Sum 41 Deryck Whibley Hospitalized With Pneumonia Says Wife We Spent The Entire Night In The Er 's Rushed To Hospital And 'heart

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总结 sql 中的两种使用场景：`sum (case when )` 和 `case when sum ()`，帮助理解它们在数据查询中的差异。通常在 sql 查询中，`sum (case when )` 用于根据特定条件对.

'We Spent the Entire Night in the ER' Sum 41's Deryck Whibley