Sql: Sum 3 Columns When One Column Has a Null Value

SQL: sum 3 columns when one column has a null value?

If the column has a 0 value, you are fine, my guess is that you have a problem with a Null value, in that case you would need to use IsNull(Column, 0) to ensure it is always 0 at minimum.

SQL: sum 3 columns when one column has a null value without replacing null with 0?

This solution worked for me

select 
case when coalesce(sum(ONE), sum(TWO), sum(THREE)) is null then null else 
sum(nvl(ONE,0) + nvl(TWO,0) + nvl(THREE,0)) end as 
TOTALSUM
GROUP BY ID, ANOTHERID; 

Sum on multiple columns with nullable values

--ANSI standard
    SELECT SUM(COALESCE(col1,0)) + SUM(COALESCE(col2,0)) + SUM(COALESCE(col3,0))

--SQL Server Style    
    SELECT SUM(ISNULL(col1,0)) + SUM(ISNULL(col2,0)) + SUM(ISNULL(col3,0))

--The one wthout functions. It will work the same as previous OR FASTER.    
    SELECT SUM(CASE WHEN col1 IS NULL THEN 0 ELSE col1 END) + SUM(CASE WHEN col2 IS NULL THEN 0 ELSE col2 END) + SUM(CASE WHEN col3 IS NULL THEN 0 ELSE col3 END)

Choose one for yourself.

OR you might need following (if you want to add sums by row):

--ANSI standard
    SELECT SUM(COALESCE(col1,0) +COALESCE(col2,0) + COALESCE(col3,0))

--SQL Server Style    
    SELECT SUM(ISNULL(col1,0)+ ISNULL(col2,0) + ISNULL(col3,0))

--The one wthout functions. It will work the same as previous OR FASTER.    
    SELECT SUM(CASE WHEN col1 IS NULL THEN 0 ELSE col1 END + CASE WHEN col2 IS NULL THEN 0 ELSE col2 END + CASE WHEN col3 IS NULL THEN 0 ELSE col3 END)

Is it safe to use SUM() without ISNULL()

Yes its safe . You can use Sum without handling NULL Value. You can also check that.

You can use like that also.

ISNULL(SUM(COL1),0).

Returns the sum of all the values, or only the DISTINCT values, in the expression. SUM can be used with numeric columns only. Null values are ignored.

For Reference : https://msdn.microsoft.com/en-IN/library/ms187810.aspx

Sum of null columns in SQL

You could use SQL COALESCE which uses the value in the column, or an alternative value if the column is null

So

SUM ( COALESCE(A,0) + COALESCE(B,0) + COALESCE(C,0))

MYSQL sum of multiple columns returns null

You have way too many parentheses in your expression -- but that doesn't affect the results, only the readability and maintainability.

The SUM() returns NULL only when the expression in the SUM() is NULL on all rows. This is because SUM() ignores NULL values, so if even one expression result were not NULL, then the SUM() would be not NULL.

The expression will be NULL if any of the values on a row is NULL. That is because adding NULL to any value returns NULL -- in contrast to SUM(). So, I assume that one or more of the values are NULL in any given row.

You can fix this by replacing NULL values with 0 using COALESCE():

sum( coalesce(generalSum.total, 0) + 
     coalesce(FFBHARVESTINGsum.total, 0) +
     coalesce(PRUNINGsum.total, 0) +
     . . .
   )

This has nothing to do with using a view per se.

SQL: Sum of two columns containing NULLS?

When testing for NULL use operator IS not =:

CASE WHEN Value1 IS NULL AND Value2 IS NULL THEN NULL
ELSE ISNULL(Value1, 0) + ISNULL(Value2, 0)

SQL sum different columns into one statement

In your case, you can do:

select sum(column1) + sum(column2) + sum(column3)
from table1 t;

Because each column has at least one value, the individual sums will not be NULL, so this will give the expected value.

To be safe, you could use coalesce():

select coalesce(sum(column1), 0) + coalesce(sum(column2), 0) + coalesce(sum(column3), 0)
from table1 t;

Why does Sql Sum of multiple columns containing nulls return incorrect result?

What is the sum of null and a number, exactly? Note where the 9 comes from: the only row which has non-null Column1 and Column2.

One viable solution has of course already been posted. But then, where's the fun in jumping right to the fix?

(copypasta'd at OP's request)

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