About the value of encoding used to store an unlimited hierarchical tree structure of the database table design, here is detail. Here I tried to use relatively short text, few graphics, and related core sql statement to describe the design: First, we
The principle of building a database table Database table and field names, design SQL Optimization - Index Set the table for a field (in oracle example) For any field length should not be too stingy, or unknown cause before and after the change sets
Article Design of the database table structure 2008-05-29 17:51 As described in this article title, just like to talk about the design of the database table itself, also referred to the relevant table structure and the performance and scalability pro
Sometimes we want to know the value of a value from the database, which tables and which fields, the Internet search, I found a better way, implemented through a stored procedure. Only need to pass a value you want to search, you can check out the va
3.2 Constraints (key) The development of the database table, the constraint is essential for the support, the use of constraint can better guarantee the integrity of data in the database 3.2.1 Classification of constraints in practice, constraints ar
Jbpm the process definition and process execution will be persisted to the database, so we need to create the required database, database tables, database tables to create the following three ways. 1. Manually create <br /> after decompression in th
Modify the database table update problem The process of doing the project, due to changes in customer demand, the project process should be done accordingly with the changes. I remember one time the project is based on cakephp framework mysql databas
PowerDesigner generates a database table using SQL script building, especially Oracle database, the table name with quotation marks generally. In fact, the quotes are PL / SQL specification, the database will be strictly in accordance with the ""