查询行之间的关系

Question

我需要在单身 table 中找到多人之间的关系，例如我有以下 table:

Guests Table

所以我需要通过 sql 脚本说客人 123 和 456 他们在同一时间一起入住同一家酒店 80% 等等...

多多支持

Answer 1

它有点复杂，所以我使用带有匹配键的 CTE 将它分解为多个子查询。

这将生成一系列匹配对 - 对于主要客人和次要客人，他们在一起的频率比只是登记入住。

设置：

create table temp(
    hotelID integer,
    checkInDate date,
    guestID integer
)

insert into temp values (101, '2020/06/01', 123)
insert into temp values (101, '2020/06/01', 456)
insert into temp values (102, '2020/06/15', 123)
insert into temp values (102, '2020/06/15', 456)
insert into temp values (103, '2020/06/30', 123)
insert into temp values (103, '2020/06/30', 456)
insert into temp values (104, '2020/07/15', 123)
insert into temp values (104, '2020/07/15', 789)
insert into temp values (105, '2020/07/01', 456)
insert into temp values (105, '2020/07/01', 789)

查询：

    with keyCte as (
        select 
            distinct cast(hotelID as varchar(3)) + cast(checkInDate as varchar(10)) as myKey,
            guestID
        from temp
    ) 

    select 
          guestPrime
        , guestTwo
        , instances as guestPrimeStays
        , matches as guestTwoMatches
        , cast(matches as float) / cast(instances as float) as hitRate

    from (
            select 
                  guestID
                , count(*) as instances 
            from keyCte 
            group by guestID
         ) sq3

    join (
        select
            guestPrime
            , guestTwo
            , count(*) as matches
        from (
            select 
                keyCte.guestID as guestPrime
              , kcte.guestID as guestTwo
            from keyCte
            join keyCte kcte on kcte.myKey = keyCte.myKey and kcte.guestID != keyCte.guestID
        ) sq 
        group by guestPrime, guestTwo

    ) sq2 on sq2.guestPrime = guestID

查询行之间的关系

Query for relationships between rows

sql-server

database

rdbms