I have a table which has a column called Direct of type char(1). It's values are either 'Y' or 'N' or NULL. I am creating a view and I want the value to be transformed to either 0 or 1 of type bit. Right now it's of type INT. How do I go about doing this?
Following is the code:
CASE WHEN Direct = 'Y' THEN (SELECT 1)
WHEN Direct <> 'Y' THEN (SELECT 0) END AS DirectDebit
EDIT: How can I make sure the column type is of type BIT?
This will get you your bit..
CAST(CASE WHEN Direct = 'Y' THEN 1 ELSE 0 END AS BIT) AS DirectDebit
See if this works:
SELECT CASE WHEN Direct = 'Y' THEN 1 ELSE 0 END FROM YOURTABLE
SELECT CASE Direct
WHEN 'Y' THEN '1'
WHEN 'N' THEN '0'
ELSE '0'
END as DirectDebit
FROM TableName
... should work.
Related
How can I select a new variable?
Sample:
Select case when X=1 then 'Y'
else 'N' end as FLAG,
case when FLAG='Y' then 1
else 0 end as Y
from [table]
simply use same case for 2nd variable also for example
Select case when X=1 then 'Y' else 'N' end as FLAG,case when X=1 then '1' else '0' end as Y from [table]
As mention by #Salman ansari, you can just reuse the case for this new variable if your condition is the same.
But lets put a situation where you still want to have that case column as an actual column, you can use with:
with case_data as (
Select id,col1,col2,col3,case when X=1 then 'Y'
else 'N' end as FLAG,
from [table]
)
select id,col1,col2,cole,FLAG,case when FLAG='Y' then 1
else 0 end as Y from [case_data]
By doing that you can display your case column as a column which can be use on the outer with select.
You can explore additional information about case and with usage on:
CASE
WITH
I believe there is no solution in BigQuery. but this can be a work-around.
Select *,
case when FLAG='Y' then 1
else 0 end as Y
from (Select *,
case when X=1 then 'Y'
else 'N' end as FLAG
from [table])
I am trying to apply two conditions in one SQL Query.
(select DISTINCT (
CASE WHEN (
ABC.GemUserID = '99' )
OR ABC.GemUserID != '99'
THEN 'Yes'
ELSE 'No'
END)) AS AllWell
This gives me output as "Yes" where as the CASE is true only for 1 file like below :
Current Result:
99 , Yes
99 , Yes
99 , Yes
Expected Result:
99 , No
99 , No
99 , Yes
I am using the below query but the SQL Query Intellisence is identifying it as wrong.
Wrong Query:
(select DISTINCT (
CASE WHEN ( ABC.GEMUserID = '99' THEN 'Yes' else 'No'
CASE WHEN ( ABC.GEMUserID != '99' THEN 'No' else 'Yes'
END)) AS AllWell
After fixing the above Wrong Query:
(select DISTINCT
(CASE WHEN ABC.GemUserID = '99' THEN 'Yes' else 'No' END),
(CASE WHEN ABC.GemUserID != '99' THEN 'No' else 'Yes' END))
AS AllWell
But I am getting error:
Msg 116, Level 16, State 1, Line 17 Only one expression can be
specified in the select list when the subquery is not introduced with
EXISTS.
How to fix this?
select distinct is -- itself -- part of SQL syntax. The distinct is not a function. It should not be followed by parentheses. So, if I understand your question:
select DISTINCT
( CASE WHEN ABC.GEMUserID = '99' THEN 'Yes' else 'No' END),
( CASE WHEN ABC.GEMUserID <> '99' THEN 'No' else 'Yes' END) as AllWell
Do you plan on giving the first column a name?
select DISTINCT
CASE WHEN ABC.GEMUserID = '99' THEN 'Yes'
ELSE 'No' -- This is automatically When ABC.GEMUserID <> '99'
END AS AllWell
According to the error, your query is a subquery (probably behind IN?) in a larger SQL command. Therefore, it is not possible for such subquery to return more than one column.
So your first query, you've said:
CASE WHEN userID = 99 OR userID != 99
In other words:
CASE WHEN 1=1
This is why it returns yes for everything (not sure what the difference between your current and expected result should be considering that the userID is 99 for all rows).
