大约有 531 项符合查询结果（耗时：0.0208秒） [XML]
Add list to set?
...
With respect to sets, the | operator implements the set union operation. Both the |= operator and set.update() method apply that operation in-place and are effectively synonymous. So, set_a |= set_b could be considered syntactic sugar for both set_a.update(set_b) and set_a = set_a...
Inserting multiple rows in a single SQL query? [duplicate]
... Only SQLite 3.7.11 onwards. If you cannot guarantee that, use the UNION method shown here: stackoverflow.com/a/5009740/841830
– Darren Cook
Feb 13 '14 at 1:12
3
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Insert multiple rows WITHOUT repeating the “INSERT INTO …” part of the statement?
...
INSERT INTO dbo.MyTable (ID, Name)
SELECT 123, 'Timmy'
UNION ALL
SELECT 124, 'Jonny'
UNION ALL
SELECT 125, 'Sally'
For SQL Server 2008, can do it in one VALUES clause exactly as per the statement in your question (you just need to add a comma to separate each values statement)....
How to push both value and key into PHP array
...
You can use the union operator (+) to combine arrays and keep the keys of the added array. For example:
<?php
$arr1 = array('foo' => 'bar');
$arr2 = array('baz' => 'bof');
$arr3 = $arr1 + $arr2;
print_r($arr3);
// prints:
// arr...
How do I check if there are duplicates in a flat list?
...6]), set([2, 3]))
"""
return reduce(
lambda (u, d), o : (u.union([o]), d.union(u.intersection([o]))),
a_list,
(set(), set()))
if __name__ == "__main__":
import doctest
doctest.testmod()
From there you can test unicity by checking whether the second element ...
Should I add .vcxproj.filter files to source control?
...st found that if you use Git you can mark .filter files to be treated as a union for merging to make it simpler. Just add the line:
*.vcxproj.filters merge=union
to your .gitattributes file.
See Using .gitattributes to avoid merge conflicts for more details.
...
MySQL LIKE IN()?
...CT *
FROM fiberbox f
JOIN (
SELECT '%1740%' AS cond
UNION ALL
SELECT '%1938%' AS cond
UNION ALL
SELECT '%1940%' AS cond
) с
ON f.fiberBox LIKE cond
This, however, can return you multiple rows for a fiberbox that is something like '1740, ...
When to use Common Table Expression (CTE)
... ,null AS Answer
,1 AS Is_Question
FROM [Questions]
UNION ALL
SELECT Q.[Quiz_ID]
,[Question_ID]
,A.[ID] AS Answer_Id
,Q.Question_Text
,[Answer]
,0 AS Is_Question
FROM [Answers] A INNER JOIN [Questions] Q ON Q.Quiz_ID = A.Quiz...
Simplest way to do a recursive self-join?
...nes the ultimate ancestors in your chain, change it as appropriate
UNION ALL
SELECT m.*
FROM mytable m
JOIN q
ON m.parentID = q.PersonID
)
SELECT *
FROM q
By adding the ordering condition, you can preserve the tree order:
WITH q A...
LINQ to SQL - Left Outer Join with multiple join conditions
... select c;
}
// Add the specified content using UNION
content = content.Union(addMoreContent);
// Exclude the duplicates using DISTINCT
content = content.Distinct();
return content;
}
catch (MyLovelyException ex...