Returns the skew of a raster object along the X axis in the spatial reference system.

## Prerequisites
The raster object must have a valid spatial reference system identifier (SRID).

## Syntax
```
HELPCODEESCAPE-sql
float8 ST_SkewX(raster raster_obj)
```

## Parameters
<table> <thead> <tr> <th><b>Parameter</b></th> <th><b>Description</b></th> </tr> </thead> <tbody> <tr> <td><code>raster_obj</code></td> <td>The raster object to query.</td> </tr> </tbody> </table>

## Examples
Query the X-axis and Y-axis skew values of all rasters in a table:

```
HELPCODEESCAPE-sql
SELECT st_skewx(rast), st_skewy(rast)
FROM raster_table;
```

Output:

```
 st_skewx | st_skewy
----------+----------
      0.3 |      0.2
```