Re: Simple SQL Query Question

[novicedba]

SELECT STATION, EMISSION_FREQ, RECEPTION_FREQ, DECODE(SUBSTR(NVL(TO_CHAR(RECEPTION_FREQ),'NONE'),1,1),'N',EMISSION_FREQ*1,EMISSION_FREQ*2) VALUE FROM TEST;   STATION    EMISSION_FREQ   RECEPTION_FREQ     VALUE ----------         -------------                --------------                    --------- STAT1              192.5                  193.5                          385 STAT2              192.5                                                    192.5 STAT2              194                                                       194 STAT2              193.5                  194.5                          387 STAT2              195                                                       195   I did not understand what you meant by 'And I would like to select the number of frequencies, sort of count(*), for a given station and multiply that value by 2 ' so what I have done is if     the reception_freq is null (that would mean there is only emission_freq ) then     value=emission_freq*1 else     value=emission_freq*1 end if   Hope this is what you wanted   coz I am a novice Oracle Certifiable DBBS ----- Original Message ----- From: ALEMU Abiy To: Multiple recipients of list ORACLE-L Sent: Monday, July 02, 2001 1:00 PM Subject: Simple SQL Query Question I've a table with the following structure and sample data :   Station        Emission_Freq        Reception_Freq --------        -----------------        ------------------ STAT1        192.5                        193.5 STAT2        193    STAT2        194 STAT2        193.5                        194.5 STAT2        195     And I would like to select the number of frequencies, sort of count(*), for a given station and multiply that value by 2 if the station has Emission frequency and reception frequency and multiply by one if the station has only the emission frequency or only the reception frequency.  I don't know how to use a condition in SQL.  I'm sure that it's possible to do it but I don't know how.  Can anybody help me ? ------------------------------------------------------------------------------------ @biy @lemu [EMAIL PROTECTED] Database Administration Engineer France