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提交日期 题目名称 提交代码
2025-01-20 子查询(1)玩的最嗨那天在做甚?要用Where子查询 
select * from cmb_usr_trx_rcdwhere trx_amt = (select max(trx_amt) from cmb_usr_trx_rcd where trx_time like '2024%' and usr_id = '5201314520' )
2025-01-20 子查询(1)玩的最嗨那天在做甚?要用Where子查询 
select * from cmb_usr_trx_rcdwhere trx_amt = (select max(trx_amt) from cmb_usr_trx_rcd where year(trx_time) = '2024' and usr_id = '5201314520' )
2025-01-20 GROUP BY-各班级人数 
select distinct class_code , count(*) as student_count from studentsgroup by class_code order by student_count desc
2025-01-20 CASE WHEN-老中青教师数量 
select distinct case when enter_date >= '2010-01-01' then '青年教师' when enter_date <= '2000-01-01' then '资深教师' else '中年教师' end as teacher_type ,count(*) as teacher_count
from teachersgroup by teacher_type
2025-01-20 字符串与通配符(2)好多关键词做规则,可以使用rlike 
selectcase when mch_nm like '%按摩保健休闲%' then '按摩保健休闲' when lower(mch_nm) rlike '.*(按摩|保健|休闲|养生|SPA|会所).*' then '按摩、保健、休闲、养生、SPA、会所' end as reg_rules , count(distinct mch_nm) as mch_cnt
from cmb_usr_trx_rcd where mch_nm like '%按摩保健休闲%' or lower(mch_nm) rlike '.*(按摩|保健|休闲|养生|SPA|会所).*' 
group by reg_rules order by mch_cnt desc
2025-01-20 字符串与通配符(2)好多关键词做规则,可以使用rlike 
selectcase when mch_nm like '%按摩保健休闲%' then '按摩保健休闲' when lower(mch_nm) rlike '.*(按摩|保健|休闲|SPA|养生|会所).*' then '按摩、保健、休闲、SPA、养生、会所' end as reg_rules , count(distinct mch_nm) as mch_cnt
from cmb_usr_trx_rcd where mch_nm like '%按摩保健休闲%' or lower(mch_nm) rlike '.*(按摩|保健|休闲|SPA|养生|会所).*' 
group by reg_rules order by mch_cnt desc
2025-01-20 字符串与通配符(2)好多关键词做规则,可以使用rlike 
selectcase when mch_nm like '%按摩保健休闲%' then '按摩保健休闲' when lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*' then '按摩、保健、休闲、spa、养生、会所' end as reg_rules , count(distinct mch_nm) as mch_cnt
from cmb_usr_trx_rcd where mch_nm like '%按摩保健休闲%' or lower(mch_nm) rlike '.*(按摩|保健|休闲|spa|养生|会所).*' 
group by reg_rules order by mch_cnt desc
2025-01-20 字符串与通配符(2)好多关键词做规则,可以使用rlike 
select * from cmb_usr_trx_rcd
2024-11-22 字符串与通配符(1)名称里面有特服,可以使用通配符 
select count(distinct mch_nm) as mch_cnt from cmb_usr_trx_rcd where mch_nm like "%按摩保健休闲%"
2024-11-22 分类(1)姿势太多很过分,分类要用CaseWhen 
select case when trx_amt = 288 then "1.WithHand" when trx_amt = 388 then "2.WithMimi" when trx_amt = 588 then "3.BlowJobbie" when trx_amt = 888 then "4.Doi" when trx_amt = 1288 then "5.DoubleFly" else "6.other" end as ser_typ , count(1) as trx_cnt ,min(date(trx_time)) as first_date from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" group by ser_typ order by 1
2024-11-22 分类(1)姿势太多很过分,分类要用CaseWhen 
select case when trx_amt = 288 then "1.WithHand" when trx_amt = 388 then "2.WithMimi" when trx_amt = 588 then "3.BlowJobbie" when trx_amt = 888 then "4.Doi" when trx_amt = 1288 then "5.DoubleFly" else "6.other" end as ser_typ , count(1) as trx_cnt ,min(trx_time) as first_date from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" group by ser_typ order by 1
2024-11-22 分类(1)姿势太多很过分,分类要用CaseWhen 
