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Leslie Wen
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select distinct on (b.memid) surname, firstname, b.memid, starttime from cd.bookings as b join cd.members as mem on mem.memid = b.memid where starttime > '2012-09-01' order by b.memid, starttime;


select mems.surname, mems.firstname, mems.memid, min(bks.starttime) as starttime
from cd.bookings bks
inner join cd.members mems on
mems.memid = bks.memid
where starttime >= '2012-09-01'
group by mems.surname, mems.firstname, mems.memid
order by mems.memid;



https://pgexercises.com/questions/aggregates/nbooking.html

youtube 的翻译现在变得越来越准确了, 而且字幕跟语速匹配, 貌似是即时翻译的。很喜欢

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Angular1 与 Angular 2 的比较

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https://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-mac.html



下载 flash 文件, 然后更新。通过官网上的更新插件,更新基本上是失败的

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