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MySQL Data - Best way to implement paging?
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When using LIMIT for paging you should also specify an ORDER BY.
– Mark Byers
Sep 26 '10 at 18:42
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What is the correct answer for cout
...ce result b, which outputs 01.
See P0145R3 Refining Expression Evaluation Order for Idiomatic C++ for more details.
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Dynamic Sorting within SQL Stored Procedures
...eah, it's a pain, and the way you're doing it looks similar to what I do:
order by
case when @SortExpr = 'CustomerName' and @SortDir = 'ASC'
then CustomerName end asc,
case when @SortExpr = 'CustomerName' and @SortDir = 'DESC'
then CustomerName end desc,
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This, to me, is still much ...
Return 0 if field is null in MySQL
... Would that be IFNULL((SELECT SUM(uop.price * uop.qty) FROM uc_order_products uop WHERE uo.order_id = uop.order_id) AS products_subtotal, 0)?
– Kevin
Oct 22 '10 at 13:46
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How to get the top 10 values in postgresql?
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For this you can use limit
select *
from scores
order by score desc
limit 10
If performance is important (when is it not ;-) look for an index on score.
Starting with version 8.4, you can also use the standard (SQL:2008) fetch first
select *
from scores
order by scor...
What's the difference between streams and datagrams in network programming?
...the server. There is a guarantee that data will not arrive in a different order than you sent it, and there is a reasonable guarantee that data will not be damaged.
A datagram socket is like passing a note in class. Consider the case where you are not directly next to the person you are passing t...
A 'for' loop to iterate over an enum in Java
...se of lambda and streams (Tutorial):
Stream.of(Direction.values()).forEachOrdered(System.out::println);
Why forEachOrdered and not forEach with streams ?
The behaviour of forEach is explicitly nondeterministic where as the forEachOrdered performs an action for each element of this stream, in t...
Retrieving the last record in each group - MySQL
...TH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is the original answer I wrote for this question in 2009:
I write the solution this way:
SELECT m1.*
FROM messages m1 LEFT...
Sorting a vector of custom objects
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Edit2: As Kappa suggests you can also sort the vector in the descending order by overloading a > operator and changing call of sort a bit:
struct MyStruct
{
int key;
std::string stringValue;
MyStruct(int k, const std::string& s) : key(k), stringValue(s) {}
bool operator...
How can I retrieve Id of inserted entity using Entity framework? [closed]
...here in-case people are looking to "solve" the problem I had.
Consider an Order object that has foreign key relationship with Customer. When I added a new customer and a new order at the same time I was doing something like this;
var customer = new Customer(); //no Id yet;
var order = new Order();...