如何使值为0的where子句不检查SQL Server存储过程中的where？

我有一个存储过程：

CREATE PROCEDURE ListIds
    @ObjectiveId int,
    @SubjectId int,
AS
BEGIN

    SELECT Question.QuestionUId
    FROM Objective
    WHERE Objective.objectiveId = @ObjectiveId 
    AND   Objective.subjectId = @SubjectId

END;

如何使存储过程@ObjectiveId为0时，不会基于表中的ObjectiveId选择。但是，我希望始终选择主题Id。

请尝试以下操作：

CREATE PROCEDURE ListIds
    @ObjectiveId int,
    @SubjectId int,
AS
BEGIN

    SELECT Question.QuestionUId
    FROM Objective
    WHERE (ObjectiveId = 0 OR Objective.objectiveId = @ObjectiveId)
       AND Objective.subjectId = @SubjectId

END;

CREATE PROCEDURE ListIds
    @ObjectiveId  INT,
    @SubjectId    INT 
AS
BEGIN

    SELECT  QuestionUId
    FROM    Objective
    WHERE   Objective.subjectId = @SubjectId AND 
            (ISNULL(@ObjectiveId,0) = 0 OR Objective.objectiveId = @ObjectiveId) 

END;

---

如果为0，则应选择什么？仅根据SubjectId-1进行选择这是不正确的，因为他希望始终通过

SubjectId

进行筛选：“我希望始终根据主题Id进行选择”。仅当

ObjectiveId 0

时，您才进行筛选，这也是不正确的，因为他只想在参数为0时跳过

ObjectiveId

筛选。当

ObjectiveId

为

null

时，这将不起作用。然后处理该值为null（c），=”的情况

SELECT Question.QuestionUId
FROM Objective
WHERE (Objective.objectiveId = @ObjectiveId OR @ObjectiveId = 0)  
      AND Objective.subjectId = @SubjectId

CREATE PROCEDURE ListIds
    @ObjectiveId  INT,
    @SubjectId    INT 
AS
BEGIN

    SELECT  QuestionUId
    FROM    Objective
    WHERE   Objective.subjectId = @SubjectId AND 
            (ISNULL(@ObjectiveId,0) = 0 OR Objective.objectiveId = @ObjectiveId) 

END;