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考虑一个保存带有时间戳的记录start的表。任何人都可以提出一个 SQL 语句来计算表中所有时间间隔（从到）end的联合秒数吗？请注意：时间间隔可能有重叠！startend
start
end
我想做这样的事情（来源 - CSS技巧文章）：
#veinte { color/*\**/: blue\9; }