如何加入 OpenEdge SQL 的第一行？

Question

在 SQL 中加入第一行应该和加入内部选择一样简单

select so_nbr, sod_line last_line
  from so_mstr
  join sod_det on sod_det.rowid = (select top 1 sod_det.rowid
                                     from sod_det
                                    where sod_nbr = so_nbr
                                    order by sod_line desc) x
 where so_ord_date > curdate() - 60

不幸的是，我得到了：Error code -20302, SQL state HY000: [DataDirect][OpenEdge JDBC Driver][OpenEdge] TOP clause used in unsupported context. (13694)

注意，我卡在 OE10.1C 上，无法升级。

Answer 1

根据Abe Voelker's Answer：

OpenEdge 11.2 增加了对OFFSET and FETCH clauses 的支持 到 SQL SELECT 查询；低于 11.2 的 OpenEdge 版本不 支持OFFSET/FETCH。

来自11.2 product documentation 《SQL 参考》文档：

The OFFSET clause specifies the number of rows to skip, before starting to return rows
from the query expression. The FETCH clause specifies the number of rows to return,
after processing the OFFSET clause.

值得注意的是 TOP 和 OFFSET/FETCH 子句是 互斥 - TOP 不能用于使用 OFFSET 或 FETCH。

试试这个

  SELECT so_nbr,sod_line As last_line
  FROM so_mstr
       JOIN sod_det ON sod_det.rowid = (SELECT sod_det.rowid 
                                        FROM sod_det WHERE sod_nbr = so_nbr
                                        ORDER BY sod_line Desc 
                                        FETCH FIRST 1 ROWS ONLY) x
  WHERE so_ord_date > curdate() - 60