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Postgresql GROUP_CONCAT equivalent?
...ROM data_table
GROUP BY id_field
array_agg returns an array, but you can CAST that to text and edit as needed (see clarifications, below).
Prior to version 8.4, you have to define it yourself prior to use:
CREATE AGGREGATE array_agg (anyelement)
(
sfunc = array_append,
stype = anyarray,
...
byte + byte = int… why?
...(int) x + (int) y;
So, there is no + operation on bytes, bytes are first cast to integers and the result of addition of two integers is a (32-bit) integer.
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Why does this code segfault on 64-bit architecture but work fine on 32-bit?
...
The cast to int* masks the fact that without the proper #include the return type of malloc is assumed to be int. IA-64 happens to have sizeof(int) < sizeof(int*) which makes this problem obvious.
(Note also that because of t...
How to get ALL child controls of a Windows Forms form of a specific type (Button/Textbox)?
...t; GetAll(Control control,Type type)
{
var controls = control.Controls.Cast<Control>();
return controls.SelectMany(ctrl => GetAll(ctrl,type))
.Concat(controls)
.Where(c => c.GetType() == type);
}
To test it in the for...
typecast string to integer - Postgres
...urther and restrict on this coalesced field such as, for example:-
SELECT CAST(coalesce(<column>, '0') AS integer) as new_field
from <table>
where CAST(coalesce(<column>, '0') AS integer) >= 10;
share...
Select n random rows from SQL Server table
...sOrderDetail table:
SELECT * FROM Sales.SalesOrderDetail
WHERE 0.01 >= CAST(CHECKSUM(NEWID(),SalesOrderID) & 0x7fffffff AS float)
/ CAST (0x7fffffff AS int)
The SalesOrderID column is included in
the CHECKSUM expression so that
NEWID() evaluates once per row to
achi...
How do I generate random number for each row in a TSQL Select?
...1.8b row table every day, so it was happening about once a week! Fix is to cast the checksum to bigint before the abs.
– EvilPuppetMaster
Jan 29 '16 at 1:11
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tinyxml XML解析库下载（tinyxml2.h 和 tinyxml2.cpp） - 源码下载 - 清泛...
...InternedStr( const char* str ) {
Reset();
_start = const_cast<char*>(str);
}
void SetStr( const char* str, int flags=0 );
char* ParseText( char* in, const char* endTag, int strFlags );
char* ParseName( char* in );
private:
void Reset();
void Col...
Why cast an unused function parameter value to void?
...
@Benoit what does casting to void actually do? Is its only function to show the compiler that you're intentionally ignoring something or does (void) actually do something and when the compiler sees it, it'll just count it as having done someth...
How to combine date from one field with time from another field - MS SQL Server
...oduced in SQL Server 2008. If you insist on adding, you can use Combined = CAST(MyDate AS DATETIME) + CAST(MyTime AS DATETIME)
Edit2 regarding loss of precision in SQL Server 2008 and up (kudos to Martin Smith)
Have a look at How to combine date and time to datetime2 in SQL Server? to prevent los...