目录直接update的弊端方法一；replace into方法二：insert into [table] values… on duplicate key update方法三：创建临时表总结直接update的弊端
I have a bitmap and would like to return an iterator of positions of set bits. Right now I just walk the whole bitmap and if bit is set, then I pr开发者_开发问答ovide next position. I believe this cou
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