primary key redshift

I am a newbie. I have been confused for a long time. Today I decided to ask you the correct or common practices. Here is a simple example: id, title, content ,...... Label table: id. The two tables above the title obviously require auto-incrementing IDS as the primary key to ensure uniqueness. Design 1 next... I am a newbie. I am confused about this question for a long time. Today I decided to ask you the c

1, assignedThe primary key is generated by an external program and must be specified before save (). Hibernate is not responsible for maintaining primary key generation. It is independent of hibernate and the underlying database, and can be cross-database. Before storing the object, it is necessary to use the setter m

Primary key, Primarykey. Indexed, index. The primary key usually corresponds to a unique key. Primary key corresponds to a unique, which is essentially meaningless, but a constraint.How

The logical design of database is a very broad problem. In this paper, the main key design of the table is discussed in the design of MS SQL Server in the development application, and the corresponding solution is given. The status and problems of primary key design As for the primary

Meaningless primary key　 I stress that the primary key should not be of practical significance. This may not be recognized by some friends. For example, in the order table, there will be an "Order Number" field, in practice, this field should be unique and have a unique identification record function. However, we do no

Http://www.chenjiliang.com/Article/View.aspx? ArticleID = 6803 Maybe everyone has designed databases and tables and defined primary keys. Today I want to explain how to correctly design a primary key. In some previous documents, the primary key design principle is not mentio

IncrementGenerates an auto-grow primary key for a long, int, short data column. Used in the database to not set the table primary key to self-increment, but also want the table primary key self-incrementImplementation mechanism: M

http://blog.csdn.net/yerenyuan_pku/article/details/65462930Hibernate Persistence ClassWhat is a persistent class? The English name of the persistence class in Hibernate is Persistent Object (PO), PO=POJO+HBM mapping configuration file.For the PO in Hibernate, the following rules are written: You must provide a non-parametric public construction method. All attributes are to be decorated with private, providing public get/set methods externally. The PO class must provide an ident

Oracle Primary Key usage explanation, oracleprimary Oracle/PLSQL: Primary Key Usage1 goal The example shows how to create, delete, disable, and enable a primary key. 2 preface-what is a primar