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Q: Who decides on the proper placement of fields and defines the relationships among data?
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What do you mean about schema in RDBMS?

In a relational database, the schema defines the tables, the fields in each table, and the relationships between fields and tables.


Why do you require a RegNo field in MS-access when you already have RollNo field?

That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.That question cannot really be answered, as it is down to the data you have and the database you are trying to design. You may well need these fields and have one as a primary key and have another field unique. To properly design a database, a lot of thought has to go into it, especially if there is more than one table and there are relationships. Even for one table you would work out what fields you need and how you design them. So you may have a requirement for both of those fields. It is your design, not Access itself, that decides what fields you need.


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