大约有 42,000 项符合查询结果（耗时：0.0358秒） [XML]
How to get the first five character of a String
...
You can save a call to ToArray() by using String.Concat() like so: string firstFivChar = String.Concat(yourStringVariable.Take(5));
– BlueFuzzyThing
Aug 14 '19 at 17:44
...
Reason for Column is invalid in the select list because it is not contained in either an aggregate f
...
@davidblaine, MySQL has a function GROUP_CONCAT() for that. dev.mysql.com/doc/refman/5.5/en/… But in standard SQL, each column should contain only one value. That's fundamental to relational theory too.
– Bill Karwin
Dec 22...
Easy way to convert Iterable to Collection
...of appending a source Collection with another element. I can use Iterables.concat() but that gives an Iterable, not a Collection :(
– Hendy Irawan
May 10 '14 at 11:53
1
...
Get local IP address in node.js
... Object.values(require('os').networkInterfaces()).reduce((r, list) => r.concat(list.reduce((rr, i) => rr.concat(i.family==='IPv4' && !i.internal && i.address || []), [])), [])
– som
Jan 17 '19 at 0:15
...
MySQL LIKE IN()?
...
To get the regexp value from a column: (select group_concat(myColumn separator '|') from..)
– daVe
Nov 28 '15 at 1:05
5
...
Max or Default?
...f it is actually the minimum. To determine which option is more efficient (Concat, FirstOrDefault or Take(1)), you should perform adequate benchmarking.
double x = context.MyTable
.Where(y => y.MyField == value)
.Select(y => y.MyCounter)
.Concat(new double[]{Double.MinValue})
...
What's the difference between console.dir and console.log?
... 0: 1
1: 2
2: 3
length: 3
* __proto__: Array[0]
concat: function concat() { [native code] }
constructor: function Array() { [native code] }
entries: function entries() { [native code] }
...
DOM objects also exhibit differing behavior, as noted on ...
Find and Replace text in the entire table using a MySQL query
...lace = "replace_with_this_text";
$loop = mysql_query("
SELECT
concat('UPDATE ',table_schema,'.',table_name, ' SET ',column_name, '=replace(',column_name,', ''{$find}'', ''{$replace}'');') AS s
FROM
information_schema.columns
WHERE
table_schema = '{$database}'")
o...
Adding values to a C# array
...
Using Linq's method Concat makes this simple
int[] array = new int[] { 3, 4 };
array = array.Concat(new int[] { 2 }).ToArray();
result
3,4,2
share
|
...
Lock Escalation - What's happening here?
...
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
GO
CREATE TABLE dbo.Tmp_Test
(
ID int NOT NULL,
Col1 nvarchar(10) NOT NULL,
Col2 int NOT NULL
...