table1.date1 = 从雅典娜的 table2.monthyear 中的 date1 获取前 12 个月的数据？ 如何在年月中获取 12 个月之前的数据？

Question

select 
   amt1,
   amt2 
from table2 
inner join table1 on table1.field1 = table2.field2 
        and table2.month_year between (substring(table1.date1,1,6) -12 month)

Answer 1

SELECT
    amt1,
    amt2
FROM    Table2      AS t2
INNER JOIN Table1 AS t1
    ON t1.Field1 = t2.Field2
    AND SUBSTRING(t1.DATE1, 1, 6) BETWEEN LEFT(t2.month_year, 4) + CAST(CAST(RIGHT(t2.month_year, 2) AS int) - 12 AS varchar(2)) AND t2.month_year;