SQL 使用随机查找值更新行列

Question

我正在尝试更新潜在客户 table 以从查找 table 中随机分配一个人。这是通用架构：

TableA (header),
ID int,
name varchar (30)

TableB (detail),
ID int,
fkTableA int, (foreign key to TableA.ID)
recordOwner varchar(30) null
other detail colums..

TableC (owners),
ID int,
fkTableA int (foreign key to TableA.ID)
name varchar(30)

TableA 有 10 个条目，每种类型的销售线索池一个。 TableB TableA 中的每一行都有数千个条目。我想将正确的 recordOwners 从 TableC 分配给偶数行（或尽可能接近）。 TableC 将从 tableA 中每一行的一个条目到最多 10 个条目。

这可以在一个语句中完成吗？它不一定是。我似乎无法找出提高速度的最佳方法。任何想法或样本都将受到赞赏。

已更新：
TableA 与 TableC 具有一对多关系。对于 TableA、TableC 的每条记录将至少有一行，代表需要分配给 TableB 中的一行的所有者。

TableA
int  name
1    LeadSourceOne
2    LeadSourceTwo

TableC
int(id) int(fkTableA) varchar(name)
1       1             Tom
2       1             Bob
3       2             Timmy
4       2             John
5       2             Steve
6       2             Bill

TableB initial data
int(id) int(fkTableA) varchar(recordOwner) (other detail columns)
1       1             NULL                 ....
2       1             NULL                 ....
3       1             NULL                 ....
4       2             NULL                 ....
5       2             NULL                 ....
6       2             NULL                 ....
7       2             NULL                 ....
8       2             NULL                 ....
9       2             NULL                 ....

TableB end result
int(id) int(fkTableA) varchar(recordOwner) (other detail columns)
1       1             TOM                  ....
2       1             BOB                  ....
3       1             TOM                  ....
4       2             TIMMY                ....
5       2             JOHN                 ....
6       2             STEVE                ....
7       2             BILL                 ....
8       2             TIMMY                ....
9       2             BILL                 ....

基本上我需要根据与tableA的关系随机分配一条记录从tableC到tableB。

Answer 1

UPDATE TabB SET name = (SELECT TOP 1 coalesce(tabC.name,'') FROM TabC  INNER JOIN TabA ON TabC.idA  = TabA.id  WHERE tabA.Id = TabB.idA )

应该可以，但未经过测试。

Answer 2

试试这个：

UPDATE TableB
SET recordOwner = (SELECT TOP(1) [name] 
                   FROM TableC
                   ORDER BY NEWID())
WHERE recordOwner IS NULL

Answer 3

我最终循环遍历并根据我拥有的所有者数量更新了 x% 的详细记录。最终结果是这样的：

create table #tb_owners(userId varchar(30), processed bit)

    insert into #tb_owners(
        userId, 
        processed)
    select userId = name, 
        processed = 0
    from tableC 
    where fkTableA = 1

    select @percentUpdate = cast(100 / count(*) as numeric(8,2))
    from #tb_owners

    while exists(select 1 from #tb_owners o where o.processed = 0)
        begin
            select top 1 
                @userFullName = o.name
            from #tb_owners o
            where o.processed = 0
            order by newId()


            update tableB
            set recordOwner = @userFullName
            from tableB ptbpd
                inner join (
                            select top (@percentUpdate) percent 
                                id
                            from tableB
                            where recordOwner is null
                            order by newId()
                    ) nd on (ptbpd.id = nd.id)


            update #tb_owners
            set processed = 1
            where userId = @oUserId
        end

    --there may be some left over, set to last person used
    update tableB
    set recordOwner = @userFullName
    from tableB
    where ptbpd.recordOwner is null

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