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How to create a MySQL hierarchical recursive query
... parent_id
from products
where parent_id = 19
union all
select p.id,
p.name,
p.parent_id
from products p
inner join cte
on p.parent_id = cte.id
)
select * from cte;
The value specified in parent_id = 19 should be set ...
What's the $unwind operator in MongoDB?
...
Or another way to think of it is UNION ALL
– Jeb50
Apr 9 '17 at 23:44
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How can I pair socks from a pile efficiently?
...ll (because they have thread-local piles). At the end, all workers need to union their pile-sets. I believe that can be done in O(log (worker count * piles per worker)) if the workers form an aggregation tree.
What about the element distinctness problem? As the article states, the element distinct...
What is the list of supported languages/locales on Android?
...h Polynesia)]
fr_PM [French (Saint Pierre and Miquelon)]
fr_RE [French (Réunion)]
fr_RW [French (Rwanda)]
fr_SC [French (Seychelles)]
fr_SN [French (Senegal)]
fr_SY [French (Syria)]
fr_TD [French (Chad)]
fr_TG [French (Togo)]
fr_TN [French (Tunisia)]
fr_VU [French (Vanuatu)]
fr_WF [French (Wallis a...
Select first row in each GROUP BY group?
... FROM purchases
ORDER BY customer_id, total DESC
LIMIT 1
)
UNION ALL
SELECT u.*
FROM cte c
, LATERAL (
SELECT id, customer_id, total
FROM purchases
WHERE customer_id > c.customer_id -- lateral reference
ORDER BY customer_id, total DESC
...
Is a `=default` move constructor equivalent to a member-wise move constructor?
... 15 which says:
The implicitly-defined copy/move constructor for a non-union class X
performs a memberwise copy/move of its bases and members. [ Note:
brace-or-equal-initializers of non-static data members are ignored.
See also the example in 12.6.2. —end note ] The order of
initializa...
How can I add reflection to a C++ application?
...ble with C++.
Inspection by checking whether a class-type (class, struct, union) has a method or nested type, is derived from another particular type.
This kind of thing is possible with C++ using template-tricks. Use boost::type_traits for many things (like checking whether a type is integral). Fo...
How is Docker different from a virtual machine?
...e host, see superuser.com/questions/889472/…. However, to illustrate the union filesystem of the containers, there could be a shared layer of libs/bins directly above the docker engine.
– Betamos
Dec 5 '15 at 1:33
...
Multiple INSERT statements vs. single INSERT with multiple VALUES
...2008 don't seem to be available so instead I had to look at the equivalent UNION ALL construction in SQL Server 2005.
A typical stack trace is below
sqlservr.exe!FastDBCSToUnicode() + 0xac bytes
sqlservr.exe!nls_sqlhilo() + 0x35 bytes
sqlservr.exe!CXVariant::CmpCompareStr() + 0x2b bytes ...
Big-O for Eight Year Olds? [duplicate]
.... As a rough category, I would include algorithms such as hash lookups and Union-Find here, even though neither of those are actually O(1).
O(log(n)) "logarithmic" - it gets slower as you get larger inputs, but once your input gets fairly large, it won't change enough to worry about. If your runtime...