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提交日期 题目名称 提交代码
2026-02-04 表连接（1）你们难道都去过？那就试试用InnerJoin  
SELECT a.mch_nm 
FROM cmb_usr_trx_rcd a
INNER JOIN (
SELECT mch_nm 
FROM cmb_usr_trx_rcd 
WHERE usr_id = '5211314521' 
AND YEAR(trx_time) = 2024 
) c ON a.mch_nm = c.mch_nm
WHERE a.usr_id = '5201314520' 
AND YEAR(a.trx_time) = 2024 
group by mch_nm
2026-02-04 表连接（1）你们难道都去过？那就试试用InnerJoin  
SELECT a.mch_nm 
FROM 
(SELECT DISTINCT mch_nm
 FROM cmb_usr_trx_rcd
 WHERE YEAR(trx_time) = 2024 AND usr_id = '5211314521') a
INNER JOIN
(SELECT DISTINCT mch_nm
 FROM cmb_usr_trx_rcd
 WHERE YEAR(trx_time) = 2024 AND usr_id = '5201314520') b
ON a.mch_nm = b.mch_nm
ORDER BY a.mch_nm DESC
2026-02-04 表连接（1）你们难道都去过？那就试试用InnerJoin  
select mch_nm from cmb_usr_trx_rcd where usr_id in ('5201314520','5211314521')
and year(trx_time)='2024'
group by mch_nm
2026-02-04 子查询（1）玩的最嗨那天在做甚？要用Where子查询  
select * from
cmb_usr_trx_rcd where trx_amt=
(
select max(trx_amt) from cmb_usr_trx_rcd where usr_id='5201314520' and year(trx_time)='2024')
and usr_id = '5201314520'
    and year(trx_time) = 2024;
2026-02-04 子查询（1）玩的最嗨那天在做甚？要用Where子查询  
select 
usr_id,mch_nm,trx_time,max(trx_amt) from cmb_usr_trx_rcd where usr_id='5201314520' and year(trx_time)='2024'
 group by usr_id,mch_nm,trx_time
 order by trx_time
2026-02-04 子查询（1）玩的最嗨那天在做甚？要用Where子查询  
select 
usr_id,mch_nm,trx_time,max(trx_amt) from cmb_usr_trx_rcd where usr_id='5201314520' and year(trx_time)='2024'
 group by usr_id,mch_nm,trx_time
2026-02-04 子查询（1）玩的最嗨那天在做甚？要用Where子查询  
select max(trx_amt) from cmb_usr_trx_rcd where usr_id='5201314520' and year(trx_time)='2024'
2026-02-01 条件过滤（1）异地男友有异常，数分闺蜜来帮忙  
select * from cmb_usr_trx_rcd where date(trx_time) between '2024-09-01' and '2024-09-30' and usr_id='5201314520'
2026-02-01 条件过滤（1）异地男友有异常，数分闺蜜来帮忙  
select * from cmb_usr_trx_rcd where date(trx_time) and usr_id='5201314520'
2026-02-01 条件过滤（1）异地男友有异常，数分闺蜜来帮忙  
select * from cmb_usr_trx_rcd where '2024-09-01' and '2024-09-30' and usr_id='5201314520'