hi there.
in our class (not really databases) we are asked to do a piece of coursework which involves entity relationship etc... and identifying key table names and fields etc...
now - if there is a many to many relationship in our diagram we have to somehow split it up so its a 1 to many - another entity is made to join the 2 tables together.
i found one - Manufacturing Run and Gas container are a Many to Many - so i split them up to a Table called Usage.
as for the entry fields - what should be in it?
it would contain (i assume)
Manufacturing Run (which is in the Manufacturing table)
Container No (which is in the Gas Container table)
..
..
what else?
as for the Gas component table - i have these fields:
Container No.
Specification
Capacity
Critical Pressure Limit
Container Name
would this do? or do i also have to put in the Manufacturing Run No.? - i dont think i do hence why we have the usage table to link them up
correct?
Thanks
in our class (not really databases) we are asked to do a piece of coursework which involves entity relationship etc... and identifying key table names and fields etc...
now - if there is a many to many relationship in our diagram we have to somehow split it up so its a 1 to many - another entity is made to join the 2 tables together.
i found one - Manufacturing Run and Gas container are a Many to Many - so i split them up to a Table called Usage.
as for the entry fields - what should be in it?
it would contain (i assume)
Manufacturing Run (which is in the Manufacturing table)
Container No (which is in the Gas Container table)
..
..
what else?
as for the Gas component table - i have these fields:
Container No.
Specification
Capacity
Critical Pressure Limit
Container Name
would this do? or do i also have to put in the Manufacturing Run No.? - i dont think i do hence why we have the usage table to link them up
correct?
Thanks
