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Retrieve Data From Multiple Tables Via Combo


I am working on a small project to create a single web page which retrieves data from 3 tables.

The first table is retrieved by a combo box. It only contains the primary key of the table. I know how to get the data in the combo.

The second table contains other information, related to the primary key of table 1. I know how to retrieve all the data, but not how to retrieve only the data of the selected primary key. I think I should work with a WHERE clause in the SELECT statement, but I have no idea how to get to the selected value.

The third table should work in a similar way, so when I have an answer for the second table, I can also use it for the third table.




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