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How to delete from select in MySQL?
...ner subquery result (looks rather hacky, though):
DELETE FROM posts WHERE id IN (
SELECT * FROM (
SELECT id FROM posts GROUP BY id HAVING ( COUNT(id) > 1 )
) AS p
)
Or use joins as suggested by Mchl.
sh...
How can I find my Apple Developer Team id and Team Agent Apple ID?
...ying to transfer an app. I am having troubles finding my team agent apple id and my team id. I have found it before and I have searched for 30 min without any luck now that i need it.
...
How to construct a REST API that takes an array of id's for the resources
...ce. Then you would have an URL template like the following:
api.com/users?id=id1,id2,id3,id4,id5
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How to find out client ID of component for ajax update/render? Cannot find component with expression
The following code is inspired from PrimeFaces DataGrid + DataTable Tutorials and put into a <p:tab> of a <p:tabView> residing in a <p:layoutUnit> of a <p:layout> . Here is the inner part of the code (starting from p:tab component); the outer part is trivial.
...
How to automatically generate a stacktrace when my program crashes
...ure the resulting backtrace points to the actual location of the fault (at least for some architectures - x86 & ARM).
The first two entries in the stack frame chain when you get into the signal handler contain a return address inside the signal handler and one inside sigaction() in libc. The sta...
How to find gaps in sequential numbering in mysql?
...
Update
ConfexianMJS provided much better answer in terms of performance.
The (not as fast as possible) answer
Here's version that works on table of any size (not just on 100 rows):
SELECT (t1.id + 1) as gap_starts_at,
(SELECT MIN(t3.id) -...
How do you design object oriented projects? [closed]
...run-time interactions between objects. You're program's algorithms are at least as important as your objects, and they're much easier to design if you've spelled out what each class's job is.
Once you've got that minimal set of use cases and objects, start coding. Get something that actually runs ...
Why should eval be avoided in Bash, and what should I use instead?
...use it runs echo hello world and then tries to run the captured output (at least in the contexts where I think you're using it), which will fail unless you've got a program called hello kicking around.
– Jonathan Leffler
Jun 8 '15 at 6:41
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C++ - passing references to std::shared_ptr or boost::shared_ptr
...ject it points to will still exist, because its reference count will be at least 1.
Class::only_work_with_sp(boost::shared_ptr<foo> sp)
{
// sp points to an object that cannot be destroyed during this function
}
So by using a reference to a shared_ptr, you disable that guarantee. So in ...
SELECT DISTINCT on one column
...r greater, you can use a CTE with ROW_NUMBER():
SELECT *
FROM (SELECT ID, SKU, Product,
ROW_NUMBER() OVER (PARTITION BY PRODUCT ORDER BY ID) AS RowNumber
FROM MyTable
WHERE SKU LIKE 'FOO%') AS a
WHERE a.RowNumber = 1
...