Answer :

The distribution of people according to their occupation is called as structural occupation.in india about 64% are engaged in agriculture and 13% in secondary sector followed by 20% in tertiary sector.many people shift there occupations from primary to other sectors.this is because of growing urbanisation and industrialisation.
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Occupational structure means the distribution of working population among different occupations.
there are 3 types of occupational structures.

1.Primary occupational structure : it includes the people working in agriculture,mining,fishing and other linked activities, it is about 60%

2.Secondary occupational structure : it includes people working in industries both large scale and small scale. it is about 20%

3. Teritary occupational structure : it include banking,hotels,computers, defence ,education etc.. it is about 20%.