SQL 在存储过程中根据 Id 连接表

Question

我需要使用 JOIN 存储过程提取索赔人 ID 的所有保单列。

伪代码：select * 来自 policies(tbl) 其中 parties.id = policy.policyNumber.

这是我目前所拥有的...

CREATE PROCEDURE [dbo].[usp_GetPolicyForClaimentByPolicyIdNumber]
(
    @IdNumber varchar(255) = null
)
AS
BEGIN
SELECT *
    FROM [BinderCurrent].[Policy]
    LEFT JOIN [BinderCurrent].[Policy] ON ([BinderCurrent].[Parties].Id = [BinderCurrent].[PolicyRoles].PolicyId)
    WHERE   [BinderCurrent].[PolicyRoles].PolicyRoleTypeId = 40
    AND (@IdNumber IS NULL OR [BinderCurrent].[Parties].IdNumber LIKE ''+@IdNumber+'%') 
    ORDER BY Id DESC

END

Answer 1

使用 ON 子句过滤：

SELECT *
FROM [BinderCurrent].[Policy] LEFT JOIN 
     [BinderCurrent].[Policy] 
     ON ([BinderCurrent].[Parties].Id = [BinderCurrent].[PolicyRoles].PolicyId AND
         [BinderCurrent].[PolicyRoles].PolicyRoleTypeId = 40
WHERE (@IdNumber IS NULL OR [BinderCurrent].[Parties].IdNumber LIKE ''+@IdNumber+'%')
ORDER BY Id DESC;

注意：Table [BinderCurrent].[PolicyRoles] 也应与 JOIN 一起出现。这假定这是您查询的一部分。

SQL 在存储过程中根据 Id 连接表

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