find missing/deleted records?

I have 2 tables say table1 and table2 with the same structure. Each record
is identified by a field 'SerialNo'. Now there should be a total of 500000
records in both tables with serialno from 1 to 500000. Either a record is in
table1 or table2. I want to find records (or SerialNo's) that are in
neither table (if deleted by accident etc). What would be the sql query?
I'm using SQL 6.5
thx
One way I can think of is,
populate a number table with entries 1 to 50000
and query
SELECT SlNo FROM tblNumbers WHERE
SlNo NOT IN(SELECT SlNo FROM table1 UNION
SELECT SlNo FROM Table2)
Roji. P. Thomas
SQL Server Programmer
"Mansoor Azam" <mansoorb@.shoa.net> wrote in message
news:2h5n48F8ei13U1@.uni-berlin.de...
> I have 2 tables say table1 and table2 with the same structure. Each record
> is identified by a field 'SerialNo'. Now there should be a total of 500000
> records in both tables with serialno from 1 to 500000. Either a record is
in
> table1 or table2. I want to find records (or SerialNo's) that are in
> neither table (if deleted by accident etc). What would be the sql query?
> I'm using SQL 6.5
> thx
>
|||Mansoor,
Normalisation and DRI would suggest that you NOT have 2 tables.
e.g. How do you enforce a "no duplication" constraint easily ?
That said UNION and OUTER JOIN are useful in this case. eg:
create table One
(
SerialNo int
)
create table Two
(
SerialNo int
)
insert One values ( 1 )
insert One values ( 3 )
insert One values ( 4 )
insert One values ( 8 )
insert One values ( 16 )
insert Two values ( 2 )
insert Two values ( 7 )
insert Two values ( 14 )
insert Two values ( 15 )
insert Two values ( 18 )
Select a.SerialNo
from
( Select SerialNo
from One
Union
Select SerialNo
from Two
) a
left outer join
( Select SerialNo
from One
Union
Select SerialNo
from Two
) b
on b.SerialNo = a.SerialNo + 1
where b.SerialNo is NULL
Will return only 1 row, unless you have gaps
Regards
AJ
"Mansoor Azam" <mansoorb@.shoa.net> wrote in message news:2h5n48F8ei13U1@.uni-berlin.de...
> I have 2 tables say table1 and table2 with the same structure. Each record
> is identified by a field 'SerialNo'. Now there should be a total of 500000
> records in both tables with serialno from 1 to 500000. Either a record is in
> table1 or table2. I want to find records (or SerialNo's) that are in
> neither table (if deleted by accident etc). What would be the sql query?
> I'm using SQL 6.5
> thx
>
|||Create a numbers table first, if you don't already have a table that
contains every number:
http://www.bizdatasolutions.com/tsql/tblnumbers.asp
SELECT N.number
FROM Numbers AS N
LEFT JOIN Table1 AS T1
ON N.number = T1.serialno
LEFT JOIN Table2 AS T2
ON N.number = T2.serialno
WHERE T1.serialno IS NULL
AND T2.serialno IS NULL
AND N.number BETWEEN 1 AND 50000
David Portas
SQL Server MVP

find missing/deleted records?

I have 2 tables say table1 and table2 with the same structure. Each record
is identified by a field 'SerialNo'. Now there should be a total of 500000
records in both tables with serialno from 1 to 500000. Either a record is in
table1 or table2. I want to find records (or SerialNo's) that are in
neither table (if deleted by accident etc). What would be the sql query?
I'm using SQL 6.5
thxOne way I can think of is,
populate a number table with entries 1 to 50000
and query
SELECT SlNo FROM tblNumbers WHERE
SlNo NOT IN(SELECT SlNo FROM table1 UNION
SELECT SlNo FROM Table2)
--
Roji. P. Thomas
SQL Server Programmer
"Mansoor Azam" <mansoorb@.shoa.net> wrote in message
news:2h5n48F8ei13U1@.uni-berlin.de...
> I have 2 tables say table1 and table2 with the same structure. Each record
> is identified by a field 'SerialNo'. Now there should be a total of 500000
> records in both tables with serialno from 1 to 500000. Either a record is
in
> table1 or table2. I want to find records (or SerialNo's) that are in
> neither table (if deleted by accident etc). What would be the sql query?
> I'm using SQL 6.5
> thx
>|||Mansoor,
Normalisation and DRI would suggest that you NOT have 2 tables.
e.g. How do you enforce a "no duplication" constraint easily ?
That said UNION and OUTER JOIN are useful in this case. eg:
create table One
(
SerialNo int
)
create table Two
(
SerialNo int
)
insert One values ( 1 )
insert One values ( 3 )
insert One values ( 4 )
insert One values ( 8 )
insert One values ( 16 )
insert Two values ( 2 )
insert Two values ( 7 )
insert Two values ( 14 )
insert Two values ( 15 )
insert Two values ( 18 )
Select a.SerialNo
from
( Select SerialNo
from One
Union
Select SerialNo
from Two
) a
left outer join
( Select SerialNo
from One
Union
Select SerialNo
from Two
) b
on b.SerialNo = a.SerialNo + 1
where b.SerialNo is NULL
Will return only 1 row, unless you have gaps
Regards
AJ
"Mansoor Azam" <mansoorb@.shoa.net> wrote in message news:2h5n48F8ei13U1@.uni-berlin.de...
> I have 2 tables say table1 and table2 with the same structure. Each record
> is identified by a field 'SerialNo'. Now there should be a total of 500000
> records in both tables with serialno from 1 to 500000. Either a record is in
> table1 or table2. I want to find records (or SerialNo's) that are in
> neither table (if deleted by accident etc). What would be the sql query?
> I'm using SQL 6.5
> thx
>|||Create a numbers table first, if you don't already have a table that
contains every number:
http://www.bizdatasolutions.com/tsql/tblnumbers.asp
SELECT N.number
FROM Numbers AS N
LEFT JOIN Table1 AS T1
ON N.number = T1.serialno
LEFT JOIN Table2 AS T2
ON N.number = T2.serialno
WHERE T1.serialno IS NULL
AND T2.serialno IS NULL
AND N.number BETWEEN 1 AND 50000
--
David Portas
SQL Server MVP
--

