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Query EC2 tags from within instance
...ol (to retrieve your instance ID) and the new Tag API to retrieve the tags for the current instance.
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How do I drop a foreign key constraint only if it exists in sql server?
...r. However, it will find constraints on any table. If you want to 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')
)
ALT...
Rails :include vs. :joins
...y was changed with Rails 2.1. Rails used to do the join in all cases, but for performance reasons it was changed to use multiple queries in some circumstances. This blog post by Fabio Akita has some good information on the change (see the section entitled "Optimized Eager Loading").
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How to get the data-id attribute?
...data-id attribute? I'm using the .on() method to re-bind the click event for sorted items.
15 Answers
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How to implement the activity stream in a social network
...ound on the web examples of implementation the stream of users' actions... For example, how to filter actions for each users? How to store the action events? Which data model and object model can I use for the actions stream and for the actions itselves?
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jquery IDs with spaces
...rrible HTML via ajax and have no control over the structure of the HTML or format of the IDs. Their IDs have spaces in them, so Elliot's answer helps tremendously, whereas glavic's offers no help at all.
– daybreaker
Jun 27 '11 at 18:59
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How to check which locks are held on a table
...o add to the other responses, sp_lock can also be used to dump full lock information on all running processes. The output can be overwhelming, but if you want to know exactly what is locked, it's a valuable one to run. I usually use it along with sp_who2 to quickly zero in on locking problems.
Th...
How to use GROUP BY to concatenate strings in SQL Server?
...LE loop, or User-Defined Function needed.
Just need to be creative with FOR XML and PATH.
[Note: This solution only works on SQL 2005 and later. Original question didn't specify the version in use.]
CREATE TABLE #YourTable ([ID] INT, [Name] CHAR(1), [Value] INT)
INSERT INTO #YourTable ([ID],[N...
How to copy a row and insert in same table with a autoincrement field in MySQL?
... You could programatically get then names of the columns using INFORMATION_SCHEMA ... I wonder if you could do it as a sub-query and some string functions? Hmmm...
– Yzmir Ramirez
Feb 6 '12 at 6:35
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When to add what indexes in a table in Rails
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Should I add "index" to all the foreign keys like "xxx_id"?
It would be better, because it accelerates the search in sorting in this column. And Foreign keys are something searched for a lot.
Since Version 5 of rails the index will be created automatical...