Selamat!

Fungsi Window di Snowflake

Jake Roach

Field Data Engineer

Fungsi jendela

Perhitungan dilakukan pada "jendela" catatan tanpa kehilangan detail tingkat baris

Representasi visual dari keluaran fungsi jendela.

Fungsi jendela peringkat

SELECT
    workout_duration,

    RANK() OVER(
        ORDER BY workout_duration DESC
    ) AS r,

    -- Tanpa celah!
    DENSE_RANK() OVER(
        ORDER BY workout_duration DESC
    ) AS dr

FROM FITNESS.workouts;

   workout_duration  |   r   |   dr
  ------------------ | ----- | -----
         78          |   1   |   1
         71          |   2   |   2
         71          |   2   |   2

         68*         |   4*  |   3*

         67          |   5   |   4
         67          |   5   |   4
         67          |   5   |   4
         63          |   8   |   5
         61          |   9   |   6

Fungsi jendela agregasi

      m_id  |       wd     |   cb  |  num_workouts  |  total_cb  |  cb_vs_average 
     ------ | ------------ | ----- | -------------- | ---------- | ---------------
     m_192  |  2024-01-01  |  105  |        4       |     432    |      -3
     m_192  |  2024-01-03  |  156  |        4       |     432    |      48
     m_192  |  2024-01-04  |   69  |        4       |     432    |     -39
     m_192  |  2024-01-10  |  102  |        4       |     432    |      -6

     m_74   |  2024-02-10  |  374  |        3       |    1274    |     -50.67   
     m_74   |  2024-02-13  |  396  |        3       |    1274    |     -28.67
     m_74   |  2024-02-14  |  504  |        3       |    1274    |      79.33

     m_233  |  2024-03-05  |  51   |        2       |     132    |     -15
     m_233  |  2024-03-12  |  81   |        2       |     132    |      15

Selamat!

Fungsi jendela

Fungsi jendela peringkat

Fungsi jendela agregasi

Perhitungan berjalan dan bergerak

Langkah selanjutnya?

Terima kasih!