我已經在virtualbox中創建了空間,所以你可以看到這個免費的55GB。 但是,當我想刪除分區2和分區5,我收到一條錯誤消息:rror deleting partition /dev/sda5: warning partition dev/sda5 is being used are you sure you want to continue,我無法做到這一點。 我試圖用sudo fdisk
類別 記錄要選擇N個記錄每一個類可以做: SELECT category, category_id, value FROM
(
SELECT category, value, row_number() OVER (PARTITION by category) as category_id
FROM myTable
)
WHERE category_id < N;
內部的