大约有 1,500 项符合查询结果(耗时:0.0174秒) [XML]

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Copy a table from one database to another in Postgres

...1 database1 \ -c "copy (select field1,field2 from table1) to stdout with csv" ) \ | ( export PGPASSWORD=password2 psql -U user2 -h host2 database2 \ -c "copy table2 (field1, field2) from stdin csv" ) share ...
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On Duplicate Key Update same as insert

... wont this would slow the process on large datasets and like importing csv's with 100K or more rows? – Muhammad Omer Aslam May 14 at 17:45 add a comment ...
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从网购到火车票,对比淘宝12306网为何如此烂? - 大数据 & AI - 清泛网 - ...

...级”还那么弱不禁风。 冯大辉的微博马上得到了@caoz的发响应,后者在9月底对12306的骂战中一战成名,由于观点相似,caoz和Fenng可以称为统一战线——当然,众多对12306充满怨恨的普通购票者也与他们在感情上统一战线。 简...
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浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术

...255,所以 unsigned char 的范围为0~ 255,在这里普及一下2进制十进制的方法, 二进制每一位的数值乘以它的位权(2^(n-1),n为自右向左的位),再相加,可得到十进制数,比如 : 1111 1111 =1*2^7+1*2^6+1*2^5+1*2^4+1*2^3+1*2^2+1*2^1+1*2^0=127 。 但...
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rsync copy over only certain types of files using include option

...d on: https://stackoverflow.com/a/11111793/588867 # Example: selrsync 'tsv,csv' ./source ./target --dry-run types="$1"; shift; #accepts comma separated list of types. Must be the first argument. includes=$(echo $types| awk -F',' \ 'BEGIN{OFS=" ";} { for (i = 1; i <= NF; i++ ) { if (l...
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How can I remove the first line of a text file using bash/sed script?

...ink the OP is trying to achieve what made me find this question. I have 10 CSV files with 500k lines in each. Every file has the same header row as the first line. I am cat:ing these files into one file and then importing them into a DB letting the DB create column names from the first line. Obvious...
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How to deal with SettingWithCopyWarning in Pandas?

...ig file with lots of columns, then modifying it to be smaller. The pd.read_csv function can help you out with a lot of this and also make the loading of the file a lot faster. So instead of doing this quote_df = pd.read_csv(StringIO(str_of_all), sep=',', names=list('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefg...
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融资千万美元后的足记要如何应对“爆款后遗症”? - 资讯 - 清泛网 - 专注C...

...露,光源资本是足记一直以来的财务顾问,此次是用佣金股的方式进入的。 “这个投资本来今年三月底就已经敲定了。但由于我们引入的是美元基金,手续比较长,比如建设海外VIE架构等,到公布前一周才完成大体的手续。...
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半年报披露 天涯社区被资本方看空 - 资讯 - 清泛网 - 专注C/C++及内核技术

...015年半年度报告,自2015年9月1日起按照有关规定暂停股票让。但9月1日,天涯社区就披露了半年报告。这家受到高度关注的老牌互联网企业,在资本市场上,似乎还有很长的路要走。几乎没有一家公司像天涯社区一样得到如此...
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BLE(四)嗅探工具 - 创客硬件开发 - 清泛IT社区,为创新赋能!

...进而确定“访问地址”、“循环冗余校验”初始值、“跳间隔”、“跳增量”等,并还原出数据包的值 缺点: 说是支持“传统蓝牙”,但其实只能捕获“基本速率蓝牙”在网络中的活动,并不支持后来的“增强速率蓝牙...