我有一个大的firebird sql查询，正在产生"太多的关系/过程/视图上下文"。最大允许为255" - error
我已经看过了，但不知道如何减少它，所以不再产生上述错误。
查询返回一年中每周的计数，如果没有，则返回0的一周。它应该包含一年中所有52/53周的正确计数或0。
当我只使用少于255个关系/过程/视图时，查询工作得很好，但我需要找到一种方法来减少查询，以便它为所有52/53周提供相同的结果。
Select "Week"||''||"Year" as "Week", "Courses"
From (
select ' 02 Jan ' as "Week", (select count(Distinct crs.ID)from comp_Invoice IV
inner join Course CRS on IV.COD_COURSE=CRS.id
where extract(week from BOOKING_DATE) = 1
and BOOKING_DATE between :StartDate and :EndDate
and crs.c_type = 'OS'
and crs.name not like '%Cancel%'
and crs.name not like 'CERT'
and crs.name not like '%cancel%'
and crs.name not like '%CANCELl%'
and crs.name not like '%CANCELL%'
and crs.version not like 'CONSTRUC%'
and crs.version Like :CoursesTitle ) as "Courses",
extract(year from IV.BOOKING_DATE) as "Year",
01 as "Sorter"
from comp_Invoice IV
inner join Course CRS on IV.COD_COURSE=CRS.id
where
BOOKING_DATE between :StartDate and :EndDate
and crs.c_type = 'OS'
and crs.name not like '%Cancel%'
and crs.name not like 'CERT'
and crs.name not like '%cancel%'
and crs.name not like '%CANCELl%'
and crs.name not like '%CANCELL%'
and crs.version not like 'CONSTRUC%'
and crs.version Like :CoursesTitle
group by 3
UNION
select ' 09 Jan ' as "Week", (select count(Distinct crs.ID)from comp_Invoice IV
inner join Course CRS on IV.COD_COURSE=CRS.id
where extract(week from BOOKING_DATE) = 2
and BOOKING_DATE between :StartDate and :EndDate
and crs.c_type = 'OS'
and crs.name not like '%Cancel%'
and crs.name not like 'CERT'
and crs.name not like '%cancel%'
and crs.name not like '%CANCELl%'
and crs.name not like '%CANCELL%'
and crs.version not like 'CONSTRUC%'
and crs.version Like :CoursesTitle ) as "Courses",
extract(year from IV.BOOKING_DATE) as "Year",
02 as "Sorter"
from comp_Invoice IV
inner join Course CRS on IV.COD_COURSE=CRS.id
where
BOOKING_DATE between :StartDate and :EndDate
and crs.c_type = 'OS'
and crs.name not like '%Cancel%'
and crs.name not like 'CERT'
and crs.name not like '%cancel%'
and crs.name not like '%CANCELl%'
and crs.name not like '%CANCELL%'
and crs.version not like 'CONSTRUC%'
and crs.version Like :CoursesTitle
group by 3
UNION
select ' 16 Jan ' as "Week", (select count(Distinct crs.ID)from comp_Invoice IV
inner join Course CRS on IV.COD_COURSE=CRS.id
where extract(week from BOOKING_DATE) = 3
and BOOKING_DATE between :StartDate and :EndDate
and crs.c_type = 'OS'
and crs.name not like '%Cancel%'
and crs.name not like 'CERT'
and crs.name not like '%cancel%'
and crs.name not like '%CANCELl%'
and crs.name not like '%CANCELL%'
and crs.version not like 'CONSTRUC%'
and crs.version Like :CoursesTitle ) as "Courses",
extract(year from IV.BOOKING_DATE) as "Year",
03 as "Sorter"
from comp_Invoice IV
inner join Course CRS on IV.COD_COURSE=CRS.id
where
BOOKING_DATE between :StartDate and :EndDate
