您可以修改查询以使用join
,如下所示:
-之前-此自联接中使用的所有字段都来自相同的'Prime'表:
选择a。*,
b.column1作为column1b,
b.column2作为column2b,
b.column3作为column3b,
b.column4作为column4b,
b.column5作为column5b,
b.next_column5作为next_column5b,
b.column6 as column6b,
b.column7 as column7b,
b.column8 as column8b,-
b.column9作为column9b,
b.column10 as column10b,
案例
[当a.column5> b.column5然后然后a.column5] >>
[当b.column5>然后a.column5然后b.column5] >>
ELSE a.column5
END作为TheStart,
案例
当b.next_column5> today()和b.column8 = 0时>
然后1
其他0
以TheEnd结尾
从素数a到素数b
a.column11 = b.column11
和a.conper = b.conper
和a.condtn = b.condtn
和a.genass = b.genass
和('A_B','A_nB')中的a.column3
和b.column3 ='B'
和a.prime_sum_c> 0
按列11,列1,列2,列6,列7,列5的顺序
-之后-
[column8]字段现在来自另一个名为[OtherTable]的表
问题:为了继续使用SELF JOIN并考虑到我们现在正在处理2个不同的表,我应该如何写下新代码[OtherTable] .column8
-之前-此自联接中使用的所有字段都来自相同的'Prime'表:选择a。*,b.column1作为column1b,b.column2作为column2b,b.column3作为column3b,b.column4如column4b,b ....
您可以修改查询以使用join
,如下所示:
select
a.*,
b.column1 as column1b,
b.column2 as column2b,
b.column3 as column3b,
b.column4 as column4b,
b.column5 as column5b,
b.next_column5 as next_column5b,
b.column6 as column6b,
b.column7 as column7b,
o.column8 as column8b, -- from OtherTable
b.column9 as column9b,
b.column10 as column10b,
CASE
WHEN a.column5 > b.column5 THEN a.column5
WHEN b.column5 > a.column5 THEN b.column5
ELSE a.column5
END AS TheStart,
case
when b.next_column5 > today() and o.column8 = 0
then 1
else 0
end as TheEnd
from prime a
inner join prime b on a.column11 = b.column11
and a.conper = b.conper
and a.condtn = b.condtn
and a.genass = b.genass
left join OtherTable o on <<your join condition>> -- join with OtherTable here
where a.column3 in ('A_B','A_nB')
and b.column3 = 'B'
and a.prime_sum_c > 0
order by column11, column1, column2, column6, column7, column5
您可以修改查询以使用join
,如下所示: