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Socket.io rooms difference between broadcast.to and sockets.in
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in none. Different name for same thing.
– mike_hornbeck
Jun 18 '13 at 14:56
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@UniqueConstraint and @Column(unique = true) in hibernate annotation
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As said before, @Column(unique = true) is a shortcut to UniqueConstraint when it is only a single field.
From the example you gave, there is a huge difference between both.
@Column(unique = true)
@ManyToOne(optional = false, fetch = ...
Index on multiple columns in Ruby on Rails
...at the beginning. i.e. if you index on [:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id]
Question regarding 'unique' ...
Change default text in input type=“file”?
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Personally, because most users stick to their browser of choice, and therefore are probably used to seeing the control in the default rendition, they'd probably get confused if they saw something different (depending on the types of users you're dealing with).
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CHECK constraint in MySQL is not working
...rigger...
mysql> delimiter //
mysql> CREATE TRIGGER trig_sd_check BEFORE INSERT ON Customer
-> FOR EACH ROW
-> BEGIN
-> IF NEW.SD<0 THEN
-> SET NEW.SD=0;
-> END IF;
-> END
-> //
mysql> delimiter ;
Hope that helps.
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How do I display an alert dialog on Android?
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You could use an AlertDialog for this and construct one using its Builder class. The example below uses the default constructor that only takes in a Context since the dialog will inherit the proper theme from the Context you pass in, but there's also a c...
Select top 10 records for each category
...es then you may return more than 10 rows and Matt's solution may be better for you.
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SQL Group By with an Order By
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Although OP is using MySQL, this answer also worked for me in HSQL (Libreoffice built-in)
– Arno Teigseth
Nov 17 '15 at 2:39
add a comment
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Espresso: Thread.sleep( );
Espresso claims that there is no need for Thread.sleep(); , but my code doesn't work unless I include it. I am connecting to an IP. While connecting, a progress dialog is shown. I need a sleep to wait for the dialog to dismiss. This is my test snippet where I use it:
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How can I do width = 100% - 100px in CSS?
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I found when I was using calc(100% - 6px) for example it was displaying as calc(94%), I had to escape it as follows and now it works width: calc(~"100% - 6px");
– nsilva
Apr 19 '16 at 12:53
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