# lower

```ts
function lower<T>(arg): WithAggregate<StringFunctionReturnType<T>, T>;
```

Defined in: [packages/db/src/query/builder/functions.ts:370](https://github.com/TanStack/db/blob/main/packages/db/src/query/builder/functions.ts#L370)

## Type Parameters

### T

`T` *extends* `ExpressionLike`

## Parameters

### arg

`T`

## Returns

`WithAggregate`\<`StringFunctionReturnType`\<`T`\>, `T`\>