GMB
2020-12-02 05:08:01
你似乎想要每个实验室的最新消息。一种选择是使用横向连接。假设该表messages具有一个名为的外键列，该列labid引用labs，并且该列id可用于对行进行排序，则可以将其表述为：
select l.*, m.mesage
from labs l
cross apply (
select top (1) * from messages m where m.labid = l.labid order by m.id desc
) m
如果要允许没有消息的实验室，请outer apply改用。
另一种选择是row_number()：
select l.*, m.mesage
from labs l
inner join (
select m.*, row_number() over(partition by labid order by id desc) rn
from messages m
) m on m.labid = l.labid and m.rn = 1
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Mamba is a new state space model architecture showing promising performance on information-dense data such as language modeling, where previous subquadratic models fall short of Transformers. It is based on the line of progress on structured state space models, with an efficient hardware-aware design and implementation in the spirit of FlashAttention.
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