If I have 10,000 users and the primary key is a unique ID going from 1 to 10,000, is there a way to give them all a unique ID such that the original primary key cannot be inferred from it?
We have a special kind of table in our DB that stores the history of its changes in itself. So called \"self-archived\" table:
Is there a way to validate a property that should be unique on a model? For example, a user can create and edit a \"Product\", but they shouldn\'t be able to create a Product with an existing ProductC
From hours I\'m trying to add bulk data in my locally setup MongoDB collection, all is set except unique index for a key or keys :(
Why does INDEX creation statement have UNIQUE argument? As I understand, the non-clustered index contains a bookmark, a pointer to a row,which should be unique to distinguish even non-unique rows,
We have the following table: CREATE TABLE [dbo].[CampaignCustomer]( [ID]开发者_StackOverflow社区 [int] IDENTITY(1,1) NOT NULL,
Below is the use case: I have a unique index defined on 3 columns say A,B,C. Assume the values in them are A1,B1,C开发者_StackOverflow1.
I’m interested in learning which technique developers prefer to use to enforce uniqueness in SQL Server:UNIQUE CONSTRA开发者_运维百科INT or UNIQUE INDEX.Given that there is little difference in the p
I have the following in my migration file def self.up create_table :payment_agreements do |t| t.boolean:automatic, :default => true, :null => false
using Nhibernate;开发者_C百科 I\'m trying to insert several values a on table which has an unique index on some columns.
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