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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails
... table. Following query would be helpful to fetch those non-matching rows:
SELECT child_table.*
FROM child_table
LEFT JOIN parent_table
ON parent_table.referenced_column = child_table.referencing_column
WHERE parent_table.referenced_column IS NULL
Now, you can generally do one (or more) of th...
Opening port 80 EC2 Amazon web services [closed]
...up when I had similar issue.
Go to Security Groups tab, go to Inbound tab, select HTTP in Create a new rule combo-box, leave 0.0.0.0/0 in source field and click Add Rule, then Apply rule changes.
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Is the SQL WHERE clause short-circuit evaluated?
...y use this for optional parameters. Is this the same as short circuiting?
SELECT [blah]
FROM Emp
WHERE ((@EmpID = -1) OR (@EmpID = EmpID))
This gives me the option to pass in -1 or whatever to account for optional checking of an attribute. Sometimes this involves joining on multiple tables, ...
Git push existing repo to a new and different remote repo server?
...
git reset 4b62bdc9087bf33cc01d0462bf16bbf396369c81 --hard
Alternatively select the commit by git cherry-pick to append into existing HEAD.
Then push to your new repo:
git push https://github.com/user/example new_branch:master
If you're rebasing, use -f for force push (not recommended). Run git...
How to add http:// if it doesn't exist in the URL?
...
This should be the selected answer - why roll your own when the language has native support? Nice work.
– Tom Auger
Aug 19 '13 at 15:24
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ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'db'
... problem was:
To see which user you are, and whose permissions you have:
select user(), current_user();
To delete the pesky anonymous user:
drop user ''@'localhost';
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How do I set GIT_SSL_NO_VERIFY for specific repos only?
...into the local config file by doing a context-specific Settings update and selecting the option to edit local only
– Steve Townsend
Aug 7 '16 at 14:11
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Twitter image encoding challenge [closed]
...s not pretty but it works. You can also comment out the default table and select printable 7-bit ASCII (again excluding <, >, and & characters) or CJK Unified Ideographs instead. The table of which character codes are available is stored a run-length encoded with alternating runs of inva...
How to set MSDN to be always in English
...
You can select your default language from bottom left of the page.
Edit
New docs site has an easier option to view in English. However, the setting is not permanent.
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What is an ORM, how does it work, and how should I use one? [closed]
...anually, you would do something like that:
book_list = new List();
sql = "SELECT book FROM library WHERE author = 'Linus'";
data = query(sql); // I over simplify ...
while (row = data.next())
{
book = new Book();
book.setAuthor(row.get('author');
book_list.add(book);
}
With an ORM ...