From: | Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> |
---|---|
To: | Ken Tanzer <ken(dot)tanzer(at)gmail(dot)com>, PG-General Mailing List <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Immutable way to cast timestamp TEXT to DATE? (for index) |
Date: | 2019-01-04 22:27:02 |
Message-ID: | 85d0c08f-64ea-b980-a6cd-425b97159c8d@aklaver.com |
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Lists: | pgsql-general |
On 1/4/19 2:21 PM, Ken Tanzer wrote:
> Hi. I've got a text field in a table that holds this style of timestamp:
>
> 2014-10-23T00:00:00
>
> I'd like to be able to create an index on the date portion of this field
> (as a date), because I have lots of queries that are searching for
> particular dates or ranges.
>
> I've tried various ways of getting to a date (::date, LEFT(x,10)::date,
> etc.), but all of them throw the error "functions in index expression
> must be marked IMMUTABLE."
?:
'2014-10-23T00:00:00'::timestamp
Can you also show the actual index expression?
>
> Is there any way, hacky or otherwise, people know of to do this? Thanks
> in advance.
>
> Ken
>
>
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Adrian Klaver
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