Tsql 检索多个摘要
在这个场景中有四个表:TableA、TableB和TableC、TableD和TableETsql 检索多个摘要,tsql,stored-procedures,sql-server-2012,Tsql,Stored Procedures,Sql Server 2012,在这个场景中有四个表:TableA、TableB和TableC、TableD和TableE TableA -> TableB = 1-to-many TableB -> TableC = 1-to-many TableB -> TableD = 1-to-1 TableC -> TableE = 1-to-1 TableA { Id (PK), Field1 (float), DateField (DateTime) } TableB { Id (PK), TableA
TableA -> TableB = 1-to-many
TableB -> TableC = 1-to-many
TableB -> TableD = 1-to-1
TableC -> TableE = 1-to-1
TableA { Id (PK), Field1 (float), DateField (DateTime) }
TableB { Id (PK), TableAId (FK), TableDId (FK), Field2 (float) }
TableC { Id (PK), TableBId (FK), TableEId (FK), Field3 (float) }
TableD { Id (PK), Type (tinyint) }
TableE { Id (PK), Type (tinyint) }
表B中的一些记录(但不是所有记录)包含表C中的子记录。根据某个日期范围(从到),我需要从TableA中获取所有记录及其相关记录,并计算:
- 表A.1摘要
- TableB.Field2汇总,按TableD.Type分组(共有5种不同类型)
- 表C.Field3的摘要,由TableE.Type(有4种不同的类型)提取
SELECT SUM(a.Field1) FROM TableA a INNER JOIN TableB b ON a.Id = b.TableAId WHERE a.DateField BETWEEN DateFrom AND DateTo
SELECT SUM(b.Field2) FROM TableA a INNER JOIN TableB b ON a.Id = TableD d ON b.TableDId=d.Id WHERE a.DateField BETWEEN DateFrom AND DateTo AND d.Type = 1
SELECT SUM(b.Field2) FROM TableA a INNER JOIN TableB b ON a.Id = TableD d ON b.TableDId=d.Id WHERE a.DateField BETWEEN DateFrom AND DateTo AND d.Type = 2 // etc to 5
SELECT SUM(c.Field3) FROM TableA a INNER JOIN TableB b ON a.Id = b.TableAId INNER JOIN TableC c ON b.Id=c.TableBId INNER JOIN TableE ON c.TableEId=e.Id WHERE a.DateField BETWEEN DateFrom AND DateTo AND e.Type = 1 // 3x this query, only type is different
我认为最好的方法是使用CTE在一个查询中编写整个内容,并让SQL Server的优化器找出执行该内容的最佳方法。这样我们就不会:
with a as (select * from tableA where datefield between datefrom and dateto),
b as ( select * from tableB where tableB.tableAid = a.id)
select null, sum(a.field1) from a
union
select d.type, sum(b.field2)
from b
join tableD d on d.id = b.tableDid
group by d.type
union
select e.type, sum(c.field3)
from tableC c
join b on b.id = c.tableBid
join tableE e on e.id = c.tableEid
合计还是其他“汇总”?任何分组?总和聚合,字段2和字段3上都需要分组,如上所述,这两个分组都是每种类型的分组。