SQL統計1-12月的數據，沒有數據的月份顯示爲0

1.利用臨時表補足數據（HANA）

select A.DATAYEAR as DATAYEAR, A.DATAMONTH as DATAMONTH,sum(DATANUM) as DATANUM from (select YEAR(GL_LZ_XKTZ_NY) as DATAYEAR,Month(GL_LZ_XKTZ_NY) as DATAMONTH,count(*) as DATANUM from TableName where Year(GL_LZ_XKTZ_NY) >= year(ADD_YEARS(current_date,-1)) and  Year(GL_LZ_XKTZ_NY) <= year(current_date) group by YEAR(GL_LZ_XKTZ_NY) , Month(GL_LZ_XKTZ_NY) union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 1  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 2  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 3  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 4  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 5  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 6  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 7  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 8  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 9  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 10  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 11  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(ADD_YEARS(current_date,-1)) as DATAYEAR, 12  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 1  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 2  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 3  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 4  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 5  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 6  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 7  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 8  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 9  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 10  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 11  as DATAMONTH , 0  as DATANUM from DUMMY
union 
select year(current_date) as DATAYEAR, 12  as DATAMONTH , 0  as DATANUM from DUMMY )A group by A.DATAYEAR,A.DATAMONTH order by A.DATAYEAR,A.DATAMONTH

 

注：DUMMY 是虛表、臨時表

2.新建一張表，表中只有一個字段，只有12行數據，即（1,2,3,4,5...12）,而後左連接須要統計的數據表。
3.利用Case When Else End 枚舉：(月份顯示在表名上)(SQL)

select 'Title' as 'dataTitle', isnull(sum(case when month = '1' then ThisMonthPassNum else 0 end),0) as 'month1' , isnull(sum(case when month = '2' then ThisMonthPassNum else 0 end),0) as 'month2' , isnull(sum(case when month = '3' then ThisMonthPassNum else 0 end),0) as 'month3' , isnull(sum(case when month = '4' then ThisMonthPassNum else 0 end),0) as 'month4' , isnull(sum(case when month = '5' then ThisMonthPassNum else 0 end),0) as 'month5' , isnull(sum(case when month = '6' then ThisMonthPassNum else 0 end),0) as 'month6' , isnull(sum(case when month = '7' then ThisMonthPassNum else 0 end),0) as 'month7' , isnull(sum(case when month = '8' then ThisMonthPassNum else 0 end),0) as 'month8' , isnull(sum(case when month = '9' then ThisMonthPassNum else 0 end),0) as 'month9' , isnull(sum(case when month = '10' then ThisMonthPassNum else 0 end),0) as 'month10' , isnull(sum(case when month = '11' then ThisMonthPassNum else 0 end),0) as 'month11' , isnull(sum(case when month = '12' then ThisMonthPassNum else 0 end),0) as 'month12' 
from TableName