大约有 44,000 项符合查询结果（耗时：0.0332秒） [XML]
do { … } while (0) — what is it good for? [duplicate]
...
@WChargin: the "goto fail" code in the article you linked too would have failed with a "break" too. Somebody just duplicated a line there. It wasn't goto's fault.
– Niccolo M.
Jun 15 '14 a...
An explicit value for the identity column in table can only be specified when a column list is used
...tead of
SET IDENTITY_INSERT archive_table ON;
INSERT INTO archive_table
SELECT *
FROM source_table;
SET IDENTITY_INSERT archive_table OFF;
you need to write
SET IDENTITY_INSERT archive_table ON;
INSERT INTO archive_table (field1, field2, ...)
SELECT field1, field2, ...
FROM source_table;...
Is 'switch' faster than 'if'?
...ecific questions:
Clang generates one that looks like this:
test_switch(char): # @test_switch(char)
movl %edi, %eax
cmpl $19, %edi
jbe .LBB0_1
retq
.LBB0_1:
jmpq *.LJTI0_0(,%rax,8)
jmp void call<0u>() ...
jQuery set radio button
...
Your selector looks for the descendant of a input:radio[name=cols] element that has the id of newcol (well the value of that variable).
Try this instead (since you're selecting by ID anyway):
$('#' + newcol).prop('checked',true)...
LINQ's Distinct() on a particular property
...
(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
{
HashSet<TKey> seenKeys = new HashSet<TKey>();
foreach (TSource element in source)
{
if (seenKeys.Add(keySelector(element)))
{
yield return element;
}
...
Why in Java 8 split sometimes removes empty strings at start of result array?
... grepcode, for version 7u40-b43 and 8-b132.
Java 7
public String[] split(CharSequence input, int limit) {
int index = 0;
boolean matchLimited = limit > 0;
ArrayList<String> matchList = new ArrayList<>();
Matcher m = matcher(input);
// Add segments before each ma...
What is the difference between JOIN and JOIN FETCH when using JPA and Hibernate
...ent attribute. Otherwise, (valid at least for PG) you might get ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list
– long
Apr 21 at 14:08
add a commen...
SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column
...result set to update is before running the update (same query, just with a select):
select *
from QuestionTrackings q
inner join QuestionAnswers a
on q.AnswerID = a.AnswerID
where q.QuestionID is null -- and other conditions you might want
Particularly whether each answer id has definitely only 1...
How to save MySQL query output to excel or .txt file? [duplicate]
...SV file:
MySQL provides an easy mechanism for writing the results of a select
statement into a text file on the server. Using extended options of
the INTO OUTFILE nomenclature, it is possible to create a comma
separated value (CSV) which can be imported into a spreadsheet
application suc...
How to make a query with group_concat in sql server [duplicate]
...
Query:
SELECT
m.maskid
, m.maskname
, m.schoolid
, s.schoolname
, maskdetail = STUFF((
SELECT ',' + md.maskdetail
FROM dbo.maskdetails md
WHERE m.maskid = md.maskid
FOR X...