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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)
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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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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'm just wondering why you would go to the trouble of specifying relationships between tables.
Is it just for referential integrity?
Ensuring integrity ON THE SERVER has several obvious advantages I can think of:
- it will always be faster than if done by the client (no roundtrips)
- it will protect against developer errors
- you can't always control which client connects to your data
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Please let me know how to insert images and videos to table using SQLDeveloper.
You don't.
You can insert images or videos into an Oracle Database. You'll need a database, and a table, and at least one column setup to store your media. One way to do this is with Oracle Secure Files and the Binary Large Object Types (BLOB)
Once they're in the table, you can retrieve and update them in the client tools and applications, including SQL Developer.
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Im wondering for what the SQL database project template exists. I have created one and inserted a table with some col. Now i saved that, so i want to write Into that mdf-file Form a Windows forms project. I dont know how to acces that or even if this SQL project template is ment for that sort of usage. Is this a good solution for a local database?
Sry for that kind or basic question
The database project exists so that you can store the database structure in source control, generate and deploy the database (or upgrade scripts).