Select help with sql
Hellocould you please help write select sql to retrieve the maximum number of concurrent users, something to check?
user_id, rec_start, rec_end
1, 01.10.2009 12:01, 01.10.2009 13:11
2, 01.10.2009 13:12, 01.10.2009 14:04
3, 01.10.2009 13:35, 01.10.2009 13:55
1, 01.10.2009 14:35, 01.10.2009 14:50
1, 01.10.2009 14:45, 01.10.2009 14:50
I would like:
hour, max_of_conc_users
01.10.2009 12: 1 - no more then 1 user at the same time
01.10.2009 13: 2 - user_id 2and 3 record at the same time
01.10.2009 14: 2 - user_id 1 to 2 sessions
Thank you
D.
Hello
Interesting problem!
We will change a bit, your sample data for the (total connections per hour) much simpler problem solved by Sven and Hoek has not coincidentally the same results as your problem (the high concurrent users per hour).
I changed the data of Hoek, adding a line, which has been lgged in for the entire period covered by others:
CREATE TABLE t as
select 9 user_id, to_date('01.10.2009 12:01', 'dd.mm.yyyy hh24:mi') rec_start, to_date('01.10.2009 14:49', 'dd.mm.yyyy hh24:mi') rec_end from dual union all
select 1 user_id, to_date('01.10.2009 12:01', 'dd.mm.yyyy hh24:mi') rec_start, to_date('01.10.2009 13:11', 'dd.mm.yyyy hh24:mi') rec_end from dual union all
select 2, to_date('01.10.2009 13:12', 'dd.mm.yyyy hh24:mi'), to_date('01.10.2009 14:04', 'dd.mm.yyyy hh24:mi') from dual union all
select 3, to_date('01.10.2009 13:35', 'dd.mm.yyyy hh24:mi'), to_date('01.10.2009 13:55', 'dd.mm.yyyy hh24:mi') from dual union all
select 1, to_date('01.10.2009 14:35', 'dd.mm.yyyy hh24:mi'), to_date('01.10.2009 14:50', 'dd.mm.yyyy hh24:mi') from dual union all
select 1, to_date('01.10.2009 14:45', 'dd.mm.yyyy hh24:mi'), to_date('01.10.2009 14:50', 'dd.mm.yyyy hh24:mi') from dual
;
The query below unpivots these data in separate lines for rec_start and rec_end. We use the analytical SUM function to count each + 1 rec_start and each rec_end as -1 to get the number of concurrent users at any time. As soon as we have these data, we can use GROUP BY TRUNC (dt, 'HH')as Sven Hoek has suggested, to get the maximum by houir:
WITH cntr AS
(
SELECT 1 AS cnt FROM dual UNION ALL
SELECT -1 AS cnt FROM dual
)
, events AS
(
SELECT CASE cntr.cnt
WHEN 1 THEN t.rec_start
WHEN -1 THEN t.rec_end
END AS dt
, cntr.cnt
FROM t
CROSS JOIN cntr
)
, concurrent_users AS
(
SELECT TRUNC (dt, 'HH') AS hour
, SUM (cnt) OVER (ORDER BY dt) AS concurrent_users
FROM events
)
SELECT hour
, MAX (concurrent_users) AS max_of_conc_users
FROM concurrent_users
GROUP BY hour
ORDER BY hour;
Output:
HOUR MAX_OF_CONC_USERS
---------------- -----------------
01.10.2009 12:00 2
01.10.2009 13:00 3
01.10.2009 14:00 3
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of rcv_transactions
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inner join
c rcv_shipment_headers
On a.shipment_header_id = c.shipment_header_id
left outer join
po_releases_all d
On a.po_release_id = d.po_release_id
A.po_line_id group,
a.po_header_id,
c.receipt_num
) rcv2
On rcv1.po_line_id = rcv2.po_line_id
and rcv1.receipt_num = rcv2.receipt_num
where rcv1.transact_qty! = nvl(rcv2.transact_qty,999999999)
Concerning
Etbin
-
with t as
(select *)
Of
(select *)
Of
(select rownum rn
of the double
connect by rownum < 100) a
where mod(a.rn,9) <>0) b
where mod(b.rn,6) <>0).
r as (select t.rn
t)
Select r.*
r
My version of oracle is: 10 G/9i
Hi all
I have the above query, now I have a scenario where I have to fill in the missing (between the smallest and largest number) numbers.
Example:
In the series of 10 consecutive numbers (with 1 interval between 2 numbers).
1
2
3
4
5
9
10
I need produce the following output:
1
2
3
4
5
6
7
8
9
10
Please help me with the sql.
Respect of
RahulHII Mac Freak Rahul,
Here's a solution:
SQL> select * from t1; COL1 ---------- 1 10 SQL> with a as (select level lev 2 from t1 3 connect by level <= (select max(col1) from t1)) 4 select a.lev 5 from a 6 minus 7 select col1 8 from t1 ; LEV ---------- 2 3 4 5 6 7 8 9 8 rows selected. SQL> -
Help with SQL query definition
Hello
Could someone please help me with the sub condition.
