子查询中的多个联接

Question

我正在编写一个查询，该查询从另一个表中引入期间，因此如果今年的期间为201901-201912，则明年= 202001-202012，而去年的期间为201801-201812，则为财务期间。

当前总帐期间表显示201903，即2018年6月。我想编写一个查询，以便我可以得到今年的下一年和去年的日期，我的加入只能返回ONE，即今年或明年或去年，但是我希望它返回所有三个。我该怎么做？

SELECT 
yearfrom,
period,
fld_from,
fld_to,
fld_desc,
[ThisYear] = ((select(LEFT(Gl_GLPARAM.PERIOD,4)) from Gl_GLPARAM)),
[LastYear] = ((select(LEFT(Gl_GLPARAM.PERIOD,4))-1 from Gl_GLPARAM)),
[NextYear] = ((select(LEFT(Gl_GLPARAM.PERIOD,4))+1 from Gl_GLPARAM))


FROM GL_YEARPDET
right join (select(LEFT(Gl_GLPARAM.PERIOD,4)) as 'ThisYear' from Gl_GLPARAM) 
as T1 on GL_YEARPDET.YearFrom = t1.ThisYear

我需要以某种方式将上述内容添加到子查询中

right join (select(LEFT(Gl_GLPARAM.PERIOD,4))+1 as 'NextYear' from 
Gl_GLPARAM) as T2 on GL_YEARPDET.YearFrom = t2.NextYear
right join (select(LEFT(Gl_GLPARAM.PERIOD,4))+1 as 'LastYear' from 
Gl_GLPARAM) as T3 on GL_YEARPDET.YearFrom = t3.LastYear

SqlSubqueryresult

SampleTable

Answer 1

 FROM GL_YEARPDET
 where YearFrom IN( ((select(LEFT(Gl_GLPARAM.PERIOD,4)) from Gl_GLPARAM)), 
 ((select(LEFT(Gl_GLPARAM.PERIOD,4))-1 from Gl_GLPARAM)), 
 ((select(LEFT(Gl_GLPARAM.PERIOD,4))+1 from Gl_GLPARAM)))

where子句已解决我的问题。