| 一開始我其實不太了解 |
| ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING |
| 表達的是什麼? |
| 照字面上解釋,前一後一嘛!! |
| 先看結果 |
| 加了array_agg的呈現 |
| window 是可以用別名簡化的 |
| 程式碼看起來會精簡很多 |
用array_agg 來看slide window 的運作
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