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List all tables in postgresql information_schema
...
For private schema 'xxx' in postgresql :
SELECT table_name FROM information_schema.tables
WHERE table_schema = 'xxx' AND table_type = 'BASE TABLE'
Without table_type = 'BASE TABLE' , you will list tables and views
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Summarizing multiple columns with dplyr? [duplicate]
...gt; <dbl> <dbl> <dbl>
#> 1 1 3.08 2.98 2.98 2.91
#> 2 2 3.03 3.04 2.97 2.87
#> 3 3 2.85 2.95 2.95 3.06
If you want to summarize only certain columns, use summarise_at or summarise_if functions.
Alternatively, the purrrlyr package provides the same ...
How to read lines of a file in Ruby
...d "\r\n" from Windows, here's what I would do:
line_num=0
text=File.open('xxx.txt').read
text.gsub!(/\r\n?/, "\n")
text.each_line do |line|
print "#{line_num += 1} #{line}"
end
Of course this could be a bad idea on very large files since it means loading the whole file into memory.
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站长投放广告绝对不做的事:Google Adsense和百度联盟广告违规分析 - 更多技...
...内容包括但不限于翻页按钮、导航链接、视频播放窗口、在线小游戏加载）
2、可以看出，百度禁止所谓的“与正文混排”的投放广告模式，并不是像网上所流传的那样禁止将广告放在文章内页与文字“混搭”，而是要让百度...
Turn off auto formatting in Visual Studio
...swered Mar 30 '11 at 22:03
Tango91Tango91
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App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...们 关注我，不迷路 在线 客服 扫码添加客服咨询 我要 分享 扫码分享到朋友圈 顶部 var qrcode = new QRCode("qrcode", { ...
Is it possible to run a single test in MiniTest?
...(temporally) add something to the test name very unique like:
it "my test xxx" do
end
and then use the RegEx version of the '-n' parameter like:
ruby my_test.rb -n /xxx/
share
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阿里双11大型项目管理怎么玩？ - 项目管理 - 清泛网 - 专注C/C++及内核技术
...项目集的可视化、透明化的联动，最终将菜鸟的266个项目在线上实现了有序的管理和沉淀。
（点击查看清晰大图）
菜鸟项目5级分层：
第一层：菜鸟双11项目集
第二层：3个一级项目——P0-近卫军团-技术风险、P1-天灾军...
How to install Java SDK on CentOS?
...://www.oracle.com"$1}' | xargs wget --no-cookies --header "Cookie: gpw_e24=xxx; oraclelicense=accept-securebackup-cookie;" -O index.html -q && grep -Eoi '"filepath":"[^"]+jdk-8u[0-9]+-linux-x64.rpm"' index.html | grep -Eoi 'http:[^"]+' | xargs wget --no-cookies --header "Cookie: gpw_e24=xxx;...
Validate phone number with JavaScript
...econdly, your validation is incorrect. NANP numbers take the form NXX NXX XXXX where N is a digit 2-9 and X is a digit 0-9. Additionally, area codes and exchanges may not take the form N11 (end with two ones) to avoid confusion with special services except numbers in a non-geographic area code (80...