On the example of the EMP table, I want a report that looks like:
Please see the application for the relevant columns and the definitions of the watch below:Manager Tot_Joiniees_Q1 Tot_Joiniees_Q2 Tot_Joiniees_Q3 Tot_Joiniees_Q4
Thank youSELECT mgr, CASE WHEN TO_CHAR (hiredate, 'MON') IN ('JUN', 'JUL', 'AUG') THEN 'Q1' WHEN TO_CHAR (hiredate, 'MON') IN ('SEP', 'OCT', 'NOV') THEN 'Q2' WHEN TO_CHAR (hiredate, 'MON') IN ('DEC', 'JAN', 'FEB') THEN 'Q3' WHEN TO_CHAR (hiredate, 'MON') IN ('MAR', 'APR', 'MAY') THEN 'Q4' END qtd, COUNT (DISTINCT ename) FROM emp GROUP BY mgr, CASE WHEN TO_CHAR (hiredate, 'MON') IN ('JUN', 'JUL', 'AUG') THEN 'Q1' WHEN TO_CHAR (hiredate, 'MON') IN ('SEP', 'OCT', 'NOV') THEN 'Q2' WHEN TO_CHAR (hiredate, 'MON') IN ('DEC', 'JAN', 'FEB') THEN 'Q3' WHEN TO_CHAR (hiredate, 'MON') IN ('MAR', 'APR', 'MAY') THEN 'Q4' END ORDER BY 1, 2
CJMSELECT mgr Manager, COUNT(CASE WHEN TO_CHAR(hiredate,'Q') = '1' then 1 end) Tot_Joiniees_Q1, COUNT(CASE WHEN TO_CHAR(hiredate,'Q') = '2' then 1 end) Tot_Joiniees_Q2, COUNT(CASE WHEN TO_CHAR(hiredate,'Q') = '3' then 1 end) Tot_Joiniees_Q3, COUNT(CASE WHEN TO_CHAR(hiredate,'Q') = '4' then 1 end) Tot_Joiniees_Q4 FROM emp GROUP BY mgr, TO_CHAR(hiredate,'Q') / MANAGER TOT_JOINIEES_Q1 TOT_JOINIEES_Q2 TOT_JOINIEES_Q3 TOT_JOINIEES_Q4 ---------- --------------- --------------- --------------- --------------- 7566 0 0 0 1 7839 0 3 0 0 7698 0 0 2 0 7788 0 1 0 0 7782 1 0 0 0 7566 0 1 0 0 7902 0 0 0 1 7698 2 0 0 0 0 0 0 1 7698 0 0 0 1 10 rows selected. SQL>SY.
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Need help with SQL Query - change of name history of audit table.
I need your help to find the result in the following way...
Emp No New_name Old_Name ----------------------------------------------- 1 Name3 Name2 1 Name2 Name1
Thank you...create table emp(emp_id number(10), emp_name varchar(50), constraints emp_pk primary key(emp_id) ); create table emp_audit( audit_id number(10), emp_id number(10), emp_name varchar(50), audit_date date, constraints emp_audit_pk primary key (audit_id), constraints emp_audit_emp_fk foreign key(emp_id) references emp(emp_id)); insert into emp values(1,'Name3'); insert into EMP_AUDIT (audit_id, emp_id, emp_name, audit_date) values (1, 1, 'Name1', to_date('14-08-2011', 'dd-mm-yyyy')); insert into EMP_AUDIT (audit_id, emp_id, emp_name, audit_date) values (2, 1, 'Name2', to_date('15-08-2011', 'dd-mm-yyyy')); commit;Dipabkar Bédard (DB) wrote:
We write is the query without using "partition by" in oracle...?
with t as ( select audit_id, emp_id, emp_name, row_number() over(order by audit_id) rn from emp_audit order by emp_id, audit_id ) select a.audit_id, a.emp_id, a.emp_name old_name, nvl(b.emp_name,(select c.emp_name from emp c where c.emp_id = a.emp_id)) new_name from t a left join t b on ( b.emp_id = a.emp_id and b.rn = a.rn + 1 ) / AUDIT_ID EMP_ID OLD_NAME NEW_NAME ---------- ---------- -------------------------------------------------- ------------ 1 1 Name1 Name2 2 1 Name2 Name3 SQL>And without analytical functions:
with t1 as ( select audit_id, emp_id, emp_name from emp_audit order by emp_id, audit_id ), t2 as ( select audit_id, emp_id, emp_name, rownum rn from t1 ) select a.audit_id, a.emp_id, a.emp_name old_name, nvl(b.emp_name,(select c.emp_name from emp c where c.emp_id = a.emp_id)) new_name from t2 a left join t2 b on ( b.emp_id = a.emp_id and b.rn = a.rn + 1 ) / AUDIT_ID EMP_ID OLD_NAME NEW_NAME ---------- ---------- -------------------------------------------------- ---------- 1 1 Name1 Name2 2 1 Name2 Name3 SQL>SY.
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Need help with sql query involving distinct and County
I have 2 tables and I want to get the number of specific names. Find the details below. It's hard to explain but I will try to provide as much detail as I can.
Table A:
ID of the SR
1001 1
1002 2
2 1003
1004 3
Table B:
Name of the key SrNew
1 David 1001
2 James 1002
3 James 1002
4 James 1003
5 James 1004
6 Mike 1004
Result: I'm looking:
Count names such as if the name appears for the same ID of Table A two times, and then only count 1.
Name of County
David 1
James 2 (1002 and 1003 for the same ID (ID #2) so count as 1 for this and then 1 more for 1004 and ID 3)
1 Mike
I have following question:
SELECT distinct (b.Name), a.ID
FROM TableA, TableB b
Where a.Sr = b.SrNew Group By b.Name, a.ID
and as a result I get:
ID name
David 1
James 2
3 James
3 Mike
Now, I want to just the number of each name with the result, but don't know how I can do this with a sql?
Thanks in advance.Who help me?
SELECT b.Name, count(distinct a.ID) FROM TableA a, TableB b Where a.Sr = b.SrNew Group By b.NameNicolas.
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