用sql语句实现年龄分段统计

SELECT CASE WHEN (age >= 10 AND age <= 20) THEN '10-20' WHEN (age >= 21 AND age <= 30) THEN '21-30' ELSE '30-' END 'eag_layer', count(*) emps FROM address_book GROUP BY CASE WHEN (age >= 10 AND age <=

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