的Java DB，怎么算排在联盟选择

Question

我想知道如何计算工会的行中的Java DB的这个选择

Select R.ID , R.CAPACITE from ASSISTE A 
join REPRESENTATION R on R.ID = A.IDREPRESENTATION 
where R.ID = 7 
union all 
SELECT R.id ,R.CAPACITE FROM BILLET B 
    join REPRESENTATION R on R.ID = B.IDREPRESENTATION 
    where R.ID = 7 

我想是这样

Select count(*) from (Select R.ID , R.CAPACITE from ASSISTE A 
    join REPRESENTATION R on R.ID = A.IDREPRESENTATION 
    where R.ID = 7 
union all 
SELECT R.id ,R.CAPACITE FROM BILLET B 
    join REPRESENTATION R on R.ID = B.IDREPRESENTATION 
    where R.ID = 7 ) 

但我有这个错误！

Error code 30000, SQL state 42X01: Erreur de syntaxe : Encountered "<EOF>" at line 7, column 21. 
Line 2, column 1 

请帮助：d

Answer 1

我想你忘了在末尾添加的别名。尝试与这样的事情：

Select count(*) from (
Select R.ID , R.CAPACITE from ASSISTE A 
    join REPRESENTATION R on R.ID = A.IDREPRESENTATION 
    where R.ID = 7 
union all 
SELECT R.id ,R.CAPACITE FROM BILLET B 
    join REPRESENTATION R on R.ID = B.IDREPRESENTATION 
    where R.ID = 7 
) A