and crs.c_type = 'OS'
and crs.name not like '%Cancel%'
and crs.name not like 'CERT'
and crs.name not like '%cancel%'
and crs.name not like '%CANCELl%'
and crs.name not like '%CANCELL%'
and crs.version not like 'CONSTRUC%'
and crs.version Like :CoursesTitle
group by 3
--** Same code and union is repeated 52 times one per week of the year**--
)
Group by 1,2,3,4
Order By 3,4 ASC
如果有人对如何减少查询并获得相同的结果有任何聪明的想法，请发布它。真诚的Dpp
谢谢你的提示。我算出来了，这里是新的查询。
`Select "Week", "Year", SUM("Courses") as "Courses", "Sorter"
FROM (
select
case extract(week from BOOKING_DATE)
when 1 then 'Week # 1 (2 Jan) '
when 2 then 'Week # 2 (09 Jan) '
when 3 then 'Week # 3 (16 Jan) '
when 4 then 'Week # 4 (23 Jan)'
when 5 then 'Week # 5 (30 Jan)'
when 6 then 'Week # 6 (06 Feb)'
when 7 then 'Week # 7 (13 Feb)'
when 8 then 'Week # 8 (20 Feb)'
when 9 then 'Week # 9 (27 Feb)'
when 10 then 'Week # 10 (06 March)'
when 11 then 'Week # 11 (13 March)'
when 12 then 'Week # 12 (20 March)'
when 13 then 'Week # 13 (27 March)'
when 14 then 'Week # 14 (03 April)'
when 15 then 'Week # 15 (10 April)'
when 16 then 'Week # 16 (17 April)'
when 17 then 'Week # 17 (24 April)'
when 18 then 'Week # 18 (01 May)'
when 19 then 'Week # 19 (08 May)'
when 20 then 'Week # 20 (15 May)'
when 21 then 'Week # 21 (22 May)'
when 22 then 'Week # 22 (29 May)'
when 23 then 'Week # 23 (05 Jun)'
when 24 then 'Week # 24 (12 Jun)'
when 25 then 'Week # 25 (19 Jun)'
when 26 then 'Week # 26 (26 Jun)'
when 27 then 'Week # 27 (03 July)'
when 28 then 'Week # 28 (10 July)'
when 29 then 'Week # 29 (17 July)'
when 30 then 'Week # 30 (24 July)'
when 31 then 'Week # 31 (31 July)'
when 32 then 'Week # 32 (07 Aug)'
when 33 then 'Week # 33 (14 Aug)'
when 34 then 'Week # 34 (21 Aug)'
when 35 then 'Week # 35 (28 Aug)'
when 36 then 'Week # 36 (04 Sep)'
when 37 then 'Week # 37 (11 Sep)'
when 38 then 'Week # 38 (18 Sep)'
when 39 then 'Week # 39 (25 Sep)'
when 40 then 'Week # 40 (02 Oct)'
when 41 then 'Week # 41 (09 Oct)'
when 42 then 'Week # 42 (16 Oct)'
when 43 then 'Week # 43 (23 Oct)'
when 44 then 'Week # 44 (30 Oct)'
when 45 then 'Week # 45 (06 Nov)'
when 46 then 'Week # 46 (13 Nov)'
when 47 then 'Week # 47 (20 Nov)'
when 48 then 'Week # 48 (27 Nov)'
when 49 then 'Week # 49 (04 Dec)'
when 50 then 'Week # 50 (11 Dec)'
when 51 then 'Week # 51 (18 Dec)'
when 52 then 'Week # 52 (25 Dec)'
end as "Week" ,
extract(year from BOOKING_DATE) as "Year" ,
coalesce(count(Distinct crs.ID),0) as "Courses", extract(Week from BOOKING_DATE) as "Sorter"
from comp_Invoice IV
inner join Course CRS on IV.COD_COURSE=CRS.id
where
BOOKING_DATE between :StartDate and :EndDate
and crs.c_type = 'OS'
and crs.name not like '%Cancel%'
and crs.name not like 'CERT'
and crs.name not like '%cancel%'
and crs.name not like '%CANCELl%'
and crs.name not like '%CANCELL%'
