# RowCountMatch


Checks the ratio of the row count of the primary dataset and the row count of a reference dataset against the given expression.

**Syntax**

```
RowCountMatch <REFERENCE_DATASET_ALIAS> <EXPRESSION>
```
+ **REFERENCE\$1DATASET\$1ALIAS** – The alias of the reference dataset against which to compare row counts.

  **Supported column types**: Byte, Decimal, Double, Float, Integer, Long, Short
+ **EXPRESSION** – An expression to run against the rule type response in order to produce a Boolean value. For more information, see [Expressions](dqdl.md#dqdl-syntax-rule-expressions).

**Example: Row count check against a reference dataset**

The following example rule checks whether the row count of the primary dataset is at least 90% of the row count of the reference dataset.

```
RowCountMatch "reference" >= 0.9
```