我有以下查询哪些需要很长时间我的看法。我不能使用索引,因为它是视图,我在我的视图中使用Select *语句。如何优化内部视图查询
SELECT *
FROM shell_v3 v3,
Shell_v41 v41,
core_demandsupply ds1,
core_demandsupply ds2
WHERE v41.profile_group = v3.profile_group
AND v41.company = v3.company
AND v41.product = v3.product
AND v41.source_facility = ds2.facility
AND v41.facility = ds1.facility
AND case when ds1.reqd_date < getdate()
then getdate()
else ds1.reqd_date
end between v41.effective_Date and V41.Inactive_Date
请张贴架构和EXPLAIN /执行计划 –