更新时间:2023-02-07 08:48:17
ROW_NUMBER
可以提供帮助.它需要一个 order-by 子句,但这是可以的,因为存在一个 order-by(并且需要保证特定的订单).
This is where ROW_NUMBER
can help. It requires an order-by clause but this is okay because an order-by is present (and required to guarantee a particular order).
SELECT t.id, t.key
FROM
(
SELECT id, key, ROW_NUMBER() OVER (ORDER BY key) AS rownum
FROM datatable
) AS t
WHERE t.rownum % 30 = 0 -- or % 40 etc
ORDER BY t.key