大约有 48,000 项符合查询结果（耗时：0.0425秒） [XML]
How to display unique records from a has_many through relationship?
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You could use group_by. For example, I have a photo gallery shopping cart for which I want order items to be sorted by which photo (each photo can be ordered multiple times and in different size prints). This then returns a hash with the...
omp parallel vs. omp parallel for
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These are equivalent.
#pragma omp parallel spawns a group of threads, while #pragma omp for divides loop iterations between the spawned threads. You can do both things at once with the fused #pragma omp parallel for directive.
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Cast int to varchar
...a similar issue trying to concatenate a char and an int together using the GROUP_CONCAT method.
In summary, what has worked for me is this:
let's say your char is 'c' and int is 'i', so, the query becomes:
...GROUP_CONCAT(CONCAT(c,' ', CAST(i AS CHAR))...
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jQuery see if any or no checkboxes are selected
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Rahul's answer is best fit for your question. Anyway, if you have a group of checkboxes to be checked and not all the checkbox in your form, you can go for it.
Put a classname for all the checkboxes you want to check, say for example, a classname test_check and now you can check if any of th...
Keyboard shortcut to comment lines in Sublime Text 3
...rue) again and press Ctrl+/ and Ctrl+Shift+/, do you still get the move_to_group and focus_group commands?
– dusan
Jul 19 '13 at 17:30
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jQuery get value of selected radio button
... is simple. I need to see if user has selected a radio button from a radio group. Every radio button in the group share same id.
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How do I convert from BLOB to TEXT in MySQL?
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This works great for those GROUP_CONCATs that convert your output to blobs and you really want them as strings. I had an issue similar to the OP's while using Node.JS with the node-mysql library - this fixed all group_concat issues.
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Print Current Mercurial Revision Hash?
..., the . (dot) only displays the first parent of two parents of the working group.
– Shelby Moore III
Nov 26 '15 at 16:20
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Avoid duplicates in INSERT INTO SELECT query in SQL Server
... in the original table, and the column possibly duplicated is not an id, a GROUP BY will do:
INSERT INTO TABLE_2
(name)
SELECT t1.name
FROM TABLE_1 t1
GROUP BY t1.name
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How to get nth jQuery element
...sired behavior. $('select').find('option').eq(n) will basically ignore the grouping, and get all options as a whole. If you want it per group, something like this is necessary: $('select').find('optgroup').each(function() { $(this).find('option').eq(n)...; })
– Dykam
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