As i said in another topic, im a beginner with databases and this is actually something to test myself into making a database, its like a system for a shop, ill choose a type of Monitor, Computer case and keyboard (one of each) to make it into a full Pc showing the total price.
I got a database connected to lazarus with workbench, so far i got three tables (Monitor, Computer case and Keyboard) each one with an id and a price, these three tables work into making another table (PC) that combines those 3 Id's, but now i want to also sum up the prices of the 3 components and make a total price in the PC table but i can't find how to code it out..
Ps. Im using Data controls (TDBGrids, TDBLLookupComboBoxes, etc) to show those tables data.