Pervasive-SQL，INNER JOIN與UNION結果

Question

我嘗試使用從UNION子查詢返回的結果JOIN表。但是我從下面的查詢中得到語法錯誤。使用Pervasive數據庫可以實現這樣的任務嗎？我使用的是Pervasive v8。

SELECT * FROM 
Table1 INNER JOIN Table2 ON Table1.BKAR_INV_NUM = Table2.BKAR_INVL_INVNM 
INNER JOIN 
(
SELECT BKAR_INVL_INVNM as SO_Num, BKAR_INVL_CNTR as Line, BKAR_INVL_ASD as Due_Date FROM Table3 
UNION SELECT BKAR_INVL_INVNM as SO_Num, BKAR_INVL_CNTR as Line, BKAR_INVL_ASD as Due_Date FROM Table4 WHERE BKAR_INVL_ASD IS NOT NULL 
) AS SubTable 
ON SubTable.SO_Num = Table1.BKAR_INV_SONUM AND SubTable.Line = Table2.BKAR_INVL_CNTR 

Answer 1

根據我的研究，Pervasive v8支持UNION，但不支持子查詢。