.1
51.75
0
21.45
41.94
21.95
32.95
My query is
SUM(CASE WHEN ab.dates BETWEEN bc.fst_sales_date AND BC.[WEEK4] THEN
[salesval] -- my initial try
ELSE 0 END) week4_qtyvalues
facing error
Conversion failed when converting the nvarchar value '41.94' to data
type int.
I have checked
SUM(CASE WHEN ab.dates BETWEEN bc.fst_sales_date AND BC.[WEEK4] THEN
CONVERT(float,[salesval]) -- this is what I've tried
ELSE 0 end) week4_qtyvalues
and
SUM(CASE WHEN ab.dates between bc.fst_sales_date AND BC.[WEEK4] THEN
CAST([salesval]AS int) -- this is what I've tried
ELSE 0 END) week4_qtyvalues
Regardless of my tries , I'm still facing the same error.
DECLARE #t TABLE (id VARCHAR(10))
INSERT INTO #t (id)
VALUES
('27.45'),('29.1'),('27.45'),('21.95'),('18.1'),
('51.75'),('0'),('21.45'),('41.94'),('21.95'),('32.95')
SELECT SUM(CASE WHEN id IS NOT NULL THEN CAST(id AS FLOAT) ELSE 0 END)
FROM #t
That is happening because you have a nvarchar and not a float number to cast to int. You should first cast the [salesval] to float and after that cast it to int. Something like this:
CAST(CAST([salesval] AS float) AS INT)
Because of the way SQL Server handles statements with multiple data types mixed together, it'll still try to take your salesval field and treat it as an int.
So, firstly, try casting the 0 as well.
And secondly, you almost certainly don't want to use float - it's for scientific calculations that need its huge range only and isn't precise. Try decimal instead.
A SQL Table (Trades) has three fields AvgProfit, MinProfit and Hold - Hold is a Computed Colum...
If AvgProfit < MinProfit, Hold = 'Hold' and if AvgProfit > MinProfit, Hold = 'Trade'
The Computed Col formula for Hold is as follows.
SQL Table Trades
AvgProfit varchar(35)
MinProfit varchar(35)
Hold varchar(35)
(case when CONVERT([decimal](8,4),isnull([AvgProfit],(0)),(0))>=CONVERT([decimal](8,4),isnull([MinProfit],(0)),(0)) then 'Trade' else 'Hold' end)
PROBLEM: Updates cause the AvgProfit to be empty at times and this results in an error when the table references the Hold formula
'Error Converting varchar to numeric'
How do I add IS NULL or EMPTY to the above formula, the ISNULL does not catch AvgProfit = '' ??
Consider typing your database with decimal or numeric columns as paxdiablo has suggested. Is there a reason why those columns are set as varchar?
Alternatively if you have to keep your varchar columns, try ISNUMERIC(), http://msdn.microsoft.com/en-us/library/ms186272.aspx. It works with all common SQL numeric types. So you query might become:
ISNUMERIC can be used like this:
select case when ISNUMERIC('123') = 1 then 1 else 0 end ' returns 1
select case when ISNUMERIC('xyz') = 1 then 1 else 0 end ' returns 0
select case when ISNUMERIC(null) = 1 then 1 else 0 end ' returns 0
So your query might become:
case when isnumeric(AvgProfit) = 1 THEN case([AvgProfit] as decimal) else 0 END
Or something similar.
varchar columns should be used for VARiable sized CHARacter columns, not for numeric data.
In other words, they shouldn't be empty (other than NULL, of course, but you've taken care of that).
If you cannot fix that little oversight for some reason, you can make your queries even more complex and slower :-) by doing something like:
select case when xyz = '' then 0 when isnull(xyz) then 0 else xyz end ...
In other words, check for both NULL and empty varchar values.
Myself,I'd fix the schema since it'll be better for you in the long term. I'm merely offering the other solution on the chance that you're not able to do that.