sum of multiple columns in ORACLE - oracle

Question

I have a table that has 97 columns, I want to sum 96 columns.
select sum(col1+col2+col3+.....+col96)
from tableA where meter_id=x;
I do not want to give all 96 column names, what is the best way to do it?
Regards,
RR

Answer 1

There is no way to avoid writing each column name. All you can do is curse the stupid data modeller and get busy with cut'n'paste.

Answer 2

In the case where there are a significant number of columns, I would look at using the data dictionary tables to help create the query by using a query like the one below:
Select column_name || '+' as column_name_list
From user_tab_columns
Where table_name = 'TABLEA'
Order by column_id
It doesn't change the world but does simplify writing one query.

Answer 3

You could create a virtual column that adds up your 96 columns, something like:
alter table TABLEA add (MY_TOTAL_COL NUMBER GENERATED ALWAYS AS (col1+col2+col3...) VIRTUAL);
Then your query can simply do sum(my_total_col).

Answer 4

You might be best to sum the columns and then put the result in Excel to do the sum of sums. Otherwise this query should do what you need:
SELECT SUM(TOTAL_SUM) FROM (
SELECT SUM(column1) AS TOTAL_SUM FROM your_table
UNION
SELECT SUM(column2) AS TOTAL_SUM FROM your_table
UNION
SELECT SUM(column3) AS TOTAL_SUM FROM your_table
);

Answer 5

SELECT A.consol_key,
A.amt_lcy,
B.amt_lcy,
C.amt_lcy
FROM categ A,
spec B,
stmt C;
SELECT Sum(total_sum)
FROM (SELECT Sum(amt_lcy) AS TOTAL_SUM
FROM categ
UNION
SELECT Sum(amt_lcy) AS TOTAL_SUM
FROM spec
UNION
SELECT Sum(amt_lcy) AS TOTAL_SUM
FROM stmt)
WHERE table_id NOT IN (SELECT table_id
FROM categ
WHERE txn_code = 'COR'
AND system_id <> 'AA');

Answer 6

It could be possible:
Using Can an SQL procedure return a table?
and the answer of Mike Meyers you could write a stored procedure using dynamic sql
sumcolumns(columnfilter,tablename,whereclause)
and use it something like
select *
from table(sumcolumns('column_name <> ''col97''','tableA','meter_id=x'))

Answer 7

Try using UNPIVOT as per example below (still need to specify the column list as others have noted):
with tableA as /* prototype tableA just for example */
(
select 1 meter_id, 101 col1, 10 col2, 20 col3, 30 col4, NULL col5, 101 col11, 10 col12, 20 col13, 30 col14, NULL col15, 101 col21, 10 col22, 20 col23, 30 col24, NULL col25 from dual union
select 2, 102, 40, NULL, 50, NULL, 102, 40, NULL, 50, NULL, 102, 40, NULL, 50, NULL from dual union
select 3, 103, 60, 70, 80, 90, 103, 60, 70, 80, 90, 103, 60, 70, 80, 90 from dual union
select 4, 104, 100, NULL, NULL, NULL, 104, 100, NULL, NULL, NULL, 104, 100, NULL, NULL, NULL from dual
)
, unpivoted_tableA as /* UNPIVOT tableA columns into rows */
(
select *
from tableA
unpivot include nulls
(
col_value for col_ in
(COL1,COL2,COL3,COL4,COL5,COL11,COL12,COL13,COL14,COL15,COL21,COL22,COL23,COL24,COL25)
)
)
/* main query - Sum of all columns that were unpivoted to rows */
select meter_id, sum(col_value)
from unpivoted_tableA
group by meter_id
;