大约有 44,000 项符合查询结果（耗时：0.0291秒） [XML]
MySQL LIKE IN()?
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To get the regexp value from a column: (select group_concat(myColumn separator '|') from..)
– daVe
Nov 28 '15 at 1:05
5
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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
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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})
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How to check if an object is an array?
...r ];
}
Or if you're not concerned about performance, you could just do a concat to a new empty Array.
someVar = [].concat( someVar );
There's also the constructor which you can query directly:
if (somevar.constructor.name == "Array") {
// do something
}
Check out a thorough treatment f...
How to do ToString for a possibly null object?
...nger than just "" + myObj. But I've read that creates extra strings. str.Concat(myObj) seems to work just fine and is "even faster".
– drzaus
Dec 1 '17 at 17:48
add a commen...
How to change collation of database, table, column?
...ll tables to a certain type (utf8_general_ci in my example below).
SELECT concat
(
'ALTER TABLE ',
t1.TABLE_SCHEMA,
'.',
t1.table_name,
' MODIFY ',
t1.column_name,
' ',
...
How can I determine if a date is between two dates in Java? [duplicate]
...er year = cal.get(Calendar.YEAR);
oeStartDateStr = oeStartDateStr.concat(year.toString());
oeEndDateStr = oeEndDateStr.concat(year.toString());
Date startDate = sdf.parse(oeStartDateStr);
Date endDate = sdf.parse(oeEndDateStr);
Date d = new Date();
S...
MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer
... string MakeArrayKey(string prefix, int index)
{
return string.Concat(prefix, "[", index.ToString(CultureInfo.InvariantCulture), "]");
}
private static string MakePropertyKey(string prefix, string propertyName)
{
if (string.IsNullOrEmpty(prefix))
{
...
How can I combine two HashMap objects containing the same types?
...ual keys and values, so you'll need to use a loop or Map.forEach. Here we concatenate strings for duplicate keys:
map3 = new HashMap<>(map1);
for (Map.Entry<String, String> e : map2.entrySet())
map3.merge(e.getKey(), e.getValue(), String::concat);
//or instead of the above loop
map...
parseInt vs unary plus, when to use which?
...ALUES.map(function (v) {
var x = eval('(' + v + ')');
return [v].concat(EXPRS.map(function (e) {
return val(eval(e))
}));
});
document.body.innerHTML = table(["x"].concat(EXPRS), rows);
table { border-collapse: collapse }
tr:nth-child(odd) { background: #fafafa }
td { ...