# Beast Mode for Sum Function

Hi All,

I am using the sum function below which is throwing an error..can you please advise..

CASE WHEN YEAR(`DATE`) = year(CURRENT_DATE()) THEN SUM(`CURRENT_INVENTORY`,`NONCURRENT_INVENTORY`,`OLD_INVENTORY`) END

• Coach

SUM only takes a single argument. You'll need to add them together. Note that I'm adding 3 sums together as it will handle nulls otherwise if I add `CURRENT_INVENTORY` + `NONCURRENT_INVENTORY` + `OLD_INVENTORY` and if any one of those values is null then the entire value will be null causing incorrect summations.

```SUM(CASE WHEN YEAR(`DATE`) = year(CURRENT_DATE()) THEN `CURRENT_INVENTORY` ELSE 0 END)
+
SUM(CASE WHEN YEAR(`DATE`) = year(CURRENT_DATE()) THEN `NONCURRENT_INVENTORY` ELSE 0 END)
+
SUM(CASE WHEN YEAR(`DATE`) = year(CURRENT_DATE()) THEN `OLD_INVENTORY` ELSE 0 END)
```
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• Coach
edited July 2022

@ozarkram You cannot have multiple fields inside the same SUM() function. Try changing to this:

```CASE WHEN YEAR(`DATE`) = year(CURRENT_DATE())
THEN `CURRENT_INVENTORY` + `NONCURRENT_INVENTORY` + `OLD_INVENTORY`
END
```

• Thank you so much @GrantSmith and @MichelleH ..Really appreciate your help!

• Coach

@ozarkram - I think that @GrantSmith 's approach is a better option here. He has included safeguards for any null values. If you choose @MichelleH's solution you will get a null value if any of the three fields are null.

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