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help / color / mirror / Atom feedFrom: Shaozhong SHI <[email protected]>
To: Marcos Pegoraro <[email protected]>
Cc: pgsql-sql <[email protected]>
Subject: Re: Change detection
Date: Fri, 9 Dec 2022 13:14:15 +0000
Message-ID: <CA+i5JwZiEUgZZBqq04YQ1jBh=d7TBA_MFGC8R9yg66x_pwZQbg@mail.gmail.com> (raw)
In-Reply-To: <CAB-JLwZCEZNs_2jpd1UxRhC1=L3X0VeubokhQ5QBvhz3RckcZA@mail.gmail.com>
References: <CA+i5JwZ+XmOF6P4Lo=UTVUJBSQN4EyQL-fe7t4XTLPB9bwq9aQ@mail.gmail.com>
<CAB-JLwZCEZNs_2jpd1UxRhC1=L3X0VeubokhQ5QBvhz3RckcZA@mail.gmail.com>
Thanks, Marcos. It worked well. Regards, David
On Fri, 9 Dec 2022 at 13:06, Marcos Pegoraro <[email protected]> wrote:
> Data
>>
>> Staff_ID Name Department Year
>> 1 Tom Sales 1990
>> 2 Tom Sales 1991
>> 3 Tom Sales 1991
>> 4 Tom Management 1992
>> 4 Tom Management 1992
>>
>> select *, coalesce(lag(department) over(order by year), department) <>
> department Changed from (Values (1, 'Tom', 'Sales', 1990),(2, 'Tom',
> 'Sales', 1991),(3, 'Tom', 'Sales', 1991),(4, 'Tom', 'Management', 1992),(4,
> 'Tom', 'Management', 1992)) as x(Staff_ID, Name, Department, Year);
> staff_id | name | department | year | changed
> ----------+------+------------+------+---------
> 1 | Tom | Sales | 1990 | f
> 2 | Tom | Sales | 1991 | f
> 3 | Tom | Sales | 1991 | f
> 4 | Tom | Management | 1992 | t
> 4 | Tom | Management | 1992 | f
> (5 rows)
>
>
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Subject: Re: Change detection
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