MySQL SELECT increment counter

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有刺的猬
有刺的猬 2020-11-27 03:31

Here is my MySQL query:

SELECT name FROM table;

How can I also select an increment counter alongside name? Expected output:

3条回答
  •  暗喜
    暗喜 (楼主)
    2020-11-27 04:23

    In MySQL 8 and above you can also use the ROW_NUMBER() Window function.

    SELECT
        name,
        ROW_NUMBER() OVER ()
    FROM table
    

    Result:

    Jay  1
    roy  2
    ravi 3
    ram  4
    

    As shown by juergen d, it would be a good idea to put an ORDER BY to have a deterministic query.

    The ORDER BY can apply to the query and the counter independently. So:

    SELECT
        name,
        ROW_NUMBER() OVER (ORDER BY name DESC)
    FROM table
    ORDER BY name
    

    would give you a counter in decreasing order.

    Result:

    Jay  4
    ram  3
    ravi 2
    roy  1
    

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