For your erroneous query, seems you're returning that select in the middle of another select (since you alias it at the end). Due to that, you cannot return more than one column in your nested select. You do not need the second CASE statement, simply change your query to:
(select DISTINCT
CASE WHEN ABC.GemUserID = '99' THEN 'Yes' Else 'No' End) AS AllWell
Assuming that you hold the missing pieces to the query such as the FROM.
Is there a shorter/better way to write this SQL statement?
Edit: the inner sql select statement is a placeholder, the actual statement is more complex.
SELECT
CASE WHEN
ISNULL((SELECT TOP 1 x FROM y), '') = ''
THEN 'No'
ELSE 'Yes'
END AS BooleanValue
It feels very kludgey because it compares the result of the select statement to null, then sets to an empty string if null; just to check if it is an empty string, and set it to what it actually needs to be: a 'yes' or 'no' string.
Here's one way to do it a bit cleaner.
SELECT
CASE WHEN
(SELECT TOP 1 x FROM y) IS NULL
THEN 'No'
ELSE 'Yes'
END AS BooleanValue
This removes one extra command and should have the same output. I just tested it in sql server 2012.
SELECT ISNULL((SELECT TOP 1 'Yes' FROM x), 'No') as Boolean
I am using double case sentence to get a value from column in a table based on 2 conditions that are available in 2 other columns in same table , and else (otherwise) the function should give null when it is null or 0 when it is 0 .
Example of code is below :
CASE CODE
WHEN 'ABC'
CASE NAME WHEN 'XYZ'
THEN 'VALUE'
ELSE NULL
END
ELSE NULL
END
The problem is if I use NULL after else then it gives all ( both null values and values with 0 ) as NULL , or if I use 0 instead of NULL after ELSE then both null and 0 values are given as 0 .
I have tried to write the sentence in many ways but I dont know its not working . Hopefully somebody can give me some good solution regarding this.
CASE WHEN CODE = 'ABC' AND NAME = 'XYZ' THEN 'VALUE' ELSE NULL END
I believe you want:
CASE WHEN CODE = 'ABC' AND NAME = 'XYZ' THEN 'VALUE' ELSE NULL END
This structure of the CASE statement is more flexible than sticking the field name before WHEN.
Are you trying to do something like this?
(CASE when CODE = 'ABC' and NAME = 'XYZ'
THEN 'VALUE'
when code = '0' or name = '0'
then '0'
ELSE NULL
end)
Or perhaps it is this (based on the fact that you are trying to get something from a column):
(CASE when CODE = 'ABC' and NAME = 'XYZ'
THEN value
when value is NULL or value = 0
then value
ELSE NULL
end)
Based on your comment, I think this will work:
(CASE when CODE = 'ABC' and NAME = 'XYZ'
THEN value
ELSE NULL
end)
Or is it this:
(CASE when CODE = 'ABC' and NAME = 'XYZ' and value <> '0'
THEN 'value'
when CODE = 'ABC' and NAME = 'XYZ' and value = '0'
then '0'
ELSE NULL
end)
However, I think this is equivalent to your original nested two-case version.
I have the following problem:
I have a select statement that includes a case part. Up til there it is easy the problem is that the case includes a check against another field in the same table.
select h.id,
case h.value
when 'P' then 'test'
when '' then 'failed'
when 'D' then 'passed'
else null end
as info,
b.text,
case h.diag
when h.value = '' [or 'failed' not sure tried both and didn't work]
else h.diag end
as diag1, h.date from valuetab h, texttab b where h.id=b.id
I want to have h.diag only to show values when h.value is not failed.
I always get the mistake that the = should be concat.. but that doesn't make sense in my eyes.
Any ideas??
Thats for all your help.
You can also write a case statement with your expression in a different place i.e.
SELECT CASE WHEN X = 1 THEN 'Y' WHEN X = 2 THEN 'Z'
I think what you want to do is something more like this:
SELECT CASE WHEN h.value = '' THEN h.diag end
Use the other form of case statement, which doesn't specify a column you want to look at:
select case
when column1 = 2 then 'Foo'
when other_column = 'blah' then 'Bar'
end
from table
The problem with using case column1 when... is that it implicitly compares column1 to each when clause. You can't then include a comparison to some other column in it.
You are missing a THEN portion of the WHEN clause, and specifying a condition where you could specify a value:
case h.value
when '' THEN NULL
else h.diag end
Ok got it....
after the 2nd case the "h.diag" must be removed....
so it is
case
when h.value = '' then null
else h.diag end
as diag1,