Can we do sum of different columns in MS SQL server

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I want to do sum of different columns data

What I have tried:

select (column1+column2+column3) as 'column4'
but in this case i am not getting proper o/P.
for eg:column1 data=7.8
column2 data=7.0
column3 data= 8.9
ten o/P is coming like 7.8.7.9.8.9

Posted 21-Aug-16 22:49pm

Member 12363094

Updated 22-Aug-16 19:43pm

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phil.o 22-Aug-16 4:58am

Which datatype(s) are column1, column2 and column3?

Member 12363094 22-Aug-16 5:09am

ooh that is varchar type

4 solutions

Solution 1

Looks like you have a problem with your DB: those values are stored as string based data (VARCHAR or NVARCHAR) instead of numeric fields. As a result, the strings are added as strings instead of as numbers.

While you could use CONVERT on each of the columns, it's a kludge round a serious problem. Change your DB: always store values in the most appropriate form: INT or FLOAT for numbers, DATE or DATETIME for dates, and only string based data goes in NVARCHAR or VARCHAR columns. If you don't this isn't the only problem it's going to give you...

Posted 21-Aug-16 23:14pm

OriginalGriff

Solution 5

SQL

SELECT 
   column1,
   column2,
   column3,
   (column1 + column2 + column3) as 'column4'
FROM table

Posted 22-Aug-16 19:43pm

Daniel Jones

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CPallini · Accepted Answer · 2016-08-21T23:15:00

Solution 2

Since your operands are strings, the + (String Concatenation) (Transact-SQL)[^] operator is used.
You have to convert the operands to numbers in order to use the arithmetic + (Add) (Transact-SQL)[^] operator.
See CAST and CONVERT (Transact-SQL)[^].

BTW: using numerical data types (instead of varchars) for holding numbers looks more natural to me.

Posted 21-Aug-16 23:15pm

CPallini

Updated 21-Aug-16 23:17pm

v2

Comments

Member 12363094 22-Aug-16 5:32am

then i have to convert varchar to float?

CPallini 22-Aug-16 5:38am

Yes, or decimal, depending on your needs.

Karthik_Mahalingam · Accepted Answer · 2016-08-22T03:32:00

Solution 3

Refer Solution 1 and 2 for explanation

SQL

select  (CAST( column1 as float) + CAST( column2 as float)+ CAST( column3 as float)) as 'column4' from YourTable

Posted 22-Aug-16 3:32am

Karthik_Mahalingam