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## countWhere Method
The countWhere method returns the number of rows that match specified criteria in a specified table.

### Syntax
````javascript
async countWhere(tableName, criteria = {})
````
### Parameters
* tableName (String): The name of the table to count rows from.
* criteria (Object): An optional object specifying the criteria for filtering the rows. Defaults to an empty object {}.
### Returns
* The number of rows that match the criteria.
### Example
````javascript
const matchingRows = await db.countWhere('tableName', { column: 'value' });
console.log(matchingRows);
````