> ## Documentation Index
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# avgIf

> Example of using the avgIf combinator

<h2 id="description">
  Description
</h2>

The [`If`](/reference/functions/aggregate-functions/combinators#-if) combinator can be applied to the [`avg`](/reference/functions/aggregate-functions/avg)
function to calculate the arithmetic mean of values for rows where the condition is true,
using the `avgIf` aggregate combinator function.

<h2 id="example-usage">
  Example usage
</h2>

In this example, we'll create a table that stores sales data with success flags,
and we'll use `avgIf` to calculate the average sale amount for successful transactions.

```sql title="Query" theme={null}
CREATE TABLE sales(
    transaction_id UInt32,
    amount Decimal(10,2),
    is_successful UInt8
) ENGINE = MergeTree
ORDER BY ();

INSERT INTO sales VALUES
    (1, 100.50, 1),
    (2, 200.75, 1),
    (3, 150.25, 0),
    (4, 300.00, 1),
    (5, 250.50, 0),
    (6, 175.25, 1);

SELECT
    avgIf(amount, is_successful = 1) AS avg_successful_sale
FROM sales;
```

The `avgIf` function will calculate the average amount only for rows where `is_successful = 1`.
In this case, it will average the amounts: 100.50, 200.75, 300.00, and 175.25.

```response title="Response" theme={null}
   ┌─avg_successful_sale─┐
1. │              193.88 │
   └─────────────────────┘
```

<h2 id="see-also">
  See also
</h2>

* [`avg`](/reference/functions/aggregate-functions/avg)
* [`If combinator`](/reference/functions/aggregate-functions/combinators#-if)