unique-key

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Update Unique keys in Entity Framework

I have one view and one of its fields is Email (UK-Unique Key). When some user do login in my web system and update the email. Happens one problem he can\'t change his email.[详细]

2023-03-16 15:57 分类：问答
Objects to strings, unique keys in PHP

I was reading around about the Observer pattern, and found a dated article. Having read through, I noticed an interesting mention in this paragraph:[详细]

2023-03-13 00:35 分类：问答
Fluent NHibernate 3 uniquekey custom constraint name

I am trying to give a custom Unique Constraint Name as follows: Map(x => x.Name).UniqueKey(\"MY_CONSTRAINT_NAME\").Column(\"FUNCTION_NAME\");[详细]

2023-03-09 23:30 分类：问答
UNIQUE KEY in any order

I am using UNIQUE KEY for MYSQL for one table. However, I have a table which has \"user1,user2\". I created a UNIQUE KEY but the problem is I want the UNIQUE KEY to act whether \"user1==user1 &&am[详细]

2023-03-09 07:29 分类：问答
Primary key and unique key in django

I had a custom primary key that need to be set up on a particular data in a model. This was not enough, as an attempt to insert a duplicate number succeeded. So now when i replace primary_key=True t[详细]

2023-03-06 11:43 分类：问答
How to make a field value unique in Entity Framework

I have a table with a key and another field named \"Card开发者_运维问答Id\" . Now I want to make CardId unique. I mean just unique value should be store in CardId.[详细]

2023-02-20 23:35 分类：问答
MySQL: ALTER IGNORE TABLE ADD UNIQUE, what will be truncated?

I have a table with 4 columns: ID, type, owner, description. ID is AUTO_INCREMENT PRIMARY KEY and now I want to:[详细]

2023-02-20 09:49 分类：问答
MySQL INSERT if one of primary key value doesn't match

I would like to do MySQL query like this: if((value1 != dbPrimaryValue1) OR (value2 != dbPrimaryValue2))[详细]

2023-02-19 04:57 分类：问答
Pros/Cons of and ways to implement globally unique identifier in relational database?

Regarding the first part of my question: I was recently asking myself what are the benefits and trade-offs of having a unique identifier for certain tables in a relational database. Just as an example[详细]

2023-02-15 20:49 分类：问答
Unique serial number using php/javascript

Is there a way to get a unique serial number for machines such as Mac,Windows and devices such as iPhone,Blackberry us开发者_如何学JAVAing php/javascript?It really requires at least one reference datu[详细]

2023-02-15 19:08 分类：问答