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_________ is not a DDL command.
  • a)
    Drop
  • b)
    Alter
  • c)
    Update
  • d)
    None of the above
Correct answer is option 'C'. Can you explain this answer?
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_________ is not a DDL command.a)Dropb)Alterc)Updated)None of the abov...
Key Points
  • DDL stands for Data Definition Language.
  • DDL commands are used to define and modify the structure of a database, such as creating or removing tables and specifying the data types of columns.
  • Update is a DML (Data Manipulation Language) command.
  • DML commands are used to manipulate the data within a database, such as inserting, updating, and deleting records.
  • The other options (Drop, Alter, Create) are all DDL commands.
Breakdown of all the options:
  • Drop: This command removes a database object, such as a table.
  • Alter: This command modifies the structure of an existing database object.
  • Update: This command modifies the data within a table. (Not a DDL command it is DML command)
  • Create: This command creates a new database object, such as a table.
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Consider a simple graph with unit edge costs. Each node in the graph represents a router. Each node maintains a routing table indicating the next hop router to be used to relay a packet to its destination and the cost of the path to the destination through that router. Initially, the routing table is empty. The routing table is synchronously updated as follows. In each updation interval, three tasks are performed.i. A node determines whether its neighbours in the graph are accessible. If so, it sets the tentative cost to each accessibleneighbour as 1. Otherwise, the cost is set to .ii. From each accessible neighbour, it gets the costs to relay to other nodes via that neighbour (as the next hop).iii. Each node updates its routing table based on the information received in the previous two steps by choosing the minimum cost.For the graph given above, possible routing tables for various nodes after they have stabilized, are shown in the following options. Identify the correct table.

Consider a simple graph with unit edge costs. Each node in the graph represents a router. Each node maintains a routing table indicating the next hop router to be used to relay a packet to its destination and the cost of the path to the destination through that router. Initially, the routing table is empty. The routing table is synchronously updated as follows. In each updation interval, three tasks are performed. A node determines whether its neighbours in the graph are accessible. If so, it sets the tentative cost to each accessible neighbour as 1. Otherwise, the cost is set to ∞. From each accessible neighbour, it gets the costs to relay to other nodes via that neighbour (as the next hop). Each node updates its routing table based on the information received in the previous two steps by choosing the minimum cost.For the graph given above, possible routing tables for various nodes after they have stabilized, are shown in the following options. Identify the correct table.

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_________ is not a DDL command.a)Dropb)Alterc)Updated)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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