带参数存储过程的条件查询

Question

我正在学习 SQL 所以我还不知道这门语言的所有精妙之处，

我写了如下存储过程（这里简化）：

ALTER PROCEDURE [dbo].[SelectAllIssues]
    @Status nvarchar(1) = 0
AS
BEGIN
    SET NOCOUNT ON;

    IF @Status = 1 OR @Status = 2
    BEGIN
        SELECT IssueStatuses.Id AS 'StatusId'
        FROM Issues 
        INNER JOIN IssueStatuses ON Issues.IssueStatusId = IssueStatuses.Id
        WHERE Issues.IssueStatusId = @Status
        ORDER BY Created
    END
    ELSE
    BEGIN
        SELECT IssueStatuses.Id AS 'StatusId'
        FROM Issues 
        INNER JOIN IssueStatuses ON Issues.IssueStatusId = IssueStatuses.Id
        ORDER BY Created
    END 
END

但这看起来不像是一种自然的方式，而且有很多重复的代码。

我想避免类似

的事情

EXEC sp_executesql @sqlStrComplet

但如果这是唯一的方法。

我不知道正确的标签，但是 sqllocaldb info MSSQLLocalDB return

版本：13.1.4001.0

我使用 SQL Server Management Studio (SSMS)

Answer 1

刚刚：

select s.Id as StatusId
from issues i
inner join IssueStatuses s on i.IssueStatusId = s.Id
where (i.IssueStatusId = @Status and @status in (1, 2)) or @status not in (1, 2)
Order By created

where子句可以简化为：

where i.IssueStatusId = @Status or @status not in (1, 2)

带参数存储过程的条件查询

Conditional query with a parameter stored procedure

sql

sql-server

stored-procedures

where-clause