大约有 44,000 项符合查询结果（耗时：0.0167秒） [XML]
Return all enumerables with yield return at once; without looping through
...ods each returning an IEnumerable<ErrorInfo>, you can use Enumerable.Concat to make your code simpler:
private static IEnumerable<ErrorInfo> GetErrors(Card card)
{
return GetMoreErrors(card).Concat(GetOtherErrors())
.Concat(GetValidationErrors())
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Append column to pandas dataframe
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Or pd.concat([dat1, dat2], axis=1) in this case.
– DSM
Dec 16 '13 at 3:35
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How do I kill all the processes in Mysql “show processlist”?
...n saves time. Do it in MySql itself:
Run these commands
mysql> select concat('KILL ',id,';') from information_schema.processlist
where user='root' and time > 200 into outfile '/tmp/a.txt';
mysql> source /tmp/a.txt;
Reference
---------edit------------
if you do not want to store in f...
How can I append a string to an existing field in MySQL?
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You need to use the CONCAT() function in MySQL for string concatenation:
UPDATE categories SET code = CONCAT(code, '_standard') WHERE id = 1;
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Adding two Java 8 streams, or an extra element to a stream
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If you add static imports for Stream.concat and Stream.of, the first example could be written as follows:
Stream<Foo> stream = concat(stream1, concat(stream2, of(element)));
Importing static methods with generic names can result in code that becomes dif...
How can I return pivot table output in MySQL?
...nother way to generate a pivot table without using "if", "case", or "GROUP_CONCAT": en.wikibooks.org/wiki/MySQL/Pivot_table
– user2513149
Oct 16 '16 at 16:15
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Elegant way to combine multiple collections of elements?
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I think you might be looking for LINQ's .Concat()?
var combined = foo.Concat(bar).Concat(foobar).Concat(...);
Alternatively, .Union() will remove duplicate elements.
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Finding duplicate values in MySQL
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@NobleUplift You can do a GROUP_CONCAT(id) and it will list the IDs. See my answer for an example.
– Matt Rardon
Feb 19 '15 at 0:53
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what is the preferred way to mutate a React state?
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concat returns a new array, so you can do
this.setState({list: this.state.list.concat([newObject])});
another alternative is React's immutability helper
var newState = React.addons.update(this.state, {
list : {
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String output: format or concat in C#?
Let's say that you want to output or concat strings. Which of the following styles do you prefer?
31 Answers
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