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To delete a particular column in a relation which command is used ?
To delete a particular column in a relation ALTER command is used.
What are the physical characteristics of magnetic disks? Ans: A magnetic disk is a circular plate or platter of plastic or metal that is coated with magnetizable material lik
What are the storage types? The storage types are: a) Volatile storage b) Nonvolatile storage
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
What is advantage of two-way association? Two-way association advantages are following: a) Independent of the classes. b) Useful for existing predefined classes that are
MySQL Database Merge Project Description: I have two databases, I need merge the data of one database into another Work to be done online right now. Payment can be done
Define single valued and multivalued attributes. Single valued attributes: attributes with a single value for a particular entity are known as single valued attributes. Mult
Concurrency Identification While designing analysis, model we map real world model into our analytical model. Real life objects are simultaneous in nature, but all the design
What is the archtetype/instance pattern? The archetype/instance pattern happens when one entity tracks occurrences of another entity. A common example is the relationship among
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
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