Question

I have the requirement to build a asp.net sign up form which will allow students to register a training. So far I built a database in sql server and 3 tables: student, training & studenttraining

My question is, how can I limit the form from displaying the dates available once a particular training gets full, or meabe how can I prevent by checking the tables that the user can register?

Answer 1

Select count(*) as SeatsFilled, t.TrainingKey, t.TrainingDate
From Training t
Inner Join StudentTraining st on t.TrainingKey = st.TrainingKey
Group By t.TrainingKey, t.TrainingDate
Having count(*) < t.TotalSeats

TotalSeats is a column in the Training table that specifies how many seats the training provides. I assumed StudentTraining is a many-to-many bridge table between Students and Training.