How to use WITH clause with UNION ALL in oracle SQL - sql

Question

GOOD Day for you guys , i have a question regarding the with clause with union all the select statment in the procudre is working fine but when i'm trying to add condiotion to each with clause it giving this error ("Inappropriate into") the below is an example of what i'm trying to do :
-------------------------------------------SOO1
WITH SS AS (( SELECT /) */
COUNT(ROWNUM) AS S001
FROM x.MSSE A
WHERE (SUCCESS_STATUS='F'
UNION ALL
SELECT
COUNT(ROWNUM) AS S001
FROM X.MSSE A
WHERE (SUCCESS_STATUS='N'
),
S333 AS
(SELECT /*+ INDEX (A MSSEADTD_SI02) */
COUNT(ROWNUM) AS S333_
FROM X.MSSE A
WHERE (SUCCESS_STATUS='M' )
union all
SELECT /*+ INDEX (A MSSEORMD_SI03) */
COUNT(ROWNUM) AS S333_
FROM HHL7.MSSEORMD A
WHERE (SUCCESS_STATUS='A'
),
LIS AS
(SELECT /*+ INDEX (A MSSEORUD_SI02) */
COUNT(ROWNUM)AS LIS_
FROM A.MSS A
WHERE (SUCCESS_STATUS='D')
SELECT SUM(S001) INTO Value_A
FROM
(
SELECT S001 FROM SS
)
UNION ALL
SELECT SUM(S333_) INTO VALUE_C
FROM
(SELECT S333_ FROM S333)
UNION ALL
SELECT SUM(LIS_)INTO VALUE_D FROM
(SELECT LIS_ FROM LIS)
IF Value_A > 30000 THEN
--DO THIS
IF VALUE_C > 30000 THEN
--DO THAT
--...ETC

Answer 1

The way I see it, it is UNION - but somewhat different from the one you wrote because part of data comes from one table (x.msse) and another from hh17.msseormd. It is unclear whether you can (or can not) join these two tables so ... union can be one option.
As number and datatype of columns returned by select statements in union must match, the 2nd select selects two 0 constant values.
The final select sums values returned in the CTE.
with temp as
(-- values from X.MSSE table
select
sum(case when success_status in ('F', 'N') then 1 else 0 end) s001,
sum(case when success_status in ('M') then 1 else 0 end) s333,
sum(case when success_status in ('D') then 1 else 0 end) lis
from x.msse
union all
-- values from HH17.MSSEORMD table
select
0 s001,
sum(case when success_status in ('A') then 1 else 0 end) s333,
0 lis
from hhl7.msseormd
)
select sum(s001), sum(s333), sum(lis)
into value_a, value_c, value_d
from temp;
IFs follow, but - that's easier part, once you fetch value_a etc.
[EDIT, based on your comment]
If that's the case, then one "huge" CTE won't help at all. I'd suggest you to split it into several parts, one CTE per target variable. Something like this:
-- values that make VALUE_A: ------------------------
with ss as
(select count(*) cnt from msse where success_status in ('F', 'N')
union all
select count(*) cnt from abcd where xyz = 23
union all
...
)
select sum(cnt)
into value_a
from ss;
-- values that make VALUE_C: ------------------------
with s333 as
(select count(*) cnt from msse where success_status in ('M')
union all
select count(*) cnt from msseormd where success_status = 'A'
union all
select count(*) cnt from qwerty where zzy = 154
union all
...
)
select sum(cnt)
into value_c
from s333;
-- etc., for all VALUE_x variables
As of error you got: you can't have multiple INTO clauses in the same SELECT statement. You could, though, do this:
with (your current CTE goes here)
-- final SELECT:
select (select sum(s001_) from ss),
(select sum(s333_) from s333),
(select sum(lis_) from lis)
into value_a, value_c, value_d
from dual
but I'd say that - if there are dozens of tables involved, one huge CTE really doesn't help at all, but makes things more complex than they should be.

Answer 2

Your query is equivalent to just:
SELECT set_a.S001, set_c.S333_, set_d.LIS_
INTO Value_A, VALUE_C, VALUE_D
FROM (SELECT COUNT(1) AS S001
FROM x.MSSE
WHERE SUCCESS_STATUS IN ('N','F')) set_a
, (SELECT COUNT(1) AS S333_
FROM X.MSSE
WHERE SUCCESS_STATUS IN ('M','A')) set_c
, (SELECT COUNT(1) AS LIS_
FROM A.MSS A
WHERE SUCCESS_STATUS = 'D') set_d;
IF Value_A > 30000 THEN
--DO THIS
END IF;
IF VALUE_C > 30000 THEN
--DO THAT
END IF;
There is 0 need of those unions.
EDIT: If you have different tables you can adopt either of these methods:
/* Preserve unions and use it as subquery*/
SELECT SUM(S333_)
INTO VALUE_C
FROM (SELECT /*+ INDEX (A MSSEADTD_SI02) */
COUNT(ROWNUM) AS S333_
FROM X.MSSE A
WHERE SUCCESS_STATUS = 'M'
UNION ALL
SELECT /*+ INDEX (A MSSEORMD_SI03) */
COUNT(ROWNUM)
FROM HHL7.MSSEORMD A
WHERE SUCCESS_STATUS = 'A')
/* Use scalar subquery */
SELECT (SELECT /*+ INDEX (A MSSEADTD_SI02) */
COUNT(ROWNUM) AS S333_
FROM X.MSSE A
WHERE SUCCESS_STATUS = 'M')
+ (SELECT /*+ INDEX (A MSSEORMD_SI03) */
COUNT(ROWNUM)
FROM HHL7.MSSEORMD A
WHERE SUCCESS_STATUS = 'A')
INTO VALUE_C
FROM dual