大约有 48,000 项符合查询结果（耗时：0.0281秒） [XML]
MySQL JOIN the most recent row only?
... max_id, customer_id
FROM customer_data
GROUP BY customer_id
) c_max ON (c_max.customer_id = c.customer_id)
JOIN customer_data cd ON (cd.id = c_max.max_id)
WHERE CONCAT(title, ' ', forename, ' ', surname) LIKE '%Smith%'
LIMIT 10, 20;
Note...
Can enums be subclassed to add new elements?
...B is {a,b,c,d}*/
can be written as:
public enum All {
a (ClassGroup.A,ClassGroup.B),
b (ClassGroup.A,ClassGroup.B),
c (ClassGroup.A,ClassGroup.B),
d (ClassGroup.B)
...
ClassGroup.B.getMembers() contains {a,b,c,d}
How it can be useful: Let say we want ...
Regex match everything after question mark?
...
\?(.*)
You want the content of the first capture group.
share
|
improve this answer
|
follow
|
...
SQL join: selecting the last records in a one-to-many relationship
...
This is an example of the greatest-n-per-group problem that has appeared regularly on StackOverflow.
Here's how I usually recommend solving it:
SELECT c.*, p1.*
FROM customer c
JOIN purchase p1 ON (c.id = p1.customer_id)
LEFT OUTER JOIN purchase p2 ON (c.id = p2.c...
Warning: Null value is eliminated by an aggregate or other SET operation in Aqua Data Studio
...
where assigned_to = c.user_id and closed is not null
group by assigned_to), 0),
opencases = ISNULL(
(select count(closed) from ticket
where assigned_to = c.user_id and closed is null
group by assigned_to), 0),
...
Best practice: ordering of public/protected/private within the class definition?
...
I think I have a different philosophy on this than most. I prefer to group related items together. I can't stand having to jump around to work with a class. The code should flow and using a rather artificial ordering based on accessibility (public, private, protected etc. ) or instance versus ...
How can I concatenate regex literals in JavaScript?
...
This solution does not work in the case of back-matching groups. See my answer for a working solution in that case.
– Mikaël Mayer
Nov 28 '14 at 15:03
...
Javascript regex returning true.. then false.. then true.. etc [duplicate]
... I guess if you make a global regular expression with capturing groups and call test on that, it’s sort of a crazy request - what capturing group are you trying to test? Not to excuse javascript, they picked the craziest possible solution to a slightly crazy problem..
...
What is the reason for performing a double fork when creating a daemon?
... for anyone who has the same question.
In Unix every process belongs to a group which in turn belongs to a session. Here is the hierarchy…
Session (SID) → Process Group (PGID) → Process (PID)
The first process in the process group becomes the process group leader and the first process in t...
How to set thousands separator in Java?
...alFormatSymbols symbols = formatter.getDecimalFormatSymbols();
symbols.setGroupingSeparator(' ');
formatter.setDecimalFormatSymbols(symbols);
System.out.println(formatter.format(bd.longValue()));
According to the JavaDoc, the cast in the first line should be save for most locales.
...