Question

I am developing web application using JSP and Servlet (IDE: Eclipse, Container: Tomcat7.0, DB: Oracle 10)

I want to get data from two table in a single query

Query:

query = "select * from PROTOCOL as a, ACTIONS as b where a.PROTOCOL_ID = b.PROTOCOL_ID";

But after running the application I am getting the following exception:

java.sql.SQLException: ORA-00933: SQL command not properly ended

is there anything wrong in query?

Answer 1

The problem you have is keyword AS. This is used for columns in SELECT section. It is not valid for FROM where you specify the tables.

You have

select * from PROTOCOL as a, ACTIONS as b

should be

select * from PROTOCOL a, ACTIONS b...

From Oracle Docs

t_alias

Specify a correlation name, which is alias for the table, view,
materialized view, or subquery for evaluating the query. This alias is
required if the select list references any object type attributes or
object type methods. Correlation names are most often used in a
correlated query. Other references to the table, view, or materialized
view throughout the query must refer to this alias.

Example:

SELECT select_list 
    FROM table1 t_alias1 
    WHERE expr operator 
        (SELECT column_list 
            FROM table2 t_alias2 
            WHERE t_alias1.column 
               operator t_alias2.column);