# Projection Interactions

Use the `asProjection()` serialization function to specify the projection of a field in a SAQL query.

Given this data from a source query:

```json
[
    {expression: "first", alias: "foo"}
    {expression: "second", alias: "bar"}
]
```

You can bind the projection of a field in a target query.

```javascript
q = foreach q generate {{row(stepFoo.selection, [0], ["expression", "alias"]).asProjection()}};
```

After CRM Analytics evaluates the interaction, the projection becomes:

```javascript
q = foreach q generate first as 'foo';
```

To return all rows in the interaction, create this filter.

```javascript
q = foreach q generate {{row(stepFoo.selection, [], ["expression", "alias"]).asProjection()}};
```

After CRM Analytics evaluates the interaction, the filter becomes:

```javascript
q = foreach q generate first as 'foo', second as 'bar';
```