how can i write create store procedure that will add an ingredient to a recipe. The procedure should accept at a minimum the recipe name or ID, ingredient name or ID, ingredient quantity, and ingredient unit.
If the ingredient already exists, update the quantity; an error should occur if the new ingredient and quantity are the same. A return code of 0 should indicate success and -1 if an error was encountered.
Make use of an output parameter that contains a semi-colon separated list of ingredient name and units. The value should be structured similar to the following:
2 cups white sugar;1/2 cup butter;1/2 cup milk;3 tablespoons cocoa powder
Include at the bottom of the same file, SQL code that will execute the procedure and print or select the error code and ingredient list (output parameter).