嵌套大小写错误：输入不匹配'；AS'；预期功率端在'附近；结束'；在case表达式中：Hive

我想在蜂箱里执行这个案子

select case when (hour(rand_date)>=0 and hour(rand_date)<6) then 'early_morning' else 
case when (hour(rand_date)>=6 and hour(rand_date)<12) then 'morning' else 
case when (hour(rand_date)>=12 and hour(rand_date)<18) then 'afternoon' else
case when (hour(rand_date)>=18 and hour(rand_date)<24) then 'night' else 'other' end AS hourbins,
 rand_date from mock_ads_dates ;

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选择case when（hour（rand_date）>=0和hour（rand_date）=6和hour（rand_date）=12和hour（rand_date）=18和hour（rand_date）
嵌套case语句在
配置单元中有点棘手。它应该是这样的：-

select case when (hour(rand_date)>=0 and hour(rand_date)<6) then 'early_morning' 
when (hour(rand_date)>=6 and hour(rand_date)<12) then 'morning'
when (hour(rand_date)>=12 and hour(rand_date)<18) then 'afternoon'
when (hour(rand_date)>=18 and hour(rand_date)<24) then 'night' else 'other' end AS hourbins,rand_date from mock_ads_dates ;

选择以下情况：小时（随机日期）>=0，小时（随机日期）=6，小时（随机日期）=12，小时（随机日期）=18，小时（随机日期）