Question

SELECT * FROM(
        (SELECT 
            count(DISTINCT RECEPIENT_ID) as NoOfUsers,
            TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD') as accDate 
        FROM 
            ALRT_PLATFORM_ALRT_HSTRY  
        where 
            APPL_CD like 'EBP' and 
            ALRT_RSPNS_FROM_CLIENT_ID like 'BB' 
            group by TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD')
        ) b,

        (SELECT 
            count(DISTINCT RECEPIENT_ID) as NoOfUsers, 
            TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD') as accDate 
        FROM 
            ALRT_PLATFORM_ALRT 
        where 
            APPL_CD like 'EBP' and 
            ALRT_RSPNS_FROM_CLIENT_ID like 'BB' 
            group by TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD')
        ) f   
        )

this query is returning the data in the following format:

NOOFUSERS              ACCDATE    NOOFUSERS              ACCDATE    
---------------------- ---------- ---------------------- ---------- 
2                      2009-12-21 1                      2010-03-01 
2                      2009-12-21 2                      2010-03-02 
2                      2009-12-21 1                      2010-03-03 
1                      2009-12-23 1                      2010-03-01 

is it possible to club the reuslt of two tables:
Am expecting the data to be in this format:

NOOFUSERS              ACCDATE    
---------------------- ---------- 
2                      2009-12-21 
1                      2009-12-23 
1                      2010-01-02 
1                      2010-01-04 //till here its table one data
1                      2010-03-01 //from here its table TWO data
2                      2010-03-02 
1                      2010-03-03 

Thank you 🙂

Answer 1

Using UNION ALL instead of subselected columns will append subsequent UNION ALL statements to the original select. Be wary you need the same amount of columns in each select statement.

UNION ALL makes sure the combined result is not sorted/mingled (first query is returned before second). A regular UNION can/will mingle/mix/sort the result.

SELECT 
            count(DISTINCT RECEPIENT_ID) as NoOfUsers,
            TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD') as accDate 
        FROM 
            ALRT_PLATFORM_ALRT_HSTRY  
        where 
            APPL_CD like 'EBP' and 
            ALRT_RSPNS_FROM_CLIENT_ID like 'BB' 
            group by TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD')


UNION ALL

       SELECT 
            count(DISTINCT RECEPIENT_ID) as NoOfUsers, 
            TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD') as accDate 
        FROM 
            ALRT_PLATFORM_ALRT 
        where 
            APPL_CD like 'EBP' and 
            ALRT_RSPNS_FROM_CLIENT_ID like 'BB' 
            group by TO_CHAR(ACTN_TAKE_DATA_TM,'YYYY-MM-DD')