unique-key

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MyISAM unique keys being cut off at 64 bytes, causing collisions

I\'ve got a MySQL table that stores urls as unique keys. I\'m starting to get collisions on my keys because it seems the keys themselves are only the first 64 bytes (or characters if you prefer, its a[详细]

2023-02-15 14:01 分类：问答
Multiple Unique Columns in SQLite

I am trying to create a table where I need it to NOT allow rows where 3 fields are the s开发者_运维问答ame.[详细]

2023-02-03 03:50 分类：问答
Unique key column order in fluent nhibernate

I try to create unique index with fluent nhibernate. But when i use the following classes tables are created like :[详细]

2023-02-02 01:52 分类：问答
Database; One or two unique fields?

I will use a field named ID; an integer primary key. Is it any point to also specify a second unique field, to be able to reconstruct the tables if some ID f开发者_如何学运维ields/relationships are me[详细]

2023-02-01 20:17 分类：问答
Fluent NHibernate issue with creating multi column unique index

I have the following fluent mapping set up for an entity: *Id(x => x.Id); References(x => x.UserNominee).UniqueKey(\"UQ_SurveyNominee\");开发者_开发技巧[详细]

2023-01-31 18:29 分类：问答
Math question regarding Python's uuid4

I\'m not great with statistical mathematics, etc. I\'ve been wondering, if I use the following: import uuid[详细]

2023-01-27 16:49 分类：问答
Add new keys to a dictionary while incrementing existing values

I am processing a CSV file and count开发者_如何学JAVAing the unique values of column 4. So far I have coded this three ways. One uses \"if key in dictionary\", the second traps the KeyError and the th[详细]

2023-01-22 20:09 分类：问答
MySQL Set NULLABLE Unique Field

I\'ve a case where I need to store twitter username, email, and some other field to be unique. However开发者_JAVA技巧, I can only set twitter username later. Not on registration process. How can I han[详细]

2023-01-20 07:30 分类：问答
rails relationship using unique key

Table/Entity 1: RetrievedDataRecords Columns: id record_key Table/Entity 2: SourceKeys Columns: id key_name (unique key)[详细]

2023-01-19 07:12 分类：问答
What should be the unique ID of a machine? Its motherboard ID? Windows Product ID?

I want to retrieve the unique ID of a machine. Like others I also did a lot of research, and found none of the process of Unique ID generation works perfectly.[详细]

2023-01-12 23:34 分类：问答