Question

我有一个SQL查询，但我想显示几个月，没有条目。现在只需输入条目即可。这是代码：

    SELECT YEAR(T0.[Recontact]) AS 'Év', MONTH(T0.[Recontact]) AS 'Hónap',
           T1.[SlpName], COUNT(T0.[ClgCode]) AS 'Tárgyalások'
    FROM OCLG T0
    INNER JOIN OSLP T1 ON T0.[SlpCode] = T1.[SlpCode]
    WHERE T0.[Action] = 'M' AND
    T0.[Recontact] >= 'date' AND
    T0.[Recontact] <= 'date2' AND
    T1.[SlpName] = 'user name'
   GROUP BY YEAR(T0.[Recontact]), MONTH(T0.[Recontact]), T1.[SlpName]
   ORDER BY 1,2

Answer 1

如果您的数据中完全没有年份+月份，则您需要在可以在该位置显示的某处构建一个空行。您可以创建日历表（每天一行）或月表（每月一行）。那也可以是＆＃34;虚拟＆＃34;计算表以CTE或类似方式构建。

一旦你有了这个，你可以这样做：

select 
  M.Year, M.Month, X.SlpName, isnull(X.CODES,0) as CODES
from 
  months M
  outer apply (
    SELECT 
      YEAR(T0.[Recontact]) as Year, 
      MONTH(T0.[Recontact]) AS Month,
      T1.[SlpName], 
      COUNT(T0.[ClgCode]) AS CODES
    FROM OCLG T0
    INNER JOIN OSLP T1 ON T0.[SlpCode] = T1.[SlpCode]
    WHERE T0.[Action] = 'M' AND
    T0.[Recontact] >= 'date' AND
    T0.[Recontact] <= 'date2' AND
    T1.[SlpName] = 'user name'
   GROUP BY YEAR(T0.[Recontact]), MONTH(T0.[Recontact]), T1.[SlpName]
) X on X.Year = M.Year and X.Month = M.Month
where M.MONTHDATE >= 'date' and M.MONTHDATE <= 'date2'
ORDER BY 1,2

这是一个假想的月份表，其中包含年，月和月日期列，日期是该月的第一天 - 您仍然需要检查您提取的范围是否正确

我还没有对此进行测试，但它应该有效。

Answer 2

在请求中用LEFT JOIN替换INNER JOIN以获得NULL结果。

SELECT YEAR(T0.[Recontact]) AS 'Év', MONTH(T0.[Recontact]) AS 'Hónap',
       T1.[SlpName], COUNT(T0.[ClgCode]) AS 'Tárgyalások'
FROM OCLG T0
LEFT JOIN OSLP T1 ON (T0.[SlpCode] = T1.[SlpCode]
                      AND T1.[SlpName] = 'user name')
WHERE T0.[Action] = 'M'
  AND T0.[Recontact] >= 'date'
  AND T0.[Recontact] <= 'date2'
GROUP BY YEAR(T0.[Recontact]), MONTH(T0.[Recontact]), T1.[SlpName]
ORDER BY 1,2

Answer 3

在请求中用LEFT JOIN替换INNER JOIN以获得NULL结果。了解更多访问： http://academy.comingweek.com/sql-groupby-clause/

按年份分组sql，当没有条目写入0时

3 个答案: