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Struct inheritance in C++
... important distinction, since for example, only POD structs can be part of unions.
– camh
Jun 11 '09 at 7:00
9
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what is the unsigned datatype?
...lex
— long double _Complex
— atomic type specifier
— struct or union specifier
— enum specifier
— typedef name
So in case of unsigned int we can either write unsigned or unsigned int, or if we are feeling crazy, int unsigned. The latter since the standard is stupid enough to ...
Using sed and grep/egrep to search and replace
I am using egrep -R followed by a regular expression containing about 10 unions, so like:
.jpg | .png | .gif etc. This works well, now I would like to replace all strings found with .bmp
...
Difference between const & const volatile
...and volatile separately. Besides, these type qualifier applies for struct, union, enum and typedef as well.
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Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...ations. In particular, when a query has multiple query blocks
(e.g. with UNION), there's simply no way to calculate the number of
“would-have-been” rows at the same time as producing a valid query. As
the iterator executor is progressing towards these kinds of queries,
it is genuinely di...
What is the purpose of std::make_pair vs the constructor of std::pair?
... Also note that make_pair works with unnamed types, including structs, unions, lambdas, and other doodads.
– Mooing Duck
Feb 6 '15 at 22:29
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How to get the top 10 values in postgresql?
...ns here>
WHERE <various conditions>
ORDER BY date DESC
LIMIT 10)
UNION ALL
(SELECT <some columns>
FROM mytable
<maybe some joins here>
WHERE <various conditions>
ORDER BY date ASC
LIMIT 10)
...
Python Sets vs Lists
...from a sequence, and compute mathematical operations such as intersection, union, difference, and symmetric difference.
Usage
From some of the answers, it is clear that a list is quite faster than a set when iterating over the values. On the other hand, a set is faster than a list when checking if...
How to delete from select in MySQL?
... SELECT id
FROM posts
GROUP BY id
HAVING COUNT(id) = 1
UNION
SELECT id
FROM posts
GROUP BY id
HAVING COUNT(id) != 1
) AS duplicate USING (id)
WHERE duplicate.id IS NULL;
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Errors: “INSERT EXEC statement cannot be nested.” and “Cannot use the ROLLBACK statement within an I
...ble approach: -
CREATE PROCEDURE SP3 as
BEGIN
SELECT 1, 'Data1'
UNION ALL
SELECT 2, 'Data2'
END
go
CREATE PROCEDURE SP2 as
BEGIN
if exists (select * from tempdb.dbo.sysobjects o where o.xtype in ('U') and o.id = object_id(N'tempdb..#tmp1'))
INSERT INTO #tmp1
...