Invalid Indentifier error using UNION ALL?

Question

Can someone tell me why this would give me the error: ORA-00904: "WAIT_TIME": invalid identifier.
It must be something with the UNION ALL because it works fine if i run just one of the queries at a time.
Thanks
Deanna
selecT WAIT_TIME||'Minutes.'||','||COUNT(WAIT_TIME)as "0-10Min,COUNT"
froM MOTOR_ASSIST2
WHERE WAIT_TIME BETWEEN 0 AND 10 and ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
UNION ALL
select WAIT_TIME||'Minutes.'||','||COUNT(WAIT_TIME)as "11-30Min,COUNT"
froM MOTOR_ASSIST2
where WAIT_TIME BETWEEN 11 AND 30 and ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
UNION ALL
select WAIT_TIME||'Minutes.'||','||COUNT(WAIT_TIME)as "31-60Min,COUNT"
from MOTOR_ASSIST2
where WAIT_TIME BETWEEN 31 AND 60 and ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
UNION ALL
select WAIT_TIME||'Minutes.'||','||COUNT(WAIT_TIME) as "61Min+,COUNT"
from MOTOR_ASSIST2
where WAIT_TIME BETWEEN 61 AND 1000 and ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
GROUP BY WAIT_TIME
ORDER BY WAIT_TIME;

Answer 1

Data
1(Min)
1(Min)
1(Min)
2(Min)
5(Min)               
9(Min)
9(Min)
9(Min)               
10(Min)               
11(Min)               
15(Min)     
17(Min)
20(Min)
30(Min)
60(Min)
99(Min)
999(Min)
Output
                _0-10MIN                     11-30MIN                     31-60MIN                     61+MIN_
     1(Min):Count:3     11(Min):Count:1     60(Min):Count:1     99(Min):Count:1
     9(Min):Count:3     20(Min):Count:1                          999(Min):Count:1
     2(Min):Count:1     15(Min):Count:1                         
     10(Min):Count:1     30(Min):Count:1          
     5(Min):Count:1     17(Min):Count:1
Total:     Count: 9                     Count:5                     Count:1                     Count:2
Query
WITH c1 as (select row_number() over (order by wait_time)as rn
                      ,CASE WHEN wait_time BETWEEN 0 AND 10 THEN WAIT_TIME||'(Min):Count:'||COUNT(*) ELSE NULL END AS "0-10MIN"
                from MOTOR_ASSIST2
                where wait_time between 0 and 10 AND ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
group by wait_time
ORDER BY WAIT_tIME)
        ,c2 as (select row_number() over (order by wait_time) as rn
                      ,CASE WHEN wait_time BETWEEN 11 AND 30 THEN wait_time||'(Min):Count:'||COUNT(*) ELSE NULL END AS "11-30MIN"
                from MOTOR_ASSIST2
               where wait_time between 11 and 30 AND ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
group by wait_time
ORDER BY WAIT_TIME)
       ,c3 as (select row_number() over (order by wait_time) as rn
                     ,CASE WHEN wait_time BETWEEN 31 AND 60 THEN wait_time||'(Min):Count:'||COUNT(*) ELSE NULL END AS "31-60MIN"
               from MOTOR_ASSIST2
               where wait_time between 31 and 60 AND ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
group by wait_time
ORDER BY WAIT_TIME)
       ,c4 as (select row_number() over (order by wait_time) as rn
                     ,CASE WHEN wait_time >= 61 THEN wait_time||'(Min):Count:'||COUNT(*) ELSE NULL END AS "61+MIN"
               from MOTOR_ASSIST2
               where wait_time >= 61 AND ((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
group by wait_time
ORDER BY WAIT_TIME)
,cgrand as (select row_number() over (order by wait_time) as rn,COUNT(WAIT_TIME)AS "TOTAL",wait_time||'(Min):Total:'||COUNT(*) as "TOTAL_WAIT_TIME"
              from motor_assist2
              where((:p53_fiscal_yr IS NULL
OR :p53_fiscal_yr = TO_CHAR (ADD_MONTHS (datetime, 6), 'YYYY'))
OR (:p53_month IS NULL OR :P53_month = TO_CHAR(DATETIME,'MM')
AND (:p53_year IS NULL OR :p53_year = TO_CHAR(DATETIME,'YYYY'))))
group by wait_time
ORDER BY WAIT_TIME)
select "0-10MIN","11-30MIN", "31-60MIN", "61+MIN","TOTAL_WAIT_TIME","TOTAL"
   from cgrand
      LEFT OUTER JOIN c1 ON  c1.rn = cgrand.rn
      LEFT OUTER JOIN c2 ON  c2.rn = cgrand.rn
      LEFT OUTER JOIN c3 ON  c3.rn = cgrand.rn
      LEFT OUTER JOIN c4 ON  c4.rn = cgrand.rn
       order by "TOTAL";