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What is the difference between JOIN and UNION?
...er, then the data from the first table is shown in one set of column alongside the second table’s column in the same row.
Unions combine data into new rows. If two tables are “unioned” together, then the data from the first table is in one set of rows, and the data from the second table in a...
rails 3 validation on uniqueness on multiple attributes
...
In Rails 2, I would have written:
validates_uniqueness_of :zipcode, :scope => :recorded_at
In Rails 3:
validates :zipcode, :uniqueness => {:scope => :recorded_at}
For multiple attributes:
validates :zipcode, :uniqueness => {:scope => [:recor...
jQuery - checkbox enable/disable
...jquery/3.3.1/jquery.min.js"></script>
<form name="frmChkForm" id="frmChkForm">
<input type="checkbox" name="chkcc9" id="group1">Check Me <br>
<input type="checkbox" name="chk9[120]" class="group1"><br>
<input type="checkbox" name="chk9[140]" class=...
How to get the unique ID of an object which overrides hashCode()?
When a class in Java doesn't override hashCode() ,
printing an instance of this class gives a nice unique number.
10 Answ...
Replacing a fragment with another fragment inside activity group
I have a fragment inside a group activity and I want to replace it with another fragment:
12 Answers
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Difference between and
...c A() {
System.out.println("creating bean A: " + this);
}
public void setBbb(B bbb) {
System.out.println("setting A.bbb with " + bbb);
this.bbb = bbb;
}
public void setCcc(C ccc) {
System.out.println("setting A.ccc with " + ccc);
this.ccc = ccc;
}
}
With the followin...
Problems with Android Fragment back stack
I've got a massive problem with the way the android fragment backstack seems to work and would be most grateful for any help that is offered.
...
How to do 3 table JOIN in UPDATE query?
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Weird thing is however that my HeidiSQL software reports zero affected rows, although the data shows the updates were done.
– Pianoman
Feb 1 '16 at 8:06
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How to show the text on a ImageButton?
...
As you can't use android:text I recommend you to use a normal button and use one of the compound drawables. For instance:
<Button
android:id="@+id/buttonok"
android:layout_width="match_parent"
android:layout_height="wrap_content...
How to prevent buttons from submitting forms
...citly:
<button type="button">Button</button>
in order to override the default submit type. I just want to point out the reason why this happens.
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