# What is the difference between relational tuple calculus and domain calculus?

Relational tuple calculus has its variables range over tuples, where domain relational calculus ranges its variables over the field values, or domain elements. Both types of calculus are subsets of first order logic.

### What are the main differences between relational algebra and relational calculus?

Relation algebra is a procedural language where relation calculus is non-procedural language Relational algebra, an offshoot of first-order logic (and of algebra of sets), deals with a set of finitary relations (see also relation (database)) which is closed under certain operators. These operators operate on one or more relations to yield a relation. Relational algebra is a part of computer science. Relational calculus consists of two calculi, the tuple relational calculus and the domain relational…

### How would you classify the relational algebra and relational calculus?

1. Relational algebra operations manipulate some relations and provide some expression in the form of queries where as relational calculus are formed queries on the basis of pairs of expressions. 2. RA have operator like join, union, intersection, division, difference, projection, selection etc. where as RC has tuples and domain oriented expressions. 3. RA is procedural language where as RC is non procedural query system. 4. Expressive power of RA and RC are equivalent. This…

### What is the difference between child domain additional domain server?

Answer: An additional domain controller would be just that, a new DC added to an existing Domain. A child DC would be either the first or an additional DC added to a child domain, i.e., a domain that has a parent domain in the same forest: Let us know we have a domain called wiki.com A child domain is abc.wiki.com or xyz.wiki.com. abc and xyz is a child name. to create this child doamin you…

### Difference between a hub and switch and router?

hub is a device which simply acts an amplifier it does not divides the broadcast domain and the collision domain as well switch on the other hand is a device which divides the collision domain but cannot divide the broadcast domain i.e a message sent from a server to a host A will be delivered to all the hosts connected in a network router divides broadcast domain as well as collision domain

### Difference between Primary domain controller and Additional domain controller?

The domain controller (DC) is the server that responds to security authentication requests (logging in, checking permissions, etc.) within the Windows Server domain. The additional domain controller or the backup domain controller is an alternate controller. It has now been effectively removed partially to emphasize the multi-master replication technology available in Windows

### What is the difference between a domain local group global group and a universal group?

Global Group: Members of Global Group can come only from local domain but members can access resources in any domain. Domain Local Group: Members of Local Group can come from any domain but members can access resources only in local domain. Universal Group: Members can come from any domain and members can access resource in any domain. Hope this is easy:)

### What is difference between additional controller and child domain controller?

A child domain controller creates a sub domain in your active directory tree. This is used as a security feature so a group of users can have separate, policies and limited or controlled access to the parent domain resources. An additional domain controller adds a secondary domain controller to the domain. It's recommended to have at least 2 domain controllers per domain to take advantage of the high availability features of Active Directory. Yogesh kumar