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Hello and welcome to our comprehensive guide to SQL Server Sum! If you’re new to SQL Server or just looking to refresh your knowledge, you’ve come to the right place. In this article, we’ll cover everything you need to know about the SQL Server Sum function, from basic syntax to advanced queries.

## What is SQL Server Sum?

The SQL Server Sum function is a built-in function that allows you to calculate the sum of a set of values in a column. It is commonly used in SQL queries to perform aggregate calculations, such as finding the total revenue for a certain period of time, or calculating the average score for a group of students.

In its simplest form, the Sum function takes one argument: the name of the column you want to sum. For example, the following query would return the total revenue for all sales:

OrderDate | Product | Price |
---|---|---|

2019-01-01 | Widget A | 10.00 |

2019-01-02 | Widget B | 20.00 |

2019-01-03 | Widget A | 15.00 |

2019-01-04 | Widget C | 25.00 |

`SELECT SUM(Price) FROM Sales`

### How does SQL Server Sum work?

When you use the Sum function in a query, SQL Server looks at each row in the specified column and adds up the values. The result is a single value that represents the sum of all the values in the column.

If there are any null values in the column, SQL Server will ignore them when calculating the sum. If you want to include null values in the sum, you can use the Coalesce function to replace them with a default value.

### SQL Server Sum Syntax

The basic syntax for the Sum function is as follows:

`SUM(column_name)`

Where `column_name`

is the name of the column you want to sum.

You can also use the Sum function with the Group By clause to perform aggregate calculations on groups of rows. For example, the following query would return the total revenue for each product:

`SELECT Product, SUM(Price) FROM Sales GROUP BY Product`

## SQL Server Sum Examples

Let’s look at some more examples to see how the Sum function can be used in different scenarios.

### Example 1: Summing a Single Column

The most basic use of the Sum function is to sum a single column of values. In the following example, we’ll use a table of sales data to calculate the total revenue:

OrderDate | Product | Price |
---|---|---|

2019-01-01 | Widget A | 10.00 |

2019-01-02 | Widget B | 20.00 |

2019-01-03 | Widget A | 15.00 |

2019-01-04 | Widget C | 25.00 |

`SELECT SUM(Price) FROM Sales`

The result of this query would be `70.00`

, which is the sum of all the prices in the `Price`

column.

### Example 2: Summing Multiple Columns

In some cases, you may want to sum multiple columns. For example, you might have a table of sales data that includes both revenue and expenses, and you want to calculate the net profit. In this case, you can use the Sum function with the Plus operator (+) to sum the two columns:

OrderDate | Product | Revenue | Expenses |
---|---|---|---|

2019-01-01 | Widget A | 10.00 | 5.00 |

2019-01-02 | Widget B | 20.00 | 10.00 |

2019-01-03 | Widget A | 15.00 | 7.50 |

2019-01-04 | Widget C | 25.00 | 12.50 |

`SELECT SUM(Revenue + Expenses) AS NetProfit FROM Sales`

The result of this query would be `50.00`

, which is the sum of the `Revenue`

and `Expenses`

columns.

### Example 3: Summing Groups

Another common use of the Sum function is to sum groups of rows based on a common attribute. For example, you might have a table of sales data for multiple stores, and you want to calculate the total revenue for each store. In this case, you can use the Group By clause to group the rows by store, and then use the Sum function to calculate the sum for each group:

Store | Product | Price |
---|---|---|

Store A | Widget A | 10.00 |

Store A | Widget B | 20.00 |

Store B | Widget A | 15.00 |

Store B | Widget C | 25.00 |

`SELECT Store, SUM(Price) FROM Sales GROUP BY Store`

The result of this query would be:

Store | Sum |
---|---|

Store A | 30.00 |

Store B | 40.00 |

## FAQs

### What is the SQL Server Sum function?

The SQL Server Sum function is a built-in function that allows you to calculate the sum of a set of values in a column. It is commonly used in SQL queries to perform aggregate calculations, such as finding the total revenue for a certain period of time, or calculating the average score for a group of students.

### How do I use the SQL Server Sum function?

To use the Sum function, simply specify the name of the column you want to sum as the argument. You can also use the function with the Group By clause to perform aggregate calculations on groups of rows.

### What happens if there are null values in the column?

If there are any null values in the column, SQL Server will ignore them when calculating the sum. If you want to include null values in the sum, you can use the Coalesce function to replace them with a default value.

### Can I sum multiple columns?

Yes, you can use the Plus operator (+) to sum multiple columns. Simply include the column names separated by the operator in the Sum function.

### Can I sum groups of rows?

Yes, you can use the Group By clause to group the rows by a common attribute, and then use the Sum function to calculate the sum for each group.

### Is the SQL Server Sum function case-sensitive?

No, the Sum function is not case-sensitive. It will treat all column names as if they were written in uppercase.

## Conclusion

That’s all for our guide to the SQL Server Sum function. We hope you found it helpful and informative. Remember, the Sum function is a powerful tool for performing aggregate calculations in SQL Server, and it can be used in a variety of scenarios. If you have any further questions or comments, please feel free to leave them below. Happy querying!