sql - SQL Server 2005 Query between two tables

Question

I've got two tables (see below), RM and RP. In the RP Table below, the Provider key can have many RegionIds (key) associated with it. Can I create a query that will allow me to return a Provider with all of their associated RegionIds (using the RP table) and also grab the RegionIds respective ClientNum from the RM Table?

RM Table                      RP Table
--------                      --------
RegionId   key                RegionId   key
..                            Provider   key
..
ClientNum

Answer 1

尝试这个：

SELECT P.*, RM.RegionId, RM.ClientNum
FROM Provider P
INNER JOIN RP ON P.ID = RP.Provider
INNER JOIN RM ON RM.RegionId = RP.RegionId

您将获得每个 provider/clientNum 关联的一行

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