Present perfect or past simple? ( Part- I )
I Have done or I did ? The present perfect tells us about the past and the present. United have won the Cup, so it’s theirs now. The past simple
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Introduction The present perfect tells us about the past and the present. The aircraft has landed means that the aircraft is on the ground now. Form The present perfect is
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Introduction A reporter is interviewing Mike and Harriet. Reporter: Mike and Harriet, tell me what you saw. Harriet: Well, when we were driving home last night, we saw a strange
» Read moreDBMS Keys: Primary, Candidate, Super, Alternate and Foreign
What are Keys? A DBMS key is an attribute or set of an attribute which helps you to identify a row(tuple) in a relation(table). They allow you to find the
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For a huge database structure, it can be almost next to impossible to search all the index values through all its level and then reach the destination data block to
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We know that data is stored in the form of records. Every record has a key field, which helps it to be recognized uniquely. Indexing is a data structure technique
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