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Very Newbie Question
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I have this SQL that is not working:

```
sqlite> select 00 AS A1, 0 AS A2, A1 + A2 AS TA;
Error: no such column: A1
```

This one works,

```
sqlite> select 00 AS A1, 0 AS A2;
A1|A2
0|0
```

I know it's easy, but I want to be able to add A1 and A2, but I can't seem to find a way.  Thanks.

josé