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An Alternate Key is any candidate key that is not selected as the primary key of the table. Candidate keys are attributes (or combinations of attributes) that uniquely identify a row in a table. Among these, one is chosen as the primary key, while others are considered alternate keys. For example, in a table of students, both StudentID and Email might uniquely identify records. If StudentID is the primary key, Email becomes an alternate key. Alternate keys are useful for additional indexing or as foreign keys in related tables. Why Other Options Are Incorrect :
The total number of abdominal legs in the larval stage of the mustard sawfly is ____.
………………….. is associated to achieve the goal of Sweet Revolution in country
Which one of the following is red in the adult of red hairy caterpillar?
Chili leaf curl disease is spread by vector_________
This leg type is observed in insects like the praying mantis, featuring spiny femurs and tibiae that interlock to form a gripping mechanism
Insects are classified into the phylum_______.
Shellac is secreted by
Which of the following is correctly matched ?
This toxin is derived from Bacillus thuringiensis, alters the ion permeability of the midgut epithelia in insects, leading to gut paralysis and death:
Pebrine disease of silkworm is caused by