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help / color / mirror / Atom feedFrom: Marcos Pegoraro <[email protected]>
To: Shaozhong SHI <[email protected]>
Cc: pgsql-sql <[email protected]>
Subject: Re: Change detection
Date: Fri, 9 Dec 2022 10:06:24 -0300
Message-ID: <CAB-JLwZCEZNs_2jpd1UxRhC1=L3X0VeubokhQ5QBvhz3RckcZA@mail.gmail.com> (raw)
In-Reply-To: <CA+i5JwZ+XmOF6P4Lo=UTVUJBSQN4EyQL-fe7t4XTLPB9bwq9aQ@mail.gmail.com>
References: <CA+i5JwZ+XmOF6P4Lo=UTVUJBSQN4EyQL-fe7t4XTLPB9bwq9aQ@mail.gmail.com>
>
> 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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To: [email protected]
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Subject: Re: Change detection
In-Reply-To: <CAB-JLwZCEZNs_2jpd1UxRhC1=L3X0VeubokhQ5QBvhz3RckcZA@mail.gmail.com>
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