內部聯接上（Oracle）的

Question

下面的查詢在Oracle中的錯誤的語法，而是工作在SQL Server和MySQL的：

SELECT COUNT(DISTINCT end_.cntn_pk) 
FROM content end_ 
INNER JOIN contentrelation AS start_to_end__29 
    ON end_.cntn_pk = start_to_end__29.corl_fk_to 

我有以下錯誤：

ERROR DSResponseUtil - Unexpected exception 
java.sql.SQLSyntaxErrorException: ORA-00905: missing keyword 

Oracle不接受別名？如何使它三個數據庫類型工作

感謝您的幫助

Answer 1

甲骨文不接受關鍵字爲對錶的別名

Answer 2

甲骨文只接受AS列別名，但不爲表。 但是，AS不是必需的，您可以始終避免它沒有問題：

SQL> select 1 as one from dual; 

     ONE 
---------- 
     1 

SQL> select 1 one from dual; 

     ONE 
---------- 
     1 

SQL> select 1 one from dual d; 

     ONE 
---------- 
     1 

SQL> select 1 one from dual as d; 
select 1 one from dual as d 
         * 
ERROR at line 1: 
ORA-00933: SQL command not properly ended