大约有 47,000 项符合查询结果(耗时:0.0306秒) [XML]

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How to use DISTINCT and ORDER BY in same SELECT statement?

..., and use a GROUP BY to make the DISTINCT work. Try something like this: SELECT DISTINCT Category, MAX(CreationDate) FROM MonitoringJob GROUP BY Category ORDER BY MAX(CreationDate) DESC, Category share | ...
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How to map and remove nil values in Ruby

...blem: N = 1_00_000 enum = 1.upto(1_000) Benchmark.bmbm do |x| x.report("select + map") { N.times { enum.select { |i| i.even? }.map{|i| i + 1} } } x.report("map + compact") { N.times { enum.map { |i| i + 1 if i.even? }.compact } } x.report("filter_map") { N.times { enum.filter_map { |i| i ...
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Select tableview row programmatically

How do I programmatically select a UITableView row so that 7 Answers 7 ...
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Vim search and replace selected text

Let's say we have a text, and I enter visual mode and select some text. How do I quickly do a search for the highlighted text and replace it with something else? ...
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How to get Time from DateTime format in SQL?

... SQL Server 2008: SELECT cast(AttDate as time) [time] FROM yourtable Earlier versions: SELECT convert(char(5), AttDate, 108) [time] FROM yourtable share |...
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Is it possible to center text in select box?

...you could style the dropdown: https://www.filamentgroup.com/lab/jquery-ui-selectmenu-an-aria-accessible-plugin-for-styling-a-html-select.html This plugin hides the select element, and creates span elements etc on the fly to display a custom drop down list style. I'm quite confident you'd be able t...
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DISTINCT for only one column

... If you are using SQL Server 2005 or above use this: SELECT * FROM ( SELECT ID, Email, ProductName, ProductModel, ROW_NUMBER() OVER(PARTITION BY Email ORDER BY ...
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Find rows with multiple duplicate fields with Active Record, Rails & Postgres

... Tested & Working Version User.select(:first,:email).group(:first,:email).having("count(*) > 1") Also, this is a little unrelated but handy. If you want to see how times each combination was found, put .size at the end: User.select(:first,:email).gro...
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Grouped LIMIT in PostgreSQL: show the first N rows for each group?

... New solution (PostgreSQL 8.4) SELECT * FROM ( SELECT ROW_NUMBER() OVER (PARTITION BY section_id ORDER BY name) AS r, t.* FROM xxx t) x WHERE x.r <= 2; sha...
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How to change Android Studio's editor font?

...TRL + mouse wheel which is really easy to use it !!! To use this feature select File -> Settings -> Editor -> General -> select the checkbox of Change the font size (Zoom) with Ctrl + Mouse Wheel I hope it's helpful. ...