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
In short, C# throws me \"Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information\", while the table in question DOES have
I\'m having problems with adding another primary key to my table. I have 3 columns: Account ID (I开发者_StackOverflow中文版dentity)
Why should I choose UUID over an auto increment number for my entity\'s primary 开发者_JAVA百科key? What are the pros and cons?Andrey and Mjg both had good points, but I would add a related performanc
I have a table on Sql Server 2005 database. The primary key field of the table is a code number. As a standard, the code must contain exactly 4 numeric digits. For example: 1234, 7834, ...
I am building a distributed application on top of Java and Cassandra. To generate unique sequential 32bit & 64 bit IDs, is an approach like using Flickr\'s ticket servers to generate primary IDs,
I need to merge parallel tables from 2 different schemas. They are practically the same (some fields are different), but the IDs (their PKs) are different.
We have an application which stores its data in SQL Server.Each table has a bigint primary key.We used to generate these exclusively on demand, i.e. when you go to insert a new row, you first make a c
I would like to convert some of our MyISAM tables to InnoDB so I can take advantage of foreign key support.However, most of the tables use a two-column (composite) primary key design in which one of t
How to find out if a开发者_开发技巧 column is an auto increment field in oracle?You can\'t. Oracle doesn\'t have auto-increment fields.
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