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I know that Delta key is a column in SQL table that should be of datetime type. But what is the purpose of Delta key?
There is nothing like Delta key in SQL Server for sure. If you will check the MSDN you can confirm this. You might take a look at SQL Delta which I guess you might be looking for.
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is any scientific reason to create a table with self join and 1 to many relation in the same table >>>
what i need is explain why we can't do this
thanks for your time .
Yes, they are perfectly valid situations that need such relations.
For example when you store a Tree on a table. Each node will have links to its childs (through a ParentId column), so it will have a relation 1 to many with itself.
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there is any simple way to know which one of two SQL Store procedure works better?
Click the Include Actual Execution Plan before running both sp (on the same run) and check the percentages
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I know that SQL is different in various databases. But I need to know which functions are predicates in source SQL as language standart (not vendor solutions).
I found:
CONTAINS
EXISTS
IS NULL
IS NOT NULL
Is it all? Or did I lose smth?
Are all predicates use the TVL?
P.S. Sorry if I wrote stupidity, I'm a noobie in the database but I need to know it for exam.
You can refer here:
ANSI SQL Framework
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I am still learn SQL and I need to have table A sync'd to table B in a different DB. Does anyone have a script to do that or point me in the right direction.
Thanks
INSERT INTO current_DB.A
(SELECT * FROM another_DB.B)
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Hey guys. I have a quick question to understand what this means for my project. I am supposed to have my usernames be unique (and enforced at a database level). What does this mean when referring to database level? I am using ASP.net MVC5 with SQL Express as my database.
You are supposed to make certain only unique names are in the database, so you can look at this for more
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/f7ded633-5d66-4cda-a525-96ab97cee868/sqlexpress-create-unique-column
Basically do
Alter table users add constraint uniq_user unique(username)