Google Data Studio, a powerful visualization tool, holds within its features an impressive array of functions, one of which is the SUM function. This powerful in-built tool provides Big Data analyzers, accountants, marketing analysts and data enthusiasts the opportunity to easily calculate the total sum of specific and numerous entities in a wide data set.

The syntax of the SUM function in Google Data Studio is exceedingly simple and user-friendly. Devoid of any complexities, it can be represented as follows:

```
markdown
SUM(X)
```

In the syntax, X represents a numeric field or expression that you need the total sum of. One noteworthy point is that X cannot be an aggregated field or result from an aggregation function.

Now, let us delve into how this function actually works. The SUM function returns the sum of all values in any given set of numbers. It operates on rows of data, moving across each row, picking out the numbers, and aggregating the total for you.

Example 1: Imagine you are the head of a retail company and you wish to find out the total sum of sales in the last quarter. You have data from three months, each with different sales figures. Let's call these sales_fig1, sales_fig2, and sales_fig3.

```
markdown
|Month| Number of Sales|
|:-:|::|
|January| 500 |
|February| 650 |
|March| 700 |
```

To find the total sum of sales for the first quarter, you would implement the SUM function on the "Number of Sales" column.

```
markdown
SUM(Number of Sales)
```

The SUM function churns through the data and provides you with the total sales for the first quarter, which would be 1850.
Example 2: In another scenario, your financial consultant might want to calculate the total expenditures for the business in the past year. Typically, you have an 'Expenditure' column in your company's financial record, and you simply need to apply the SUM function to this column as follows:

```
markdown
SUM(Expenditure)
```

Essentially flawless in its operation, the only limit of the SUM function is that it must work with a field consisting of numerical data. Any input to the SUM function must be a numeric field or expression.

THE SUM function cannot operate using an aggregated field or the result from an aggregation function.

The power of the SUM function is unleashed when working with large, complex data sets, especially when you need to calculate lengthy rows of numbers. While working in Google Data Studio, ensure that your column of interest has no NULL or non-numeric entries that might affect the SUM operation. For continuous and effortless data analysis, frequently validate and filter your data for accuracy and completeness before executing functions.

In conclusion, the SUM function is an essential tool that streamlines the often daunting task of aggregating large datasets. With a basic comprehension of its syntax and functionality, we can transform raw data into insightful, impactful metrics that contribute to the acceleration of data-driven decision making.

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