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Count table rows
...r when I use name of indexed column instead of * ? Like this: SELECT COUNT(id) FROM tablename
– user1810543
Nov 8 '12 at 21:01
1
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await vs Task.Wait - Deadlock?
... edited Feb 13 at 11:40
David Ferenczy Rogožan
16.7k88 gold badges6262 silver badges6363 bronze badges
answered Dec 6 '18 at 13:52
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How to perform OR condition in django queryset?
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Can the order_by() be applied to each individual queryset and then combined? So that the order for each condition is still maintained? For example, combined_queryset= User.objects.filter(income__gte=5000).order_by('income') | User.objects.filter(income__lt=5000).order...
How to unbind a listener that is calling event.preventDefault() (using jQuery)?
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The link you provided is broken.
– Stacked
Sep 8 '16 at 9:04
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Can you split a stream into two streams?
...ing looks like this:
Random r = new Random();
Map<Boolean, List<String>> groups = stream
.collect(Collectors.partitioningBy(x -> r.nextBoolean()));
System.out.println(groups.get(false).size());
System.out.println(groups.get(true).size());
For more categories, use a Collec...
Why is Swift compile time so slow?
...ictionary
dic.addEntriesFromDictionary([
"url" : self.url?.absoluteString ?? "",
"title" : self.title ?? ""
])
return dic.copy() as NSDictionary
because the property title was of type var title:String? and not NSString. The compiler was going crazy when adding it to the NS...
Why is textarea filled with mysterious white spaces?
... @user79685 you're welcome. Read my new comment above, I wasn't really ridiculing you. At least not in a mean way :)
– Pekka
Feb 4 '10 at 20:52
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HTML if image is not found
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The best way to solve your problem:
<img id="currentPhoto" src="SomeImage.jpg" onerror="this.onerror=null; this.src='Default.jpg'" alt="" width="100" height="120">
onerror is a good thing for you :)
Just change the image file name and try yourself.
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400 BAD request HTTP error code meaning?
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Keep in mind that client developer may do strange things and try to parse strings which you return as human readable description. And by changing the strings you will break such badly written clients. So always provide machine readable description and try to avoid reporting additional information i...
How to update attributes without validation
I've got a model with its validations, and I found out that I can't update an attribute without validating the object before.
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