小编Eri*_*c S的帖子

我今天遇到了一个查询，它做了一些我以前从未见过的事情。它做了这样的事情：

SELECT 
    MIN(+ - schema_id) AS [WhatInTheWorld?], 
    MIN(schema_id) AS MinimumID, 
    MAX(+ - schema_id) AS [Uhhh], 
    MAX(schema_id) AS MaxID
FROM sys.objects

这给出了以下结果：

WhatInTheWorld? MinimumID    Uhhh       MaxID
-4              1            -1         4

“+”和“-”究竟是做什么的？

当我执行从多个链接服务器提取信息并聚合数据的存储过程时，偶尔会收到此错误消息。它看起来与我下面的相似。

DECLARE Cur CURSOR FOR SELECT name FROM sys.servers WHERE is_linked = 1 AND (@Environments IS NULL OR name IN (SELECT Item FROM clrStringSplit(@Environments, ',')))
OPEN cur
FETCH NEXT FROM cur INTO @Environment
WHILE @@FETCH_STATUS = 0
BEGIN
BEGIN TRY   

    SET @Query = '          
        EXEC ' + @Environment + '.db.dashboard.storedproc ''' + CAST(@StartDate AS VARCHAR(10)) + ''', ''' + CAST(@EndDate AS VARCHAR(10)) + ''''

    INSERT INTO #Table (Environment, Column1, Column2, Column3, Column4, Column5, Column6, Column7)
    EXEC(@Query)
END TRY
BEGIN CATCH …