unique-index

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How do you give your users a unique ID without using the primary key in the database?

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?[详细]

2023-02-10 14:03 分类：问答
MySQL unique index by multiple fields

We have a special kind of table in our DB that stores the history of its changes in itself. So called \"self-archived\" table:[详细]

2023-02-05 17:50 分类：问答
MVC 2 Unique index validation

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[详细]

2023-01-31 05:37 分类：问答
MongoDB : ensureIndex not working on both single key and composite keys

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 :([详细]

2023-01-25 19:46 分类：问答
UNIQUE argument for INDEX creation - what's for?

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,[详细]

2023-01-17 21:17 分类：问答
Which approach is better for this scenario?

We have the following table: CREATE TABLE [dbo].[CampaignCustomer]( [ID]开发者_StackOverflow社区 [int] IDENTITY(1,1) NOT NULL,[详细]

2023-01-12 21:53 分类：问答
Hibernate throws unique constraint violation exception while updating field part of unique key

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.[详细]

2023-01-12 02:07 分类：问答
Unique Constraint vs Unique Index

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[详细]

2023-01-08 17:12 分类：问答
Rails uniqueness constraint and matching db unique index for null column

I have the following in my migration file def self.up create_table :payment_agreements do |t| t.boolean:automatic, :default => true, :null => false[详细]

2023-01-01 03:12 分类：问答
Check if Database raises a particular exception

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.[详细]

2022-12-25 16:05 分类：问答