Alias problem in query error: ORA-00923

Hi,
While using alias for query as below I am getting the below error:
ORA-00923: FROM keyword not found where expected
Select (b.forecast_value * a.Spec_P90_cpuutil) as "ForecastSPECCPU" ||',' ||a.Spec_P90_cpuutil as "alias" FROM SM_System_Capacity a ,R_CustomerForecast b ,K_SystemCapacity d where TO_CHAR(a.ta_period,'YYYY-MM-DD') = '2007-11-01' and b.ta_period IS NOT NULL and a.target_name = d.dsi_target_name and a.target_name = 'xxxx';
"Select a.dsi_target_name ,a.dsi_table_key ,b.ta_period ,b.AVGAVGcpuutil, b.AVGAVGmemutil, b.AVGMAXcpuutil, b.P90AVGmemutil, (b.AVGAVGcpuutil * a.power_rating_value / 100) SPEC_Cpu_Util, (b.AVGMAXcpuutil* a.power_rating_value / 100) SPEC90_Cpu_Util,a.cpu, a.mhz, a.ram,a.os,a.applicationcomp,a.systemcomp,a.dsi_table_key,a.power_rating_value,(a.power_rating_value *80/ 100) System_Threshold,a.power_rating_value Business_Threshold, b.dsi_key_id_ from K_SystemCapacity a,SM_Systemtest b where a.dsikey = b.dsi_key_id_";
The full query is as above on which I used the || operator and got the same error, so I tried in parts which is also not working.
Please let me know how can I use alias for such queries.
Thanks,
Arun

you cannot concatenate aliased columns together
Select (b.forecast_value * a.Spec_P90_cpuutil) as "ForecastSPECCPU" ||',' ||a.Spec_P90_cpuutil as "alias"
you can select two columns
Select (b.forecast_value * a.Spec_P90_cpuutil) as "ForecastSPECCPU", a.Spec_P90_cpuutil as "alias"
or concat them, and then alias
Select (b.forecast_value * a.Spec_P90_cpuutil) ||',' ||a.Spec_P90_cpuutil as "alias"

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RETURN 1;
EXCEPTION WHEN OTHERS THEN
    PROC_LOG('Failed in INSERT_BATCH');
    PROC_LOG('SQL Error : ' || SUBSTR(SQLERRM,1,1000));
    RETURN -1;
END INSERT_BATCH;
desc PROD.BATCH_STATEMENT
QUEUE_ID           NUMBER(15)                 NOT NULL
TABLE_ID           NUMBER(2)                  NOT NULL
STATEMENT          VARCHAR2(4000 BYTE)        NOT NULL
QUEUE_SEQUENCE_ID NUMBER(5)                  NOT NULL
Some how when its calling the insert_batch , its giving me the error in the logs as below:
04:01:41 - Update Tms_Process_counter varSTMT --UPDATE PROD.TMS_PROCESS_COUNTER SET last_count_added = last_count_added+1 WHERE process_name = 'DAILY_GDS_COUNT' AND COUNTER_IND = '750FD130'
04:01:41 - INSIDE INSERT_BATCH IRC : UPDATE PROD.TMS_PROCESS_COUNTER SET last_count_added = last_count_added+1 WHERE process_name = 'DAILY_GDS_COUNT' AND COUNTER_IND = '750FD130'
04:01:41 - Failed in INSERT_BATCH
04:01:41 - SQL Error : ORA-14551: cannot perform a DML operation inside a query

Some how when its calling the insert_batch , its giving me the error in the logs as below:
04:01:41 - SQL Error : ORA-14551: cannot perform a DML operation inside a query
Yes - and the exception is telling you EXACTLY what the problem is. You have a query
IF INSERT_BATCH(99,varSTMT) > 0 THEN
And you are performing a DML operation inside that query:
INSERT INTO BATCH_STATEMENT(QUEUE_ID,TABLE_ID,STATEMENT,QUEUE_SEQUENCE_ID)
    VALUES (numQUEUE_ID,numTABLE_ID,varSQL_STATEMENT,1);
Like the exception says: you can't do that.
You need to call the function using PL/SQL and capture the return value into a variable. Then test that variable:
myVar := INSERT_BATCH(99,varSTMT);
if myVar > 0 THEN

Error ORA-01652 while running select query

A select query returning millions of records is returning the following error.
SQL Error [
ORA-01652: unable to extend temp segment by 128 in tablespace TEMP
We requested DBA to increased the TEMP tablespace. He increased it to 20GB and also, changed to Autoextent.
When we executed the query again, we got the same error ?
What could be the reason of this issue and how it can be resolved ?

All sort operations that don't fit into the SORT_AREA_SIZE will go to the temp tablespace (they can be seen as direct writes in the trace file).
It can easy be the case, that your temp tablespace needs to be many GB in size [we have a table with millions of rows and for the loading/merging our temp is 80GB in size].
May be you can change your process of loading i.e. with this select you fill a intermediate table (with CTAS) and do your processing there or even try to do the processing in SQL while building the table. You could also try to do the processing with a cursor and BULK COLLECT LIMIT 100 and then inserting into the target table with the FORALL statement.

Alias problem in query error: ORA-00923

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