I am trying to create an update statement on SQL Server to set one of the cards as default and all the others as not, however, if I have 3 cards and card 1 set to default and now I want to set card 2 as default I get all 3 cards set as updated, when I should only set cards 1 and 2. I am currently using the following query:
UPDATE Card
SET
ModifiedDateTimeUtc = #ModifiedDateTimeUtc,
IsDefault = CASE WHEN Id = #CardId THEN 1 ELSE 0 END
WHERE CustomerId = #CustomerId;
I need to modify this query so only the cards with values updated get to set a new modified date/time.
PS, I cannot use triggers on this database (unfortunately) so I need to find a solution using a "simple" SQL statement.
Maybe it could be write in other ways but you can do like this:
UPDATE Card
SET
ModifiedDateTimeUtc =
CASE WHEN Id = #CardId THEN
CASE WHEN IsDefault = 1 THEN ModifiedDateTimeUtc ELSE #ModifiedDateTimeUtc END
ELSE
CASE WHEN IsDefault = 0 THEN ModifiedDateTimeUtc ELSE #ModifiedDateTimeUtc END
END,
IsDefault = CASE WHEN Id = #CardId THEN 1 ELSE 0 END
WHERE CustomerId = #CustomerId;
What should do this?
If the Id is the same with the parameter and the old value, before update, is 1, datetime will be the same, no update will be made, else (means old value = 0) then it will be updated. And the same for old value= 0...
Is this what you want?
UPDATE Card
SET ModifiedDateTimeUtc = #ModifiedDateTimeUtc,
IsDefault = (CASE WHEN Id = #CardId THEN 1 ELSE 0 END)
WHERE CustomerId = #CustomerId AND
IsDefault <> (CASE WHEN Id = #CardId THEN 1 ELSE 0 END);
Usually, I wouldn't repeat a CASE expression in the WHERE. In this case, though, this is the new value for the column, so I think it is a clean expression of the logic.
Related
I just finished migrating an Access database to the SQL Server and I need to fix the Yes/No values to be defaulted to No as their data type conversion is set to bit.
I do this by setting the default value to 0.
However, I want to execute a query to do that as well, but there are multiple bit rows.
I know how to use multiples with the SET command, but how do we use multiple with WHERE? What is the proper way of structuring it?
UPDATE sometable SET
[isConditionOnePassed] = 0
, [isSecondPassed] = 0
, [isThirdPassed] = 0
WHERE [isConditionOnePassed] IS NULL, [isSecondPassed] is NULL, [isThirdPassed] IS NULL
Or is it with an AND? Like boolean logic?
UPDATE sometable SET
[isConditionOnePassed] = 0
, [isSecondPassed] = 0
, [isThirdPassed] = 0
WHERE [isConditionOnePassed] IS NULL and [isSecondPassed] is NULL and [isThirdPassed] IS NULL
Hmmm . . . If you want to set NULL values to another value, you can use COALESCE():
UPDATE sometable
SET isConditionOnePassed = COALESCE(isConditionOnePassed, 0),
isSecondPassed = COALESCE(isSecondPassed, 0),
isThirdPassed = COALESDCE(isThirdPassed, 0)
WHERE isConditionOnePassed IS NULL OR isSecondPassed is NULL OR isThirdPassed IS NULL;
Seems like what you really need is an ISNULL or CASE expression. Here is an example with both:
UPDATE dbo.SomeTable
SET isConditionOnePassed = ISNULL(isConditionOnePassed,0),
isSecondPassed = CASE isSecondPassed WHEN 1 THEN 1 ELSE 0 END;
I know this is already asked question and possible to be close.
But i really want a answer, I already searched through the internet, Read documentations, Blogs, and Question to SO.
This is my Query so Far,
declare #count numeric
select #count = (select count(1) from E496_TitleReference a where
exists (select 1 from #tempTransactions b where a.EPEB_RoD = b.tEPEB_RoD and
a.EPEB_ENO = b.tEPEB_ENO and a.EPEB_ID = b.tEPEB_ID and a.Title_Seq = b.tTitle_Seq))
update E496_TitleReference
set PrintStatus = '{0}',Is_AESM=isnull(-1,Is_AESM)
from E496_TitleReference a where
exists (select 1 from #tempTransactions b where a.EPEB_RoD = b.tEPEB_RoD and
a.EPEB_ENO = b.tEPEB_ENO and a.EPEB_ID = b.tEPEB_ID and a.Title_Seq = b.tTitle_Seq)
if ##rowcount <> #count
begin
rollback tran
Print "Error: There is an error on table E496_TitleReference."
return
end
go
For eg, In my table in Database i have column name Is_AESM, In Is_AESM column it have 4 values.
Is_AESM
NULL
NULL
-1
-2
Something like this.
Now when i run my script, it has no problem when i run it,
Is_AESM=isnull(-1,Is_AESM)
In this query it will detect if Is_AESM is null, it will update Is_AESM = -1 if not it will retain the value.
Now my problem is, if my query detect Is_AESM has a null value, it will update all the value to -1.
Is_AESM
-1
-1
-1
-1
The result is something like that. Now i want is update only the null value not all the value in column Is_AESM.
I think this query is wrong Is_AESM=isnull(-1,Is_AESM).
Any ideas will be a big help.
You may try with coalsece() function
update E496_TitleReference
set PrintStatus = '{0}',Is_AESM=coalsece(Is_AESM,-1)
from E496_TitleReference a where
exists (select 1 from #tempTransactions b where a.EPEB_RoD = b.tEPEB_RoD and
a.EPEB_ENO = b.tEPEB_ENO and a.EPEB_ID = b.tEPEB_ID and a.Title_Seq = b.tTitle_Seq)
you need to replace order of parameters.
Is_AESM=isnull(Is_AESM, -1)
You can use COALSECE function. It returns the first non-null entry from the given list. So:
Is_AESM= COALSECE(IS_AESM,-1)
This will return IS_AESM value if it is not null (since it is the first non-null value)
Else if IS_AESM is NULL then it returns -1 (since it is the non-null value)
I was just woking trough some old final exams as I stumbled across this task:
Table:
Create a single SQL query from this table which will check if Art_MWStSatz is 7% and set Art_Markierung to 1 if it is, else set Art_Markierung to 0.
I dont't have any idea on how to solve this. I asked my teacher by she didn't know an answer either.
Some translations:
Artikel = Item
MWSt Satz = vat rate
Markierung = mark
I don't have access to the solution so it all depends in your answers.
Use an UPDATE and a CASE. This assumes that '7%' is a string and not the int '7'
UPDATE table
SET
Art_Markierung = CASE
WHEN Art_MWStSatz = '7%'
THEN 1
ELSE 0
END;
I presume that 1 or 0 is true or false. In this situation, you can use a CASE like this:
UPDATE MyTable
SET Art_Markierung = CASE Art_MWStSatz
WHEN '7%' THEN CAST(1 AS bit)
ELSE CAST(0 AS bit)
END
Assume Art_Markierung and Art_MWStSatz are integer:
UPDATE Artikel
SET Art_Markierung =
CASE
WHEN Art_MWStSatz = 7 THEN 1
ELSE 0
END
This is what I am trying to do. Basically I have some columns deliberately left blank in table Staging_X and to be updated later. I would like to update those columns using the case conditions below. I want to implement this in a stored procedure.
UPDATE Staging_X
SET Staging_X.[NoMaterial]
(SELECT (case
when ((([Up]+[Test])+[Mon])+[Down_percentage])*(1.68)=(0)
then (168) else [Lost]*(1.68)
end)
FROM Staging_X)
UPDATE Staging_X
SET [NoMaterial] =
case when [Up]+[Test]+[Mon]+[Down_percentage]=0
then 168 else [Lost]*1.68 end
WHERE [NoMaterial] is null
If I understand you correctly, you dont need a selected like that as the values are all in the same row.
So try something like
UPDATE Staging_X
SET Staging_X.[NoMaterial] =
case
when ((([Up]+[Test])+[Mon])+[Down_percentage])*(1.68)=(0)
then (168)
else [Lost]*(1.68)
end
more simply
UPDATE [Staging_X]
SET [NoMaterial] =
CASE [Up]+[Test]+[Mon]+[Down_percentage]
WHEN 0 THEN 168
ELSE [Lost] * 1.68
END
I've got a case statement:
UPDATE
Answer
SET
AnswerID = #AnswerID,
AnsweredBy = CASE WHEN LEN(#AnsweredBy) > 0 THEN #AnsweredBy END
Even when #AnsweredBy is NULL it still sets the AnsweredBy column to null.
I've tried to test for null as well by doing this:
UPDATE
Answer
SET
AnswerID = #AnswerID,
AnsweredBy = CASE WHEN #AnsweredBy IS NOT NULL THEN #AnsweredBy END
Meaning I do not want to update the answeredby column unless there is a value.
Even in my C# code I do not pass a value to my stored procedure:
if (answeredBy.Length > 0)
cmdSelect.Parameters.Add("#AnsweredBy", SqlDbType.VarChar).Value = answeredBy;
unless there is a value. And in my sproc I default that column variable to null:
#RunoffAnswerID bigint,
#AnswerID varchar(3)=NULL,
#AnsweredBy varchar(50)=NULL,
So my question is how do I perform the rest of my updates, because there are about 5-10 more columns but only update the answeredby if there is a value in #AnsweredBy?
SET AnsweredBy = ISNULL(#AnsweredBy, AnsweredBy)
UPDATE
Answer
SET
AnswerID = #AnswerID,
AnsweredBy = CASE WHEN LEN(#AnsweredBy) > 0 THEN #AnsweredBy ELSE AnsweredBy END