Re: Expression on an Expression alias

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От Mike Ellsworth
Тема Re: Expression on an Expression alias
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Msg-id 219951fd0804181342l1742875bl9d1ee3446a82d74f@mail.gmail.com
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Ответ на Re: Expression on an Expression alias  (Tom Lane <tgl@sss.pgh.pa.us>)
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On Fri, Apr 18, 2008 at 4:31 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> "Mike Ellsworth" <younicycle@gmail.com> writes:
>  > The *effect* I'd like is to 'reuse' FV1, ~
>
>  > SELECT
>  > fv_test.acct_val AS acct_val,
>  > fv_test.time AS time,
>  > fv_test.i AS interest_rate,
>  > FV(fv_test.acct_val,fv_test.i,fv_test.time) AS FV1,
>  > FV1 *2 AS FV2,
>  > FV1 *3 AS FV3
>  > FROM    "hrcommu"."fv_test

< The SELECT
>  expressions are notionally computed in parallel and so can't refer
>  to each other.

Thanks -now I get it.

Wish I didn't have 15,000 of these little quicksand pits to ungnarl.

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