Question

我有一张像

这样的表格

CREATE TABLE FinishedMappings ( 
    partner_id UNIQUEIDENTIFIER, 
    survey_id INT,
    PRIMARY KEY (partner_id,survey_id),
    FOREIGN KEY (partner_id) REFERENCES Partners(id),
    FOREIGN KEY (survey_id) REFERENCES Surveys(id)
);

这是跟踪调查的人。如果X人未进行调查Y，那么partner_id=X,survey_id=Y组合就不在该表中。我创建了一个存储过程，该存储过程根据一个人是否进行了特定调查的新信息进行更新。我是如何开始写作的

CREATE PROCEDURE UpdateFinishValue (@partner_id UNIQUEIDENTIFIER, 
                                    @survey_id INT,
                                    @finished TINYINT)
AS  
    IF [finished is equal to 1 and the @partner_id,@survey_id pair isnt in the FinishedMappings db]
        INSERT INTO FinishedMappings (partner_id,survey_id) VALUES (survey_id,partner_id)
    ELSE
        DELETE FROM FinishedMappings WHERE partner_id=@partner_id AND survey_id=@survey_id
GO

但我不确定如何实施

[finished is equal to 1 and the @partner_id,@survey_id pair isnt in the FinishedMappings db]

部分或者如果有更紧凑的整体写作方式。有什么帮助吗？

Answer 1

这样的事情：

if (@finished = 1 and
    not exists (select 1
                from FinishedMappings fm
                where fm.partner_id = @parner_id and fm.survey_id = @survey_id
               )
   )
begin
    . . .
end;

如何在我的T-SQL事务中实现这个If-Else逻辑？

1 个答案: