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MySQL: How to retrieve a random row or multiple random rows?

I have a MySQL database table that stores the URLs of photos. I need to pull 5 random records from the ... random rows from this result set? See Question&Answers more detail:os...

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c++ - Why infinite recursion leads to seg fault

Why infinite recursion leads to seg fault ? Why stack overflow leads to seg fault. I am looking for detailed explanation. ... main() { f(); } See Question&Answers more detail:os...

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java - Difficulties understanding the renderers mechanism of swing's JTable and JTree

Often when using JTable or JTree, user define its own cell renderer. It is very common to inherit user's component from ... it. Can any of you? See Question&Answers more detail:os...

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pip - Why is 'pip3 install netifaces' failing on Debian 10 Buster?

I setup a new Debian 10 (Buster) instance on AWS EC2, and was able to install a pip3 package that ... object has no attribute 'unescape' See Question&Answers more detail:os...

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java - Use string methods to find and count vowels in a string?

I have this problem for homework (I'm being honest, not trying to hide it at least) And I'm having problems ... of blank lines. Can anyone help? See Question&Answers more detail:os...

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postgresql - SQL INSERT without specifying columns. What happens?

Was looking through the beloved W3schools and found this page and actually learned something interesting. I didn' ... syntax even useful? See Question&Answers more detail:os...

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c++ - What am I allowed to do with a static, constexpr, in-class initialized data member?

This is probably a bit of an unusual question, in that it asks for a fuller explanation of a short answer ... you can in-class initialize it? See Question&Answers more detail:os...

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firefox - MAILTO max-length of each internet browsers?

Update: Two years before this question, a similar question was asked: Effective maximum mailto: body lengths ... same mailto length limitation. See Question&Answers more detail:os...

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sql server - SQL Query Where Column = '' returning Emoji characters 🎃 and 🍰

Ok so I have a table with three columns: Id, Key, Value I would like to delete all rows where Value ... table name really is [Imaging.ImageTag] See Question&Answers more detail:os...

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java - Registering a SQL function with JPA and Hibernate

I would like to know what's the best way to register a custom SQL function with JPA/Hibernate. Do I ... and pointers to relevant documentation? See Question&Answers more detail:os...

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c# - How to use default serialization in a custom System.Text.Json JsonConverter?

I am writing a custom System.Text.Json.JsonConverter to upgrade an old data model to a new version. I ... CanWrite property. Demo fiddle here. See Question&Answers more detail:os...

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Python's and Numpy's nan and set

I ran into an unpredicted behavior with Python's Numpy, set and NaN (not-a-number): >>> set([ ... rationality is behind the different behaviors. See Question&Answers more detail:os...

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python - "In" operator for numpy arrays?

How can I do the "in" operation on a numpy array? (Return True if an element is present in the given numpy ... a True #Not quite what I expected See Question&Answers more detail:os...

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ios - What is most common and correct practice to get a CGFloat from an NSNumber?

The working code for me is something like: NSNumber *n = @42.42; CGFloat cgf = 0; CFNumberRef cfn = ... common thing. Are there any? See Question&Answers more detail:os...

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c# - Operator ‘==’ cannot be applied to operands of type ‘char’ and ‘string’

I'm working on a self directed simple program to practice concepts I've learned thus far. My project is related to chess, ... (1-8)"); } } See Question&Answers more detail:os...

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javascript - Can't change border color of Material-UI OutlinedInput

I'm trying to change the border color of a v4.13 MaterialUI Outlined Input. However I have not gotten anything ... am unable to override it. See Question&Answers more detail:os...

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sql server - T-SQL: checking for email format

I have this scenario where I need data integrity in the physical database. For example, I have a variable of ... in T-SQL? Many thanks! See Question&Answers more detail:os...

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php - Fatal error: Call to undefined function oci_connect()

I have the next lines uncommented (in my php.ini): extension=php_oracle.dll extension=php_oci8.dll And I ... module could not be found. See Question&Answers more detail:os...

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joomla1.7 - 500 internal server error at back end - Joomla

I have installed new site in Joomla 1.7 and its working fine, but when i checked its back-end ( ... any solution. Thanks in advance. See Question&Answers more detail:os...

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javascript - TFS 2015 REST API Authentication

We are trying to invoke the TFS 2015 REST API's from a web-page using Javascript and have a challenge in ... edit TFS workitems from REST API. See Question&Answers more detail:os...

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c# - Excel CustomTaskPane with WebBrowser control - keyboard/focus issues

I am having this exact issue https://social.msdn.microsoft.com/Forums/vstudio/en-US/e417e686-032c-4324-b778 ... focus everythign should work. See Question&Answers more detail:os...

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c# - Is Stopwatch.ElapsedTicks threadsafe?

If I have a shared System.Diagnostics.Stopwatch instance, can multiple threads call shared.ElapsedTicks in a safe manner ... what it's worth) See Question&Answers more detail:os...

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How does #include work in C++?

If a library is included in a class header and then this header is included in another class do I have to ... "someLibrary.h" in class B? See Question&Answers more detail:os...

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asp.net - IMG SRC tags and JavaScript

Is it possible to call a JavaScript function from the IMG SRC tag to get an image url? Like this: <IMG SRC=" ... This is using .NET 2.0. See Question&Answers more detail:os...

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c++ - Possible memory leak without a virtual destructor?

#include <iostream> using namespace std; class base { int a; public: base() {a =0;} }; class derv :public ... only base part of derv object?? See Question&Answers more detail:os...

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.net - Convert String^ in c# to CString in c++/CLI

I need a help on one question where I stuck while coding my app in MFC. I am using CLR i.e Common Language ... on this. Thank you in advance. See Question&Answers more detail:os...

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jQuery-Select list option hover

I want to alert an option when the mouse-cursor is over it. I use this code: $("select > option").hover( ... Can someone give me a hint please? See Question&Answers more detail:os...

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Calculate difference between 2 dates in SQL, excluding weekend days

I would like to build an SQL query which calculates the difference between 2 dates, without counting the ... - creation_dttm from the_table See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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