如何在一个iOS应用程序查询中从单个sqlite数据库的多个表中获取数据？

Question

I'm working on an application where i need to get the details from sqlite database.
The database consists of multiple tables. I need to pass a global id to fetch the records related to one another in the database from multiple tables (like a relational database)

I don't know how to fetch the related records from database and display it in a master detail table controller.

Please provide with possible solution

Answer 1

For example lets say you got Table1 with fields x1, x2, x3, a . say you got Table2 contains your id(global id) g , and a foreign key relation with Table1's field ' a ' and its field z1, z2, z3.

Table1--->x1, x2, x3, a
Table2--->g, z1, z2, z3, a

Now we are gonna fetch the contents of Table1 based on the id 'g' of Table2.

SELECT t1.x1, t2.x2, t3.x3, t3.a FROM Table t1, Table t2 WHERE t1.a = t2.a AND t2.g = g

In "t2.g = g" 'g' is the global id you are holding. good luck in learning joints.