编程趣事：SQL Error 191

Alex Papadimoulis曾发表过一篇博文《SQL Error 191: Nested Way Too F#%&ing Deeply》，文中表示他软件界中有很多有趣的事，就拿HTTP 414 错误：请求的URI太长来说，Alex Papadimoulis就发现了一个嵌套达500层的令人唏嘘的SQL语句，你想见识一下这个SQL语句吧。感谢外刊IT评论翻译了本文，现转载于此，供大家分享。全文如下：

软件开发里有很多有趣的事情，你通常只接触某种特定类型的应用，见识太少。比如，这HTTP 414 错误:请求的URI太长。对于这个长度没有一个标准的上限，很多web服务器都没有说明多长的GET请求会太长。

当我在维护这家公司的服务处的应用时，Ben在SQL Server里发现了一个相似类型的错误。

Incorrect syntax near '('.
//你的一部分SQL语句嵌套的太深。
Some part of your SQL statement is nested too deeply.
//请重写你的查询语句，或把它们分成小语句。
Rewrite the query or break it up into smaller queries.

错误代码是Error 191——又是一个没有标准上限的错误——由下面的查询语句触发。

SELECT DISTINCT COUNT(Task.RecId)
  FROM Task
 WHERE (Task.TaskType = @P514)
   AND (Task.Status = @P1)
   AND (Task.RecId is not null)
   AND ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       ((((((((((((((((((((((((((((((((((((((((((((((((((((
       (((((((((((((((((((((((((((((((((((((((((((
            (Task.OwnerTeam = @P2)
            AND (Task.OwnerTeam = @P3))
            AND (Task.OwnerTeam = @P4))
            AND (Task.OwnerTeam = @P5))
            AND (Task.OwnerTeam = @P6))
            AND (Task.OwnerTeam = @P7))
            AND (Task.OwnerTeam = @P8))
            AND (Task.OwnerTeam = @P9))
            AND (Task.OwnerTeam = @P10))
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            AND (Task.OwnerTeam = @P40))
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            AND (Task.OwnerTeam = @P161))
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            AND (Task.OwnerTeam = @P171))
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            AND (Task.OwnerTeam = @P189))
            AND (Task.OwnerTeam = @P190))
            AND (Task.OwnerTeam = @P191))
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            AND (Task.OwnerTeam = @P512))
            AND (Task.OwnerTeam = @P513)))

我不得不承认，这个嵌套真是太深了。

原文链接：SQL Error 191: Nested Way Too F#%&ing Deeply

译文链接：http://www.aqee.net/2010/09/16/sql-error-191-nested-way-too-fing-deeply/