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MySQL - UPDATE query based on SELECT Query
...:
MySQL update join syntax:
UPDATE tableA a
INNER JOIN tableB b ON a.name_a = b.name_b
SET validation_check = if(start_dts > end_dts, 'VALID', '')
-- where clause can go here
ANSI SQL syntax:
UPDATE tableA SET validation_check =
(SELECT if(start_DTS > end_DTS, 'VALID', '') AS validat...
Dependency graph of Visual Studio projects
...uild/2003" }
$projectFiles | ForEach-Object {
$projectFile = $_ | Select-Object -ExpandProperty FullName
$projectName = $_ | Select-Object -ExpandProperty BaseName
$projectXml = [xml](Get-Content $projectFile)
$projectReferences = $projectXml | Select-Xml '//def...
Convert seconds to Hour:Minute:Second
...
here you go
function format_time($t,$f=':') // t = seconds, f = separator
{
return sprintf("%02d%s%02d%s%02d", floor($t/3600), $f, ($t/60)%60, $f, $t%60);
}
echo format_time(685); // 00:11:25
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MySQL Orderby a number, Nulls last
...ASC.
A good reference is here http://troels.arvin.dk/db/rdbms#select-order_by
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Configure Microsoft.AspNet.Identity to allow email address as username
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The C# version of this (in App_Code\IdentityModels.cs) is
public UserManager()
: base(new UserStore<ApplicationUser>(new ApplicationDbContext()))
{
UserValidator = new UserValidator<ApplicationUser>(this) { AllowOnlyAlphan...
Hidden Features of MySQL
...he SQL queries to guide MySQL to execute them faster.
Administration:
max_connections is the number of concurrent connections. The default value is 100 connections (151 since 5.0) - very small.
Note:
connections take memory and your OS might not be able to handle a lot of connections.
MySQL b...
How do I check if a string contains a specific word?
...ucts like !strpos($a, 'are').
Edit:
Now with PHP 8 you can do this:
if (str_contains('How are you', 'are')) {
echo 'true';
}
RFC
str_contains
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How to reset sequence in postgres and fill id column with new data?
...ich explains the ALTER SEQUENCE command ... so I changed 'seq' by mytable_id_seq where 'mytable' is my table name and 'id' is the name of my serial column
– Javi
May 4 at 9:19
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How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
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Click on the «Browser» tab, expand the design (probably called Untitled_1), right-click «Relational Models» and select «New Relational Model».
Right click on the newly created relational model (probably Relational_1) and select «Show».
Then just drag the tables you want (from e.g. the «Co...
Windows x64编程中寄存器的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
... DWORD dwReadSize;
hFile = CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
... ...
}
CreateFile() 的参数有 7 个，那么看看 VC 是怎样安排参数传递：
void EditTextFile(HWND hEdit, LPCTSTR szF...