select
case when trx_amt=288 then '1.WithHand'
when trx_amt=388 then '2.WithMimi'
when trx_amt=588 then '3.BlowJobbie'
when trx_amt=888 then '4.Doi'
when trx_amt=1288 then '5.DoubleFly'
else '6.other'
end as ser_typ
,count(1) as trx_cnt
,min(date(trx_time)) as first_date
from 
cmb_usr_trx_rcd
where usr_id='5201314520' and mch_nm='红玫瑰按摩保健休闲'
group by ser_typ
order by 1
2024-11-22 分类(1)姿势太多很过分,分类要用CaseWhen 
select case when trx_amt = 288 then "1.Withhand" when trx_amt = 388 then "2.WithMimi" when trx_amt = 588 then "3.BlowJobbie" when trx_amt = 888 then "4.Doi" when trx_amt = 1288 then "5.DoubleFly" else "6.other" end as ser_typ , count(1) as trx_cnt ,min(trx_time) as first_date from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" group by ser_typ order by 1
2024-11-22 分类(1)姿势太多很过分,分类要用CaseWhen 
select case when trx_amt = 288 then "1.WithHand" when trx_amt = 388 then "2.WithMimi" when trx_amt = 588 then "3.Blowjobbie" when trx_amt = 888 then "4.Doi" when trx_amt = 1288 then "5.DoubleFly" else "6.other" end as ser_typ , count(1) as trx_cnt ,min(trx_time) as first_date from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" group by ser_typ order by 1
2024-11-22 分类(1)姿势太多很过分,分类要用CaseWhen 
select case when trx_amt = 288 then "1.WithHand" when trx_amt = 388 then "2.WithMimi" when trx_amt = 588 then "3.Blowjobbie" when trx_amt = 888 then "4.Doi" when trx_amt = 1288 then "5.DoubleFly" else "6.other" end as ser_typ , count(1) as trx_cnt ,min(trx_time) as first_date from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" group by ser_typ order by 2 desc
2024-11-22 分类(1)姿势太多很过分,分类要用CaseWhen 
select case when trx_amt = 288 then "1.WithHand" when trx_amt = 388 then "2.WithMimi" when trx_amt = 588 then "3.Blowjobbie" when trx_amt = 888 then "4.Doi" when trx_amt = 1288 then "5.DoubleFly" else "6.other" end as ser_typ , count(1) as trx_cnt ,min(trx_time) as first_time from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" group by ser_typ order by 1
2024-11-22 分组与聚合函数(6)想知道渣男有多坏,疯狂使用GroupBy 
select usr_id,mch_nm,sum(trx_amt) as trx_amt ,count(trx_amt) as trx_cnt,min(trx_time) as first_time from cmb_usr_trx_rcd where usr_id = "5201314520" and trx_amt >=288 group by usr_id,mch_nm order by trx_cnt desc
2024-11-22 分组与聚合函数(6)想知道渣男有多坏,疯狂使用GroupBy 
select usr_id,mch_nm,sum(trx_amt) as trx_amt ,count(trx_amt) as trx_cnt,min(trx_time) as first_time from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" and trx_amt >=288 group by trx_amt order by trx_cnt desc
2024-11-22 分组与聚合函数(6)想知道渣男有多坏,疯狂使用GroupBy 
select usr_id,mch_nm,sum(trx_amt),count(trx_amt) as trx_cnt,min(trx_time) as first_time from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" and trx_amt >=288 group by trx_amt order by trx_cnt desc
2024-11-22 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select usr_id,min(trx_time) as first_time,mch_nm from cmb_usr_trx_rcd where usr_id = "5201314520" and mch_nm = "红玫瑰按摩保健休闲" group by usr_id,mch_nm