and crs.version not like 'CONSTRUC%'
and crs.version Like :CourseTitle
Group by 1,2,4
UNION
select
case extract(week from BOOKING_DATE)
when 1 then 'Week # 1 (2 Jan) '
when 2 then 'Week # 2 (09 Jan) '
when 3 then 'Week # 3 (16 Jan) '
when 4 then 'Week # 4 (23 Jan)'
when 5 then 'Week # 5 (30 Jan)'
when 6 then 'Week # 6 (06 Feb)'
when 7 then 'Week # 7 (13 Feb)'
when 8 then 'Week # 8 (20 Feb)'
when 9 then 'Week # 9 (27 Feb)'
when 10 then 'Week # 10 (06 March)'
when 11 then 'Week # 11 (13 March)'
when 12 then 'Week # 12 (20 March)'
when 13 then 'Week # 13 (27 March)'
when 14 then 'Week # 14 (03 April)'
when 15 then 'Week # 15 (10 April)'
when 16 then 'Week # 16 (17 April)'
when 17 then 'Week # 17 (24 April)'
when 18 then 'Week # 18 (01 May)'
when 19 then 'Week # 19 (08 May)'
when 20 then 'Week # 20 (15 May)'
when 21 then 'Week # 21 (22 May)'
when 22 then 'Week # 22 (29 May)'
when 23 then 'Week # 23 (05 Jun)'
when 24 then 'Week # 24 (12 Jun)'
when 25 then 'Week # 25 (19 Jun)'
when 26 then 'Week # 26 (26 Jun)'
when 27 then 'Week # 27 (03 July)'
when 28 then 'Week # 28 (10 July)'
when 29 then 'Week # 29 (17 July)'
when 30 then 'Week # 30 (24 July)'
when 31 then 'Week # 31 (31 July)'
when 32 then 'Week # 32 (07 Aug)'
when 33 then 'Week # 33 (14 Aug)'
when 34 then 'Week # 34 (21 Aug)'
when 35 then 'Week # 35 (28 Aug)'
when 36 then 'Week # 36 (04 Sep)'
when 37 then 'Week # 37 (11 Sep)'
when 38 then 'Week # 38 (18 Sep)'
when 39 then 'Week # 39 (25 Sep)'
when 40 then 'Week # 40 (02 Oct)'
when 41 then 'Week # 41 (09 Oct)'
when 42 then 'Week # 42 (16 Oct)'
when 43 then 'Week # 43 (23 Oct)'
when 44 then 'Week # 44 (30 Oct)'
when 45 then 'Week # 45 (06 Nov)'
when 46 then 'Week # 46 (13 Nov)'
when 47 then 'Week # 47 (20 Nov)'
when 48 then 'Week # 48 (27 Nov)'
when 49 then 'Week # 49 (04 Dec)'
when 50 then 'Week # 50 (11 Dec)'
when 51 then 'Week # 51 (18 Dec)'
when 52 then 'Week # 52 (25 Dec)'
end as "Week",
extract(year from BOOKING_DATE) as "Year" ,
0 as "Courses",
extract(Week from BOOKING_DATE) as "Sorter"
from comp_Invoice
where
BOOKING_DATE between :StartDate and :EndDate
)
GROUP BY 1,2,4
Order by 2,4 ASC'
您可以像这样使用0值的联合:
select
'Week # ' || extract(week from GTT.DT) ||
' (' || extract(day from GTT.DT) ||
' ' || case extract(month from GTT.DT)
when 1 then 'Jan'
when 2 then 'Feb'
when 3 then 'Mar'
when 4 then 'Apr'
when 5 then 'May'
when 6 then 'Jun'
when 7 then 'Jul'
when 8 then 'Aug'
when 9 then 'Sep'
when 10 then 'Okt'
when 11 then 'Nov'
when 12 then 'Dec'
end || ')' as "Week",
extract(year from GTT.DT) as "Year", 0 as "Courses",
extract(week from GTT.DT) as "Sorter"
from
(
with recursive DATES as
(select
cast(:STARTDATE as date) as DT
from
RDB$DATABASE
union all
select
dateadd(day, 1, DT)
from
DATES
where
DT < cast(:ENDDATE as date)
)
select
DT
from
DATES
) GTT