访问查询 - 如果字段为空不输出？

Posted 2023-05-07

【中文标题】访问查询 - 如果字段为空不输出？

【英文标题】：Aceess Query - If field is null dont output?

【发布时间】：2012-12-28 01:59:59

【问题描述】：

我有一个访问查询 (2003)：

SELECT [User] [100], [101], [102], [103], [104], [105], [106], [107], [108], [109], [110]
FROM [Access_Count>1] 

我得到的结果是这样的：

[User], [100], [101], [102], [103], [104], [105], [106], [107], [108], [109], [110]
UserA,100,101,,,,,,,,,
UserB,,,,,,,,109,110

有什么方法可以从输出中排除空白列/字段？所以我的结果是这样的：

[User], [100], [101], [109], [110]
UserA,100,101,,
UserB,,,109,110

我今天通过 google 进行了一次大规模搜索，在其他地方发现了一个类似的问题，但从未解决。

样本数据：http://db.tt/rM2JUvNR

干杯，

迈克尔

【问题讨论】：

谢谢伙计，也很想知道是否有人能得到我想要的东西。已经将您的代码放入模块中：) 是的，但我觉得我再次使用 Access 碰了壁。

一般情况下，SQL 要求输出格式具有预先确定的列。在其他数据库中，您可能会为此目的使用动态 SQL。但是，没有“纯”SQL 解决方案来改变列数。

您能否显示来自表[Access_Count>1] 的一些示例数据，我想知道是否可以根据您的需要形成一个Crosstab 查询？

这里是一些示例数据，也已添加到 OP。 db.tt/rM2JUvNR

@MichaelCarn-Bennett 我想我对示例数据后的答案感到更加困惑^_^，但很高兴你已经解决了。

【参考方案1】：

输出必须是表格吗？值可以拼接成字符串吗？

如果是这样，您可以执行以下操作：

select t.[user],
       mid((iif(Keep100 = 'Y', ','&[100])&
            iif(Keep101 = 'Y', ','&[101])&
            . . .
           ), 2)
from [AccessCount>1],
     (select t, iif(max([100]) is null, 'N', 'Y') as Keep100,
             iif(max([101]) is null, 'N', 'Y') as Keep101,
             . . .
      from [AccessCount>1]
     ) tkeep

这个想法是用逗号作为分隔符构建一个字符串。 mid 语句只是删除字符串中的第一个字符。

【讨论】：

不，输出不一定是表格，对于最终结果，我只需要将数据输入 Excel。我对您发布的内容没有太多经验，但我现在试一试。将报告回来。

到目前为止工作愉快！！非常感谢。完成后，我将发布我完成的代码/查询，以便它与 OP 中发布的示例数据一起使用。

【参考方案2】：

我必须分成 2 个查询，当我尝试执行所有 200 个查询时，它会将 Access 列作为#error 抛出。

非常感谢 Gordon Linoff，我希望这对未来的人有所帮助 :)

