calculate Row Wise Sum - Sql server

sql sql-server-2008 calculated-columns
Uday picture Uday · Aug 15, 2013 · Viewed 51.4k times · Source

This is My table :

ID              Q1         Q2           Q3            Q4
----------------------------------------------------------------
20130712        NULL       728.63       NULL            NULL
20130712        8881.55    9673.68      2629.566        6251.984
20130713        1813       1813         84.49           1728.51
20130714        3632.65    3632.65      1209.412        2423.238
20130714        70.758     2637.43      70.758          0
20130714        1601.578   3569.73      204.745         1396.833
20130714        728.63     728.63       0               728.63
20130714        1401.629   2251.39      94.418          1307.211
20130715        583.956    5089.19      583.956         0
20130805        6317.277   8958         2629.566        3687.711

I want the output like below.(The columns might change dynamically, needs to calculate Sum by row wise)

ID              Q1         Q2           Q3            Q4             SUM(Q1:Q4)
---------------------------------------------------------------------------
20130712        NULL       728.63       NULL            NULL         728.63   
20130712        8881.55    9673.68      2629.566        6251.984     27436.78
20130713        1813       1813         84.49           1728.51      5439
20130714        3632.65    3632.65      1209.412        2423.238     ...
20130714        70.758     2637.43      70.758          0
20130714        1601.578   3569.73      204.745         1396.833
20130714        728.63     728.63       0               728.63
20130714        1401.629   2251.39      94.418          1307.211
20130715        583.956    5089.19      583.956         0
20130805        6317.277   8958         2629.566        3687.711

Answer

Ed Gibbs picture Ed Gibbs · Aug 15, 2013

You haven't shown your query attempt, but it's probably something like this:

SELECT
  ID, Q1, Q2, Q3, Q4,
  Q1 + Q2 + Q3 + Q4 AS "Total"
FROM MyTable

If any of the Q1, Q2, Q3, or Q4 values are null, Q1 + Q2 + Q3 + Q4 will be null. To treat the nulls as zero and get a proper sum, do this instead:

SELECT
  ID, Q1, Q2, Q3, Q4,
  COALESCE(Q1,0) + COALESCE(Q2,0) + COALESCE(Q3,0) + COALESCE(Q4,0) AS "Total"
FROM MyTable

The COALESCE function will return the first non-null value in the list.

Related questions

How can I alter this computed column in SQL Server 2008?

I have a computed column created with the following line: alter table tbPedidos add restricoes as (cast(case when restricaoLicenca = 1 or restricaoLote = 1 then 1 else 0 end as bit)) But, now I need to change this column for something like: alter table …

Read More
formula for computed column based on different table's column

Consider this table: c_const code | nvalue -------------- 1 | 10000 2 | 20000 and another table t_anytable rec_id | s_id | n_code --------------------- 2 | x | 1 The goal is to have s_id be a computed column, based on this formula: rec_id*(select nvalue …

Read More
Creating date in SQL Server 2008

Is there something similar to DATEFROMPARTS(year, month, day) in SQL Server 2008? I want to create a date using the current year and month, but my own day of the month. This needs to be done in one line in …

Read More