oracle-sqldeveloper

I have a transdate column of varchar2 type which has the following entrees 01/02/2012 01/03/2012 etc. I converted it in to date format in another column using to_date function. This is the format i got. 01-JAN-2012 03-APR-2012 When I'm trying to extract the weekno, i'm getting all null values. select to_char(to_date(TRANSDATE), 'w') as weekno from tablename. null null How to get weekno from date in the above format? Wolf After converting your varchar2 date to a true date datatype, then convert back to varchar2 with the desired mask: to_char(to_date('01/02/2012','MM/DD/YYYY'),'WW') If you want

I want to use Oracle SQL Developer to generate an ER diagram for my DB tables but I am new to Oracle and this tool. What is the process for creating an ER diagram in SQL Developer? Sergei Mardiyants Create a diagram for existing database schema or its subset as follows: Click File → Data Modeler → Import → Data Dictionary . Select a DB connection (add one if none). Click Next . Check one or more schema names. Click Next . Check one or more objects to import. Click Next . Click Finish . The ERD is displayed. Export the diagram as follows: Click File → Data Modeler → Print Diagram → To Image

I am wanting to output a Query to a CSV file and am using the below as a small test; spool c:\test.csv select /*csv*/ username, user_id, created from all_users; spool off; but the output has the actual select statment as the first line > select /*csv*/ username user_id created from all_users USERNAME USER_ID CREATED REPORT 52 11-Sep-13 WEBFOCUS 51 18-Sep-12 Is there a way to prevent this? I tried SET Heading Off thinking that might do it, but it did not change. I am using SQL Developer an running as script. Thanks Bruce Unfortunately SQL Developer doesn't fully honour the set echo off command