SQL : Update value when the value in the database is null

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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)

How do I set a column value to NULL in SQL Server Management , How do I change a value to null in SQL? In this tutorial you can learn how to work with NULL in MySQL tables: Insert, Update, and Select columns with NULL value. Add column with NULL value To insert into a MySQL table rows with columns having NULL, add the NULL value without quotes.


you need to replace order of parameters.

Is_AESM=isnull(Is_AESM, -1)

SQL SERVER: Check if variable is null and then assign statement , How do you check if a value is null in SQL? ISNULL () is a T-SQL function that allows you to replace NULL with a specified value of your choice. Here’s a basic query that returns a small result set: SELECT TaskCode AS Result FROM Tasks; Result ------ cat123 null null pnt456 rof789 null. We can see that there are three rows that contain null values. If we didn’t want the null values


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)

Null (SQL), should not be confused with a value of 0. In databases a common issue is what value or placeholder do you use to represent a missing values. In SQL, this is solved with null. It is used to signify missing or unknown values. The keyword NULL is used to indicate these values. NULL really isn’t a specific value as much as it is an indicator. Don’t think of NULL as similar to zero or


A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this  Not exactly an answer to the question as asked, but rather than having a trigger reset the MidName value, I would probably introduce a constraint to prevent the column from having a value: ALTER TABLE dbo.Seller ADD CONSTRAINT CK_Seller_MidName CHECK (MidName IS NULL OR Type = 'Ind'); -- or: OR Type <> 'Org'


UPDATE [table] SET [column]=0 WHERE [column] IS NULL; Null Values can be replaced in SQL by using UPDATE, SET, and WHERE to search a column in a table for nulls and replace them. In the example above it replaces them with 0. Cleaning data is important for analytics because messy data can lead to incorrect analysis. SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL And, Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL


The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL Duration: 2:25 Posted: May 27, 2016 Introduction to MySQL NULL values. In MySQL, a NULL value means unknown. A NULL value is different from zero (0) or an empty string ''. A NULL value is not equal to anything, even itself. If you compare a NULL value with another NULL value or any other value, the result is NULL because the value of each NULL value is unknown.