Discussion
Which one of the following is used to define the structure of the relation ,deleting relations and relating schemas ?
Answer: B
Correct answer: DDL(Data Definition Langauge)
Defining a relation's structure, deleting relations and relating schemas are all structural operations, and they belong to the Data Definition Language - CREATE, ALTER and DROP.
DML works on the data those structures hold. A query is one DML statement rather than a language, and a relational schema is the description DDL produces, not the means of producing it. A practical consequence of the split: in most engines DDL commits implicitly and cannot be rolled back.
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