Unique constraint on field inside composite type.

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От Silk Parrot
Тема Unique constraint on field inside composite type.
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Msg-id etPan.57b54f92.50d1bedf.fb4d@gmail.com
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Ответы Re: Unique constraint on field inside composite type.
Re: Unique constraint on field inside composite type.
Re: Unique constraint on field inside composite type.
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Hi,

    I am trying to model a social login application. The application can support multiple login providers. I am thinking of creating a custom type for each provider. e.g.

CREATE TYPE system.google_user AS (
   email TEXT
);

CREATE TYPE system.facebook_user AS (
   id TEXT
);

   And having user table like:

CREATE TABLE user (
    uuid UUID PRIMARY KEY DEFAULT public.uuid_generate_v4(),
    google_user system.google_user,
    facebook_user system.facebook_user,
    UNIQUE (google_user.email)
);

However, the above create table query reports syntax error:

ERROR:  syntax error at or near "."
LINE 10:     UNIQUE (google_user.email)

Is there a way to create unique constraint on a field inside composite type?

-- 
Regards
Ryan

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