我正在使用动态存储过程
if @ReportType = 'Daily Batch'
begin
set @SelectionList= 'select ''' + @tag0 + ''' as Tag0 , ''' + @tag1 + ''' as Tag1 , ''' + @tag2 + ''' as Tag2 , ''' + @tag3 + ''' as Tag3 , ''' + @tag4 + ''' as Tag4 , ''' + @tag5 + ''' as Tag5
, ''' + @tag6 + ''' as Tag6 , ''' + @tag7 + ''' as Tag7 , ''' + @tag8 + ''' as Tag8 , ''' + @tag9 + ''' as Tag9 , ''' + @tag10 + ''' as Tag10 , ''' + @tag11 + ''' as Tag11
, ' + @value0 + ' as Value0 , ' + @value1 + ' as Value1, ' + @value2 + ' as Value2 , ' + @value3 + ' as Value3 , ' + @value4 + ' as Value4 , ' + @value5 + ' as Value5
, ' + @value6 + ' as Value6 , ' + @value7 + ' as Value7 , ' + @value8 + ' as Value8 , ' + @value9 + ' as Value9 , ' + @value10 + ' as Value10 , ' + @value11 + ' as Value11
, RefProductWgt1, RefProductWgt2, RefProductWgt3, RefProductWgt4, RefProductWgt5, RefProductWgt6, RefProductWgt7, RefProductWgt8,
RefProductWgt9, RefProductWgt10, ProductCount, PassCount, RejectCount, UnderWgts, OverWgts, DoubleCount, ReportId, StartDate as GroupColumn
FROM BatchMaster
WHERE SUBSTRING(StartDate, 0, charindex('/' , StartDate, 0))='''+ @startdate+''') AND (DeviceId = '''+@devid+''')
end
exec (@SelectionList)
此@SelectionList
数据类型为nvarchar(3000)
,我只想从DateTime
列中提取数据...
但是它显示了这个错误:
操作数数据类型varchar对除运算符无效。
此处'/'
用作字符不分,因为在我的专栏DateStoreLike
(dd-mm-yy/HH:MM:SS
)中,我试图仅提取'/'
符号之前的日期部分< / p>
答案 0 :(得分:1)
您收到的错误是因为您需要在斜线的每一边都有两个单引号:
...WHERE SUBSTRING(StartDate, 0, charindex(''/'' , StartDate, 0))='''+ @startdate+''') AND (DeviceId = '''+@devid+''')
例如,以下两个查询将返回“5”作为结果:
SELECT charindex('/' , 'this/string', 0)
DECLARE @sql VARCHAR (55) = 'SELECT charindex(''/'' , ''this/string'', 0)'
EXEC(@sql)
如果要在字符串中显示单引号,则需要使用两个单引号。为了演示这一点,您可以运行以下命令:
SELECT '' --This will return an empty string
SELECT '''' --This will return a single quotation mark