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Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
...me records that the automations table referred to caused it to throw this "Error Code: 1452. Cannot add or update a child row: a foreign key constraint fails".
– Ryan
Jan 25 '19 at 22:43
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How do I start PowerShell from Windows Explorer?
Is there a way to start PowerShell in a specific folder from Windows Explorer, e.g. to right-click in a folder and have an option like "Open PowerShell in this Folder"?
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Which is faster : if (bool) or if(int)?
The above topic made me do some experiments with bool and int in if condition. So just out of curiosity I wrote this program:
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getting the ng-object selected with ng-change
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Does this work without specifying a model? I get this error: Controller 'ngModel', required by directive 'select', can't be found!
– fer
Mar 29 '14 at 10:30
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Piping command output to tee but also save exit code of command [duplicate]
...=`mktemp`
(mvn clean install $@; echo $?>$f) | tee $logfile
e=`cat $f` #error in variable e
rm $f
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Maximum single-sell profit
...e we are given an array of n integers representing stock prices on a single day. We want to find a pair (buyDay, sellDay) , with buyDay ≤ sellDay , such that if we bought the stock on buyDay and sold it on sellDay , we would maximize our profit.
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How to truncate a foreign key constrained table?
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when I'm using delete statement, it report error 1175: You are using safe update mode, just add SET SQL_SAFE_UPDATES = 0; then it's fine
– user4985526
Apr 20 '16 at 2:41
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Impossible to make a cached thread pool with a size limit?
It seems to be impossible to make a cached thread pool with a limit to the number of threads that it can create.
13 Answers...
Passing an array to a query using a WHERE clause
... must be at least one value inside the parenthesis or MySQL will return an error; this equates to making sure that our input array has at least one value. To help prevent against SQL injection attacks, first generate a ? for each input item to create a parameterized query. Here I assume that the arr...
(Built-in) way in JavaScript to check if a string is a valid number
I'm hoping there's something in the same conceptual space as the old VB6 IsNumeric() function?
37 Answers
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