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How do I drop a foreign key constraint only if it exists in sql server?
...target a foreign key constraint on a specific table, use this:
IF EXISTS (SELECT *
FROM sys.foreign_keys
WHERE object_id = OBJECT_ID(N'dbo.FK_TableName_TableName2')
AND parent_object_id = OBJECT_ID(N'dbo.TableName')
)
ALTER TABLE [dbo.TableName] DROP CONSTRAINT [FK_TableName_TableName2]...
Cast List to List in .NET 2.0
...<int>(new int[] { 1,2,3 } );
List<string> s = (from i in items select i.ToString()).ToList();
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Installing Java 7 on Ubuntu
...ther JDK versions installed
sudo update-alternatives --config java
then select the Java 7 version.
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GROUP_CONCAT ORDER BY
...
You can use ORDER BY inside the GROUP_CONCAT function in this way:
SELECT li.client_id, group_concat(li.percentage ORDER BY li.views ASC) AS views,
group_concat(li.percentage ORDER BY li.percentage ASC)
FROM li GROUP BY client_id
...
What's a Good Javascript Time Picker? [closed]
... resources:
TimeDatePicker (jQuery Plugin)
jQuery.timepickr
jQuery.ptTimeSelect
Time Picker
Fancy Time Picker
NoGray Time Picker
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What is the difference between YAML and JSON?
...
Tabs are simply not allowed at all as indentation characters. IMHO, that is good coding style in all languages - with or without syntactic indentation.
– 00prometheus
Nov 15 '15 at 19:11
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When should I use a table variable vs temporary table in sql server?
... source for the data inserted to the table is from a potentially expensive SELECT statement then consider that using a table variable will block the possibility of this using a parallel plan.
If you need the data in the table to survive a rollback of an outer user transaction then use a table variab...
Database development mistakes made by application developers [closed]
... the log output from Hibernate and you'll see all the queries begin with:
SELECT DISTINCT ...
This is a bit of a shortcut to ensuring you don't return duplicate rows and thus get duplicate objects. You'll sometimes see people doing this as well. If you see it too much it's a real red flag. Not...
How to stop a goroutine
...a signal, it quits.
quit := make(chan bool)
go func() {
for {
select {
case <- quit:
return
default:
// Do other stuff
}
}
}()
// Do stuff
// Quit goroutine
quit <- true
...
How to paste yanked text into the Vim command line
...nto your buffer.
Let's decompose: " is a Normal mode command that lets you select what register is to be used during the next yank, delete or paste operation. So ": selects the colon register (storing last command). Then p is a command you already know, it pastes the contents of the register.
cf. :...