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38 lines
837 B
Markdown
38 lines
837 B
Markdown
---
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slug: /en/sql-reference/aggregate-functions/reference/aggthrow
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sidebar_position: 101
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---
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# aggThrow
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This function can be used for the purpose of testing exception safety. It will throw an exception on creation with the specified probability.
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**Syntax**
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```sql
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aggThrow(throw_prob)
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```
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**Arguments**
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- `throw_prob` — Probability to throw on creation. [Float64](../../data-types/float.md).
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**Returned value**
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- An exception: `Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully`.
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**Example**
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Query:
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```sql
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SELECT number % 2 AS even, aggThrow(number) FROM numbers(10) GROUP BY even;
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```
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Result:
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```response
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Received exception:
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Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully: While executing AggregatingTransform. (AGGREGATE_FUNCTION_THROW)
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```
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