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# Year-to-date period totals

## I have a table with 12 columns labeled Period1 to Period12. All columns contain numerical values. I would like to create a function, or stored procedure, which you can pass in the Current Period and create a Year to Date total.

I have a table with 12 columns labeled Period1 to Period12. All columns contain numerical values.

```Period1 | Period2 | Period3 etc.
1000      2000       500 ```

I would like to create a function, or stored procedure, which you can pass in the Current Period and create a Year to Date total.

```Year to Date for Period 2 -
YTDTotal
3000

Year to Date for Period 3 -
YTDTotal
3500
etc.```

Hope you can answer this. Have looked at other answers, and all are based on summing a fixed number of columns. This needs to be more dynamic.

Here's what you will need --

```select Period1
+Period2
from ...

select Period1
+Period2
+Period3
from ...

etc.```

The way to make this "dynamic" is to generate the SQL in your application code (whether this is in a stored procedure or whatever). This won't be truly dynamic because you will need to EXEC the dynamic query string.

A better solution is to design your table differently. Instead of 12 columns, create a table with two columns -- Period Number and Amount. Then in Period 1 there would be one row, in Period 2 you add another row, and so on. In this way, you can make the SQL truly dynamic, like this --

```select sum(Amount)
from ...
where PeriodNumber <= 2

select sum(Amount)
from ...
where PeriodNumber <= 3

etc.```

Now, that's a lot nicer, isn't it? And by making the period number a parameter, the query can be compiled in the stored proc and so be even more efficient.

This was last published in April 2006

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