# STIsSimple (geometry Data Type)

**APPLIES TO:** SQL Server Azure SQL Database Azure Synapse Analytics (SQL DW) Parallel Data Warehouse

Returns 1 if a **geometry** instance is simple, as defined by the Open Geospatial Consortium (OGC). Returns 0 if a **geometry** instance is not simple.

## Syntax

```
.STIsSimple ( )
```

## Return Types

SQL Server return type: **bit**

CLR return type: **SqlBoolean**

## Remarks

To be simple, a **geometry** instance must meet all of the following requirements:

Each figure of the instance must not intersect itself, except at its endpoints.

No two figures of the instance can intersect each other at a point that is not in both of their boundaries.

## Examples

The following example creates a nonsimple `LineString`

instance that intersects itself and uses `STIsSimple()`

to test whether the `LineString`

is simple.

```
DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 0 2, 2 0)', 0);
SELECT @g.STIsSimple();
```

## See Also

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