extract | 易学教程

Extract Month From Date Field

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问题 I have a date field in a postgresql database (field name is input) how can I extract the month only from the date field? I used the syntax below, but I want it to show the actual month name, not a numeric value for the month EXTRACT(MONTH FROM input) AS "Month" So if the date in the field input was 04/26/2016 this syntax returns 4, how could I alter this to return April 回答1: You may find this useful SELECT to_char(to_timestamp (date_part('month', timestamp '2016-04-26 20:38:40')::text, 'MM'),

Extract specific file extensions from multiple 7-zip files

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问题 I have a RAR file and a ZIP file. Within these two there is a folder. Inside the folder there are several 7-zip (.7z) files. Inside every 7z there are multiple files with the same extension, but whose names vary. RAR or ZIP file |___folder |_____Multiple 7z |_____Multiple files with same extension and different name I want to extract just the ones I need from thousands of files... I need those files whose names include a certain substring. For example, if the name of a compressed file

Extract specific file extensions from multiple 7-zip files

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Can't get text from another application (window)

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问题 I am trying to extract text from another application. This application may for now be whatever simple, I just want it to work (for now). The code I use: public static class ModApi { [DllImport("user32.dll", EntryPoint = "SendMessageTimeout", SetLastError = true, CharSet = CharSet.Unicode)] public static extern uint SendMessageTimeoutText(IntPtr hWnd, int Msg, int countOfChars, StringBuilder text, uint flags, uint uTimeoutj, uint result); public static string GetText(IntPtr hwnd) { var text =

Extracting individual digits from a float

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问题 I have been banging my head on this one all day. The C++ project I am currently working on has a requirement to display an editable value. The currently selected digit displays the incremented value above and decremented value below for said digit. It is useful to be able to reference the editable value as both a number and collection of digits. What would be awesome is if there was some indexable form of a floating point number, but I have been unable to find such a solution. I am throwing

Making a basic web scraper in Python with only built in libraries - Python

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问题 Learning Python, I'm trying to make a web scraper without any 3rd party libraries, so that the process isn't simplified for me, and I know what I am doing. I looked through several online resources, but all of which have left me confused about certain things. The html looks something like this, <html> <head>...</head> <body> *lots of other <div> tags* <div class = "want" style="font-family:verdana;font-size:12px;letter-spacing:normal""> <form class ="subform">...</form> <div class = "subdiv1"

What would be the best way to extract square meters from a string that also mentions the amount of bedrooms?

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问题 I'm trying to extract: <div class="xl-surface-ch"> 84 m² 2 bed. </div> from link the problem is, I only need the "84" in this string (they sometimes go over 2 or 3 digits as well). Added difficulty is that sometimes the square meters are not mentioned, which looks like this: <div class="xl-surface-ch"> 2 bed. </div> and in that case I'd need to return a 0 My best attempt is: sqm = [] for item in soup.findAll('div', attrs={'class': 'xl-surface-ch'}): item = item.contents[0].strip()[0:4]

Extract text from caret position textarea

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问题 I am having trouble to extract text from textarea using WPF code behind. Example: Sunny day in London if the cursor is set on [d*ay] it should return day. * for the cursor. Any help will be appreciated. 回答1: This seems to work but I am not sure how you want it to behave when the caret is in the middle of whitespace. As is, it basically returns the nearest token that is touching the caret. For example, the phrase "Sunny day in London" has four tokens: "Sunny", "day", "in", and "London". string

JSON to SQL - Extracting from JSON Array?

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问题 I have an exercise to extract some data from a larger JSON object however the data is added as multiple objects or perhaps an array of sorts. An example below; DECLARE @json NVARCHAR(MAX) = '{ "N.data.-ce731645-e4ef-4784-bc02-bb90b4c9e9e6": "Some Data", "N.data.sessionDates-7f1790d3-9175-43aa-962b-161ee3b8615f": [ { "date_1": "2018-10-20T23:00:00.000Z" }, { "date_1": "2018-10-21T23:00:00.000Z" } ] }' I need to extract these datetime entries from the "date_1" identifier into ideally a CSV list

How to extract result from lme() function from multiple groups and then combine in R?

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问题 First, the following data are split randomly into two groups according to the sl variable and then run the model for both groups using the for loop shown below the data set mydata y x sl 1 5.297967 1 1 2 3.322833 2 1 3 4.969813 3 1 4 4.276666 4 1 5 5.972807 1 2 6 6.619440 2 2 7 8.045588 3 2 8 7.377759 4 2 9 6.907755 5 2 10 8.672486 6 2 11 8.283999 7 2 12 8.455318 8 2 13 7.414573 9 2 14 8.634087 10 2 15 7.356355 1 3 16 6.606247 2 3 17 6.396930 9 3 18 6.579251 10 3 19 5.521110 1 4 20 2.224221 2