select Access_Count_1.[Name],Access_Count_1.[Manager],
mid((iif(Keep100 = 'Y', ','&[100])&
iif(Keep101 = 'Y', ','&[101])&
iif(Keep102 = 'Y', ','&[102])&
iif(Keep103 = 'Y', ','&[103])&
iif(Keep104 = 'Y', ','&[104])&
iif(Keep105 = 'Y', ','&[105])&
iif(Keep106 = 'Y', ','&[106])&
iif(Keep107 = 'Y', ','&[107])&
iif(Keep108 = 'Y', ','&[108])&
iif(Keep109 = 'Y', ','&[109])&
iif(Keep110 = 'Y', ','&[110])&
iif(Keep111 = 'Y', ','&[111])&
iif(Keep112 = 'Y', ','&[112])&
iif(Keep113 = 'Y', ','&[113])&
iif(Keep114 = 'Y', ','&[114])&
iif(Keep115 = 'Y', ','&[115])&
iif(Keep116 = 'Y', ','&[116])&
iif(Keep117 = 'Y', ','&[117])&
iif(Keep118 = 'Y', ','&[118])&
iif(Keep119 = 'Y', ','&[119])&
iif(Keep120 = 'Y', ','&[120])&
iif(Keep121 = 'Y', ','&[121])&
iif(Keep122 = 'Y', ','&[122])&
iif(Keep123 = 'Y', ','&[123])&
iif(Keep124 = 'Y', ','&[124])&
iif(Keep125 = 'Y', ','&[125])&
iif(Keep126 = 'Y', ','&[126])&
iif(Keep127 = 'Y', ','&[127])&
iif(Keep128 = 'Y', ','&[128])&
iif(Keep129 = 'Y', ','&[129])&
iif(Keep130 = 'Y', ','&[130])&
iif(Keep131 = 'Y', ','&[131])&
iif(Keep132 = 'Y', ','&[132])&
iif(Keep133 = 'Y', ','&[133])&
iif(Keep134 = 'Y', ','&[134])&
iif(Keep135 = 'Y', ','&[135])&
iif(Keep136 = 'Y', ','&[136])&
iif(Keep137 = 'Y', ','&[137])&
iif(Keep138 = 'Y', ','&[138])&
iif(Keep139 = 'Y', ','&[139])&
iif(Keep140 = 'Y', ','&[140])&
iif(Keep141 = 'Y', ','&[141])&
iif(Keep142 = 'Y', ','&[142])&
iif(Keep143 = 'Y', ','&[143])&
iif(Keep144 = 'Y', ','&[144])&
iif(Keep145 = 'Y', ','&[145])&
iif(Keep146 = 'Y', ','&[146])&
iif(Keep147 = 'Y', ','&[147])&
iif(Keep148 = 'Y', ','&[148])&
iif(Keep149 = 'Y', ','&[149])&
iif(Keep150 = 'Y', ','&[150])
), 2) As Access
from [Access_Count_1],
(select 
iif(max([100]) is null, 'N', 'Y') as Keep100,
iif(max([101]) is null, 'N', 'Y') as Keep101,
iif(max([102]) is null, 'N', 'Y') as Keep102,
iif(max([103]) is null, 'N', 'Y') as Keep103,
iif(max([104]) is null, 'N', 'Y') as Keep104,
iif(max([105]) is null, 'N', 'Y') as Keep105,
iif(max([106]) is null, 'N', 'Y') as Keep106,
iif(max([107]) is null, 'N', 'Y') as Keep107,
iif(max([108]) is null, 'N', 'Y') as Keep108,
iif(max([109]) is null, 'N', 'Y') as Keep109,
iif(max([110]) is null, 'N', 'Y') as Keep110,
iif(max([111]) is null, 'N', 'Y') as Keep111,
iif(max([112]) is null, 'N', 'Y') as Keep112,
iif(max([113]) is null, 'N', 'Y') as Keep113,
iif(max([114]) is null, 'N', 'Y') as Keep114,
iif(max([115]) is null, 'N', 'Y') as Keep115,
iif(max([116]) is null, 'N', 'Y') as Keep116,
iif(max([117]) is null, 'N', 'Y') as Keep117,
iif(max([118]) is null, 'N', 'Y') as Keep118,
iif(max([119]) is null, 'N', 'Y') as Keep119,
iif(max([120]) is null, 'N', 'Y') as Keep120,
iif(max([121]) is null, 'N', 'Y') as Keep121,
iif(max([122]) is null, 'N', 'Y') as Keep122,
iif(max([123]) is null, 'N', 'Y') as Keep123,
iif(max([124]) is null, 'N', 'Y') as Keep124,
iif(max([125]) is null, 'N', 'Y') as Keep125,
iif(max([126]) is null, 'N', 'Y') as Keep126,
iif(max([127]) is null, 'N', 'Y') as Keep127,
iif(max([128]) is null, 'N', 'Y') as Keep128,
iif(max([129]) is null, 'N', 'Y') as Keep129,
iif(max([130]) is null, 'N', 'Y') as Keep130,
iif(max([131]) is null, 'N', 'Y') as Keep131,
iif(max([132]) is null, 'N', 'Y') as Keep132,
iif(max([133]) is null, 'N', 'Y') as Keep133,
iif(max([134]) is null, 'N', 'Y') as Keep134,
iif(max([135]) is null, 'N', 'Y') as Keep135,
iif(max([136]) is null, 'N', 'Y') as Keep136,
iif(max([137]) is null, 'N', 'Y') as Keep137,
iif(max([138]) is null, 'N', 'Y') as Keep138,
iif(max([139]) is null, 'N', 'Y') as Keep139,
iif(max([140]) is null, 'N', 'Y') as Keep140,
iif(max([141]) is null, 'N', 'Y') as Keep141,
iif(max([142]) is null, 'N', 'Y') as Keep142,
iif(max([143]) is null, 'N', 'Y') as Keep143,
iif(max([144]) is null, 'N', 'Y') as Keep144,
iif(max([145]) is null, 'N', 'Y') as Keep145,
iif(max([146]) is null, 'N', 'Y') as Keep146,
iif(max([147]) is null, 'N', 'Y') as Keep147,
iif(max([148]) is null, 'N', 'Y') as Keep148,
iif(max([149]) is null, 'N', 'Y') as Keep149,
iif(max([150]) is null, 'N', 'Y') as Keep150     
from [Access_Count_1]
) tkeep