Oracle randomly shuffling entire rows - sql

Question

have a locations table that contains 3 types of records (see below). I only need to SELECT record_type = 'G' rows.
I want to wrap the data in a loop ( ie 5 times) but how can I randomly shuffle the ENTIRE rows, by location_id, so they appear in a different order with each iteration of the loop? Perhaps, sticking the rows into an array and shuffling the array?
Note, I don't want to shuffle the columns, I want the row kept in tact. In the future more locations maybe added.
CREATE TABLE locations AS
SELECT level AS location_id,
'Door ' || level AS location_name,
CASE round(dbms_random.value(1,3))
WHEN 1 THEN 'A'
WHEN 2 THEN 'T'
WHEN 3 THEN 'G'
END AS location_type
FROM dual
CONNECT BY level <= 25;
SELECT * from tour_detail
Order by tour_id, tour_time
TOUR_ID TOUR_TIME LOCATION_ID
1 06212020 00:10:25 2
1 06212020 00:21:05 18
1 06212020 00:30:33 11
1 06212020 00:40:51 17
1 06212020 00:52:13 4
1 06212020 01:01:42 2
1 06212020 01:07:52 11
We have an access control system when you slide your card it records card_num, location_id, access_date in MMDDYYY HH24:MI:SS format.
Some wanted to create a guard tour system. That compares the access_date to the tour_detail detail date. If within a certain criteria say + or - 2 minutes that means the guard was on time, if GT or LT 2 minutes we log an early or late, if GT Or LT 5 minutes or no access_history record we log a no show.
I was asked to throw together some testing data. As you can see the tour_detail records contain MMDDYYYY HH24:MI:SS so I'm thinking about changing the tour_detail records to interval hour to minute but I have little experience working with that.

Answer 1

so they appear in a different order with each iteration of the loop
This is pointless. You are inserting rows into a table. Rows (in a RDBMS table) aren't stored in any particular order.
But, you can sort them when selecting from that table and - in order to do that - you have to use the order by clause.
As of selecting, see if this helps:
SQL> with data as
2 (select empno, ename, job, sal
3 from emp
4 where deptno = 20
5 order by round(dbms_random.value(0, 15))
6 )
7 select column_value, d.*
8 from data d cross join table(cast(multiset(select level from dual
9 connect by level <= 5
10 ) as sys.odcinumberlist));
COLUMN_VALUE EMPNO ENAME JOB SAL
------------ ---------- ---------- --------- ----------
4 7902 FORD ANALYST 3000
4 7788 SCOTT ANALYST 3000
2 7369 SMITH CLERK 1000
4 7369 SMITH CLERK 1000
1 7369 SMITH CLERK 1000
5 7566 JONES MANAGER 2975
1 7876 ADAMS CLERK 1100
1 7788 SCOTT ANALYST 3000
5 7788 SCOTT ANALYST 3000
3 7876 ADAMS CLERK 1100
1 7902 FORD ANALYST 3000
2 7876 ADAMS CLERK 1100
5 7902 FORD ANALYST 3000
3 7902 FORD ANALYST 3000
3 7566 JONES MANAGER 2975
1 7566 JONES MANAGER 2975
3 7788 SCOTT ANALYST 3000
2 7902 FORD ANALYST 3000
4 7566 JONES MANAGER 2975
5 7876 ADAMS CLERK 1100
2 7788 SCOTT ANALYST 3000
3 7369 SMITH CLERK 1000
4 7876 ADAMS CLERK 1100
2 7566 JONES MANAGER 2975
5 7369 SMITH CLERK 1000
25 rows selected.
SQL>

Answer 2

Let's say you have a table with 5 IDs
create table tab as
select rownum id from dual connect by level <= 5;
THis produce a random order output of the rows
select * from tab order by dbms_random.value;
ID
----------
2
4
5
1
3
If you repeat the statment you get a different (random) result
ID
----------
5
4
2
1
3
So simple repaet the query in the loop or make something like this
with data as (
select 1 pass_id, id from tab
union all
select 2 pass_id, id from tab
union all
select 3 pass_id, id from tab )
select * from data
order by 1,dbms_random.value