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MySQL Cannot drop index needed in a foreign key constraint
...n key might not be as obvious. To find all foreign keys related to a table and column, you can use this query: dba.stackexchange.com/questions/102371/…
– charlax
Jun 12 '19 at 14:54
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How to add column if not exists on PostgreSQL?
...t pass these as parameters, you'll need to do variable substitution in the string on the client side, but this is a self contained query that only emits a message if the column already exists, adds if it doesn't and will continue to fail on other errors (like an invalid data type).
I don't recommend...
How do you search for files containing DOS line endings (CRLF) with grep on Linux?
...Ctrl+V, Ctrl+M to enter a literal Carriage Return character into your grep string. So:
grep -IUr --color "^M"
will work - if the ^M there is a literal CR that you input as I suggested.
If you want the list of files, you want to add the -l option as well.
Explanation
-I ignore binary files
-U preve...
Copying a HashMap in Java
...til.HashMap;
public class CloneHashMap {
public static void main(String a[]) {
HashMap hashMap = new HashMap();
HashMap hashMap1 = new HashMap();
hashMap.put(1, "One");
hashMap.put(2, "Two");
hashMap.put(3, "Three");
System.out.pr...
KnockOutJS - Multiple ViewModels in a single View
I'm thinking that my application is getting quite large now, too large to handle each View with a single ViewModel.
5 Answe...
How to split data into training/testing sets using sample function
I've just started using R and I'm not sure how to incorporate my dataset with the following sample code:
23 Answers
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How may I align text to the left and text to the right in the same line?
How can I align text so that some of it aligns to the left and some of it aligns to the right within the same line?
9 Answe...
Programmatically open Maps app in iOS 6
...ion map item. I haven't tried that.
Finally, if you have an address (as a string) that you want directions to, use the geocoder to create an MKPlacemark, by way of CLPlacemark.
// Check for iOS 6
Class mapItemClass = [MKMapItem class];
if (mapItemClass && [mapItemClass respondsToSelector:@...
LINQ Join with Multiple Conditions in On Clause
... That seems like a non obvious way to do that. I'm not sure I would understand what it's suppose to do.
– svick
Oct 5 '11 at 16:52
1
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How to upgrade PowerShell version from 2.0 to 3.0
The OS that I am using is Windows 7, and the PowerShell version that is installed here is 2.0. Is it possible for me to upgrade it to version 3.0 or 4.0?
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