如何根据不同表中的两个日期列获取值？

Question

I have two tables, table A has the Stock details and table B has the rates for certain product types valid for different periods.

create table tableA(
    Id int,
    StockId int, 
    AsOfDate date,
    Type_1_Bit bit,
    Type_2_Bit bit,
    Type_3_Bit bit,
    PurchaseDate date);
go

Create table TableB(
    Id int,
    BeginDate date,
    EndDate date,
    Rates decimal(8,5),
    Type_1_Bit bit,
    Type_2_Bit bit,
    Type_3_Bit bit);
go

I tried doing a left join with conditions but this logic gives me null rates. My resulting table should be like this--

select 
    a.Id,
    a.StockId,
    a.PurchaseDate,
    a.AsOfDate,
    b.Rates,
    b.Type_1_Bit,
    b.Type_2_Bit,
    b.Type_3_Bit
into #temp
from tableA a
left join TableB b
    on b.Type_1_Bit = a.Type_1_Bit
        and b.Type_2_Bit = a.Type_2_Bit
        and b.Type_3_Bit = a.Type_3_Bit
        and a.AsOfDate >= b.BeginDate
        and a.AsOfDate <= b.EndDate

What am I doing wrong here?

Answer 1

The first thing I notice is you're doing:

and a.AsOfDate >= b.BeginDate
and a.AsOfDate <= b.EndDate

both BeginDate and EndDate need to be equal? If not, try using the between operator instead.

a.AsOfDate between b.BeginDate and b.EndDate