Finding Sum of the column whose column name is numeric value

HI All -
I have column names as years like 1990, 1991, 1992 and there are certain amount like below
*1990 1991 1992*
1000 5000 6000
2000 2000 3000
SUppose I want to find the sum of the amounts for year 1990, and I use the query like Select SUM(1990), it returns the sum of 1990+1990. How to make sure that 1990 is recognized as a column instead as a number.
Thanks

Hi,
To reference a column name that does not follow the normal rules (and starting with a digit does not follow the normal rules), then enclose the column name in double--quotes:
... SUM ("1990"), ...You can enclose any identifier in double-quotes, even ones that do follow the normal rules, but remember that anything inside any kind of quotes is case-sensitive.
If your query is assigning column aliases, like "1990", you might want to assign them only in the main query, after all references to them (like the SUM function you mentioned) have been done.
Depending on your front-end, you might get the same results by having the front end do the aliasing. For example, the SQL*Plus COLUMN command can assign an alias (like "1990") to a more gernerically named column (like year_1). Then you could use the noramlly named column throughout the query:
COLUMN year_1 HEADING "1990"
SELECT year_1
... SUM (year_1)
...

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