大约有 45,000 项符合查询结果（耗时：0.0806秒） [XML]
Reason for Column is invalid in the select list because it is not contained in either an aggregate f
...table T:
a b
--------
1 abc
1 def
1 ghi
2 jkl
2 mno
2 pqr
And I do the following query:
SELECT a, b
FROM T
GROUP BY a
The output should have two rows, one row where a=1 and a second row where a=2.
But what should the value of b show on each of these two rows? There are three pos...
Is there any difference between GROUP BY and DISTINCT
...the SQL Server is smart enough to realize that if you are using "Group By" and not using any aggregate functions, then what you actually mean is "Distinct" - and therefore it generates an execution plan as if you'd simply used "Distinct."
However, I think it's important to note Hank's response as w...
Show DialogFragment with animation growing from a point
...styles.xml add your custom theme:
<style name="MyCustomTheme" parent="@android:style/Theme.Panel">
<item name="android:windowAnimationStyle">@style/MyAnimation.Window</item>
</style>
<style name="MyAnimation.Window" parent="@android:style/Animation.Activity">
...
Conversion of System.Array to List
... to List". Should add that example for completeness IMO. (Being top answer and all)
– Søren Ullidtz
Jan 22 '15 at 8:14
4
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Renaming the current file in Vim
...
This updated version of Rename.vim handles CWD correctly - always saves file in the directory of original one.
– sickill
Sep 4 '11 at 17:56
4...
Why isn't there a Guid.IsNullOrEmpty() method
...Jun 13 '17 at 3:03
Shimmy Weitzhandler
89k116116 gold badges372372 silver badges585585 bronze badges
answered Mar 23 '12 at 10:29
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Changing the color of the axis, ticks and labels for a plot in matplotlib
I'd like to Change the color of the axis, as well as ticks and value-labels for a plot I did using matplotlib an PyQt.
3 An...
How do you concatenate Lists in C#?
...working fine I think so. As previously said, Concat returns a new sequence and while converting the result to List, it does the job perfectly.
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Reverting a single file to a previous version in git [duplicate]
... to go through different commits on a file.
Say I modified a file 5 times and I want to go back to change 2, after I already committed and pushed to a repository.
...
Join strings with a delimiter only if strings are not null or empty
...icient solution working in a wide range of browsers (including IE 5.5 - 8) and which doesn't require jQuery, see below:
var join = function (separator /*, strings */) {
// Do not use:
// var args = Array.prototype.slice.call(arguments, 1);
// since it prevents optimizations in Java...