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Updating a relational database php

updating a relational database php-2

With a procedural language we can start at the bottom of the tree and iterate upwards to return the full tree or a single path.We can also use procedural programming to delete nodes without orphaning entire sub-trees by promoting one child element and re-ordering the remaining children to point to the new parent.

14) Integrates with Java: SQL integrates with Java by using an API known as JDBC (Java Database Connectivity).12) Supports object based programming: SQL supports the latest object based programming and is highly flexible.13) Supports enterprise applications: SQL is the database language which is used by businesses and enterprises throughout the globe.Typically the example categories shown above will be stored in a table like the following (I’m including full CREATE and INSERT statements so you can follow along): CREATE TABLE category( category_id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(20) NOT NULL, parent INT DEFAULT NULL ); INSERT INTO category VALUES(1,'ELECTRONICS', NULL),(2,'TELEVISIONS',1),(3,'TUBE',2), (4,'LCD',2),(5,'PLASMA',2),(6,'PORTABLE ELECTRONICS',1),(7,'MP3 PLAYERS',6),(8,'FLASH',7), (9,'CD PLAYERS',6),(10,'2 WAY RADIOS',6); SELECT * FROM category ORDER BY category_id; ------------- ---------------------- -------- | category_id | name | parent | ------------- ---------------------- -------- | 1 | ELECTRONICS | NULL | | 2 | TELEVISIONS | 1 | | 3 | TUBE | 2 | | 4 | LCD | 2 | | 5 | PLASMA | 2 | | 6 | PORTABLE ELECTRONICS | 1 | | 7 | MP3 PLAYERS | 6 | | 8 | FLASH | 7 | | 9 | CD PLAYERS | 6 | | 10 | 2 WAY RADIOS | 6 | ------------- ---------------------- -------- 10 rows in set (0.00 sec).While the adjacency list model can be dealt with fairly easily in client-side code, working with the model can be more problematic in pure SQL.Working with the adjacency list model in pure SQL can be difficult at best.

Before being able to see the full path of a category we have to know the level at which it resides.

Ferment Id FROM FERMENT INNER JOIN [BELGIUM BEER] ON FERMENT.

In this case I would try something like this: UPDATE T SET T. FERMENTID FROM EXAMPLETABLE AS T INNER JOIN (SELECT FERMENT. OTHERID FROM FERMENT INNER JOIN [BELGIUM BEER] ON FERMENT.

For our purposes, hierarchical data is a collection of data where each item has a single parent and zero or more children (with the exception of the root item, which has no parent).

Hierarchical data can be found in a variety of database applications, including forum and mailing list threads, business organization charts, content management categories, and product categories.

Below given are the pros, advantages of Structured Query Language (SQL): 1) Portable: SQL is run in programs in mainframes, PCs, laptops, servers and even mobile phones. Databases using SQL can be moved from device to another without any problems.