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How to add 'ON DELETE CASCADE' in ALTER TABLE statement
...d try your above command, put add constraint instead of modify constraint.
Now this is the command:
ALTER TABLE child_table_name
ADD CONSTRAINT fk_name
FOREIGN KEY (child_column_name)
REFERENCES parent_table_name(parent_column_name)
ON DELETE CASCADE;
...
How do I write output in same place on the console?
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@Diego there's now a support library for curses module on Windows. see stackoverflow.com/a/19851287/1426237
– Plexico
Nov 8 '13 at 14:51
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Best way to handle list.index(might-not-exist) in python?
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I know it can only be thrown from that method but is it guaranteed to only be thrown for that reason? Not that I can think of another reason index would fail..but then aren't exceptions for exactly those things you may not think...
Select all columns except one in MySQL?
... This is way worse than just specifying the columns which is a known best practice.
– HLGEM
Jan 16 '14 at 18:08
3
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Is there a way to avoid null check before the for-each loop iteration starts? [duplicate]
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It's already 2017, and you can now use Apache Commons Collections4
The usage:
for(Object obj : CollectionUtils.emptyIfNull(list1)){
// Do your stuff
}
share
|
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How can I wait for set of asynchronous callback functions?
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if (ajaxCallsRemaining <= 0) {
// all data is here now
// look through the returnedData and do whatever processing
// you want on it right here
}
});
}
Note: error handling is important here (not shown because it's specific to how you're...
JavaScript - Get minutes between two dates
...("2012-12-25");
var diffMs = (Christmas - today); // milliseconds between now & Christmas
var diffDays = Math.floor(diffMs / 86400000); // days
var diffHrs = Math.floor((diffMs % 86400000) / 3600000); // hours
var diffMins = Math.round(((diffMs % 86400000) % 3600000) / 60000); // minutes
al...
String comparison in bash. [[: not found
... Happend to me because i ran the script with sh, lots for frustration. Now i just have to redo everything i undid before finding this answer.
– Louis Loudog Trottier
May 16 '18 at 5:01
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Get value of a string after last slash in JavaScript
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When I know the string is going to be reasonably short then I use the following one liner... (remember to escape backslashes)
// if str is C:\windows\file system\path\picture name.jpg
alert( str.split('\\').pop() );
alert pops up ...
How do I get the name of the active user via the command line in OS X?
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If you want to know who's currently logged in to the system:
$ w
15:56:14 up 5 days, 20:58, 6 users, load average: 0.43, 0.53, 0.50
USER TTY LOGIN@ IDLE JCPU PCPU WHAT
me pts/2 Fri19 1:03m 0.98s 0.98s -/b...