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36 - 按分类统计薪水
-- 方法一
select'Low Salary' category,sum(income <20000) accounts_count
fromAccounts
union
select'Average Salary' category,sum(income between 20000 and 50000) accounts_count
fromAccounts
union
select'High Salary' category,sum(income>50000) accounts_count
fromAccounts ;-- 方法二select'Low Salary' category,count(*) accounts_count
fromAccounts
whereincome <20000
union
select'Average Salary' category,count(*) accounts_count
fromAccounts
whereincome between 20000 and 50000
union
select'High Salary' category,count(*) accounts_count
fromAccounts
whereincome>50000;
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