with t as (SELECT ZZ1.AUDIT_TIMESTAMP AUDIT_TIMESTAMP, ZZ1.AUDIT_TRANSACTION_TYPE AUDIT_TRANSACTION_TYPE, ZZ1.AUDIT_USER_NAME AUDIT_USER_NAME, ZZ1.AUDIT_TRUE_NULLS AUDIT_TRUE_NULLS, ZZ1.GUN_MAKE_ID GUN_MAKE_ID, ZZ1.NCIC_CODE NCIC_CODE, ZZ1.COUNTRY COUNTRY, ZZ1.MANUFACTURER_NAME MANUFACTURER_NAME, ZZ1.GUN_COMMENT GUN_COMMENT, ZZ1.CREATOR_ID CREATOR_ID, ZZ1.CREATOR_DATE CREATOR_DATE, ZZ1.UPDATOR_ID UPDATOR_ID, ZZ1.UPDATOR_DATE UPDATOR_DATE, ZZ1.REC_ID REC_ID FROM ZZ_GUN_MAKE_CODES ZZ1 union all select sysdate, 'C', null, null, ZZ2.GUN_MAKE_ID, ZZ2.NCIC_CODE, ZZ2.COUNTRY, ZZ2.MANUFACTURER_NAME, ZZ2.GUN_COMMENT, ZZ2.CREATOR_ID, ZZ2.CREATOR_DATE, ZZ2.UPDATOR_ID, ZZ2.UPDATOR_DATE, ZZ2.REC_ID FROM GUN_MAKE_CODES ZZ2 where exists ( select * from ZZ_GUN_MAKE_CODES where GUN_MAKE_ID= ZZ2.GUN_MAKE_ID )) select AUDIT_TIMESTAMP, AUDIT_TRANSACTION_TYPE, AUDIT_USER_NAME, GUN_MAKE_ID, NCIC_CODE, COUNTRY, MANUFACTURER_NAME, GUN_COMMENT, CREATOR_ID, CREATOR_DATE, UPDATOR_ID, UPDATOR_DATE, REC_ID from ( select AUDIT_TIMESTAMP, AUDIT_TRANSACTION_TYPE, AUDIT_USER_NAME, GUN_MAKE_ID,( CASE WHEN audit_transaction_type in ( 'C','D') then NCIC_CODE ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),6,1),'N') ='N' THEN lead(NCIC_CODE ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) NCIC_CODE,( CASE WHEN audit_transaction_type in ( 'C','D') then COUNTRY ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),7,1),'N') ='N' THEN lead(COUNTRY ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) COUNTRY,( CASE WHEN audit_transaction_type in ( 'C','D') then MANUFACTURER_NAME ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),8,1),'N') ='N' THEN lead(MANUFACTURER_NAME ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) MANUFACTURER_NAME,( CASE WHEN audit_transaction_type in ( 'C','D') then GUN_COMMENT ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),9,1),'N') ='N' THEN lead(GUN_COMMENT ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) GUN_COMMENT,( CASE WHEN audit_transaction_type in ( 'C','D') then CREATOR_ID ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),10,1),'N') ='N' THEN lead(CREATOR_ID ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) CREATOR_ID,( CASE WHEN audit_transaction_type in ( 'C','D') then CREATOR_DATE ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),11,1),'N') ='N' THEN lead(CREATOR_DATE ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) CREATOR_DATE,( CASE WHEN audit_transaction_type in ( 'C','D') then UPDATOR_ID ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),12,1),'N') ='N' THEN lead(UPDATOR_ID ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) UPDATOR_ID,( CASE WHEN audit_transaction_type in ( 'C','D') then UPDATOR_DATE ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),13,1),'N') ='N' THEN lead(UPDATOR_DATE ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) UPDATOR_DATE,( CASE WHEN audit_transaction_type in ( 'C','D') then REC_ID ELSE (CASE WHEN NVL(SUBSTR(lead(AUDIT_TRUE_NULLS) over (partition by GUN_MAKE_ID order by audit_timestamp asc),14,1),'N') ='N' THEN lead(REC_ID ignore nulls) over (partition by GUN_MAKE_ID order by audit_timestamp asc) END) END) REC_ID,row_number() over (partition by GUN_MAKE_ID order by audit_timestamp asc) as rn from t )