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MySQL join with where clause
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user_category_subscriptions.category_id = categories.category_id
and user_category_subscriptions.user_id =1
See, with an inner join, putting a clause in the join or the where is equivalent. However, with an outer join, they are vastly different.
As a join condition, you specify the rows...
How do I install a module globally using npm?
I recently installed Node.js and npm module on OSX and have a problem with the settings I think:
7 Answers
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Initializing select with AngularJS and ng-repeat
... I'll give you the credit since you figured it out on your own and did the full example. Although I don't agree with your comment about ng-options being the "correct way." :) I have always used ng-options myself, but this required doing something that ng-options doesn't support, small as...
Is there a constraint that restricts my generic method to numeric types?
...ons for not implementing the feature in an interview with Bruce Eckel:
And it's not clear that the added complexity is worth the small yield that you get. If something you want to do is not directly supported in the constraint system, you can do it with a factory pattern. You could have a Matrix...
How to convert std::string to lower case?
...tion tolower() , however in the past I have had issues with this function and it is hardly ideal anyway as use with a std::string would require iterating over each character.
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Check if two lists are equal [duplicate]
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Slow and doesn't handle duplicates. [1, 1, 2] != [1, 2, 2]
– CodesInChaos
Mar 4 '14 at 15:42
1
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Do you need to close meta and link tags in HTML?
I was just reading somebody's HTML who never closed meta and link tags in the HTML head section. The code worked fine; is closing these tags optional?
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How do you cast a List of supertypes to a List of subtypes?
...er to another. However, you can cast through an intermediate wildcard type and it will be allowed (since you can cast to and from wildcard types, just with an unchecked warning):
List<TestB> variable = (List<TestB>)(List<?>) collectionOfListA;
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How to join two sets in one line without using “|”
Assume that S and T are assigned sets. Without using the join operator | , how can I find the union of the two sets? This, for example, finds the intersection:
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Is it safe to assume a GUID will always be unique?
...h. There are so many GUIDs that if you generate several trillion of them randomly, you're still more likely to get hit by a meteorite than to have even one collision (from Wikipedia). And if you aren't generating them randomly, but are e.g. using the MAC-address-and-time-stamp algorithm, then they...