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Does MySQL index foreign key columns automatically?
... as being a "redundant index". I tried to drop it but I got the following error: "ERROR 1553 (HY000): Cannot drop index 'index_name': needed in a foreign key constraint". So, it's not possible to drop that index and keep the foreign key.
– Ciprian Stoica
Oct ...
What represents a double in sql server?
... With some quick and dodgy mental arithmetic... the rounding/approximation errors would be the about the length of this fill stop -> "."
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iFrame src change event detection?
...);
https://jquery.com/upgrade-guide/3.0/#breaking-change-load-unload-and-error-removed
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Arrow operator (->) usage in C
...ointer has no members! And compiler knows this and will therefore issue an error e.g.:
error: ‘ptr’ is a pointer; did you mean to use ‘->’?
printf("%d\n", *ptr.km);
Instead you use this (*ptr).kg and you force compiler to 1st dereference the pointer and enable acess to the chunk of d...
When would you use the different git merge strategies?
...the default 'recursive' for a two-head merge that had fatal git-write-tree errors. 'Resolve' strategy merged cleanly. It may have had to do with moving a lot of files around in the branch being merged.
– thaddeusmt
May 17 '12 at 12:51
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How to replace strings containing slashes with sed?
... contains the actual delimiter used by sed - then sed terminates on syntax error. Consider the following example:
This works:
$ VALUE=12345
$ echo "MyVar=%DEF_VALUE%" | sed -e s/%DEF_VALUE%/${VALUE}/g
MyVar=12345
This breaks:
$ VALUE=12345/6
$ echo "MyVar=%DEF_VALUE%" | sed -e s/%DEF_VALUE%/${V...
Finish an activity from another activity
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It shows this error "Syntax error on tokens, AnnotationName expected instead" on "registerReceiver(broadcast_reciever, new IntentFilter("finish_activity"));". What's wrong?
– Behzad
Nov 13 '12 at 8:2...
Impossible to Install PG gem on my mac with Mavericks
...l the pg gem in order to work again with my rails projects. But I get this error:
26 Answers
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Xcode 6 Bug: Unknown class in Interface Builder file
... Actually in my case i had to remove customModuleProvider, then the error went away.
– Maciej Swic
Mar 11 '15 at 13:15
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Deep copying an NSArray
...erialization dataWithJSONObject:oldCopy options:NSJSONWritingPrettyPrinted error:nil];
NSDictionary *aDictNewCopy = [NSJSONSerialization JSONObjectWithData:aDataOfSource options:NSJSONReadingMutableLeaves error:nil];
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