如何用别名解释这个 SQL 错误？

Question

我正在尝试使用子查询运行一些代码，但我无法弄清楚为什么会出现错误。

select efile.*
from    
        (select can, 
        sum(case when tax_year = 2018 then IND_RETURNS_IN_SEASON+IND_RETURNS_EXT_SEASON else 0 end) as TY18_efiles,
        sum(case when tax_year = 2019 then IND_RETURNS_IN_SEASON+IND_RETURNS_EXT_SEASON else 0 end) as TY19_efiles
        from pcg_dm.ENT_AGG_CUST_MEASURES
        where can in 
                (select distinct can
                from pcg_dm.ENT_AGG_CUST_MEASURES
                where tax_year in (2019,2019)
                )
        group by 1
        order by 1
        limit 2000
        ) AS efile
join    
        (select can, st.STATE AS TY18_state
        from pcg_dm.ENT_AGG_CUST_ATTRIBUTES AS st
        where tax_year = 2018
        limit 2000
        )AS 18State
        
on
         efile.can=18state.can

我收到以下错误。

[代码：4856，SQL 状态：42601] [Vertica]VJDBC 错误：“18”或附近的语法错误

知道问题是什么吗？

Answer 1

您在 from 子句之后的第 18 行中为表指定了别名。尝试删除它并重新运行查询。