1.
SELECT
COUNT(CASE WHEN hanbai_tanka <= 1000 THEN hanbai_tanka ELSE NULL END) AS low_price, COUNT(CASE WHEN hanbai_tanka <
SELECT
COUNT(CASE WHEN hanbai_tanka <= 1000 THEN hanbai_tanka ELSE NULL END) AS low_price, COUNT(CASE WHEN hanbai_tanka <
阅读背景：
这两种写法有什么不同吗？书上答案推荐第二种
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