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From: David G. Johnston <[email protected]>
To: Rich Shepard <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: Accommodating alternative column values
Date: Wed, 3 Jul 2024 07:23:00 -0700
Message-ID: <CAKFQuwYmt-UmO_WaqZ-mhS+nBEm35kKy_CyCSu6Zqpam4ypxcQ@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Wed, Jul 3, 2024 at 7:13 AM Rich Shepard <[email protected]>
wrote:

> On Wed, 3 Jul 2024, David G. Johnston wrote:
>
> > Yeah, the simply cast suggested will not work. You’d have to apply an
> > expression that turns the current contents into an array. The current
> > contents are not likely to be an array literal.
>
> David,
>
> No, it's not now an array.
>
> I thought that this expression would work, but it doesn't:
> bustrac=# alter table people alter column email set data type
> varchar(64)[] using email::varchar(64)[];
> RROR:  malformed array literal: "[email protected]"
> DETAIL:  Array value must start with "{" or dimension information.
>
> If I correctly understand the error detail I'd need to change the contents
> of that column for all 1280 rows to enclose the contents in curly braces
> before I can convert the datatype to an array. Is that correct?
>
>
Assuming today there is only one email per row, no, see Torsten's reply.

You also wouldn't need to perform an update..."using ('{' || email ||
'}')::text[]" if just doing that...

David J.

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