find missing/deleted records?

I have 2 tables say table1 and table2 with the same structure. Each record
is identified by a field 'SerialNo'. Now there should be a total of 500000
records in both tables with serialno from 1 to 500000. Either a record is in
table1 or table2. I want to find records (or SerialNo's) that are in
neither table (if deleted by accident etc). What would be the sql query?
I'm using SQL 6.5

thxMansoor,

Normalisation and DRI would suggest that you NOT have 2 tables.
e.g. How do you enforce a "no duplication" constraint easily ?

That said UNION and OUTER JOIN are useful in this case. eg:

create table One
(
SerialNo int
)
create table Two
(
SerialNo int
)

insert One values ( 1 )
insert One values ( 3 )
insert One values ( 4 )
insert One values ( 8 )
insert One values ( 16 )
insert Two values ( 2 )
insert Two values ( 7 )
insert Two values ( 14 )
insert Two values ( 15 )
insert Two values ( 18 )

Select a.SerialNo
from
( Select SerialNo
from One
Union
Select SerialNo
from Two
) a
left outer join
( Select SerialNo
from One
Union
Select SerialNo
from Two
) b
on b.SerialNo = a.SerialNo + 1
where b.SerialNo is NULL

Will return only 1 row, unless you have gaps

Regards
AJ

"Mansoor Azam" <mansoorb@.shoa.net> wrote in message news:2h5n48F8ei13U1@.uni-berlin.de...
> I have 2 tables say table1 and table2 with the same structure. Each record
> is identified by a field 'SerialNo'. Now there should be a total of 500000
> records in both tables with serialno from 1 to 500000. Either a record is in
> table1 or table2. I want to find records (or SerialNo's) that are in
> neither table (if deleted by accident etc). What would be the sql query?
> I'm using SQL 6.5
> thx|||Create a numbers table first, if you don't already have a table that
contains every number:
http://www.bizdatasolutions.com/tsql/tblnumbers.asp

SELECT N.number
FROM Numbers AS N
LEFT JOIN Table1 AS T1
ON N.number = T1.serialno
LEFT JOIN Table2 AS T2
ON N.number = T2.serialno
WHERE T1.serialno IS NULL
AND T2.serialno IS NULL
AND N.number BETWEEN 1 AND 50000

--
David Portas
SQL Server MVP
--

find missing/deleted records?

I have 2 tables say table1 and table2 with the same structure. Each record
is identified by a field 'SerialNo'. Now there should be a total of 500000
records in both tables with serialno from 1 to 500000. Either a record is in
table1 or table2. I want to find records (or SerialNo's) that are in
neither table (if deleted by accident etc). What would be the sql query?
I'm using SQL 6.5
thxOne way I can think of is,
populate a number table with entries 1 to 50000
and query
SELECT SlNo FROM tblNumbers WHERE
SlNo NOT IN(SELECT SlNo FROM table1 UNION
SELECT SlNo FROM Table2)
Roji. P. Thomas
SQL Server Programmer
"Mansoor Azam" <mansoorb@.shoa.net> wrote in message
news:2h5n48F8ei13U1@.uni-berlin.de...
> I have 2 tables say table1 and table2 with the same structure. Each record
> is identified by a field 'SerialNo'. Now there should be a total of 500000
> records in both tables with serialno from 1 to 500000. Either a record is
in
> table1 or table2. I want to find records (or SerialNo's) that are in
> neither table (if deleted by accident etc). What would be the sql query?
> I'm using SQL 6.5
> thx
>|||Mansoor,
Normalisation and DRI would suggest that you NOT have 2 tables.
e.g. How do you enforce a "no duplication" constraint easily ?
That said UNION and OUTER JOIN are useful in this case. eg:
create table One
(
SerialNo int
)
create table Two
(
SerialNo int
)
insert One values ( 1 )
insert One values ( 3 )
insert One values ( 4 )
insert One values ( 8 )
insert One values ( 16 )
insert Two values ( 2 )
insert Two values ( 7 )
insert Two values ( 14 )
insert Two values ( 15 )
insert Two values ( 18 )
Select a.SerialNo
from
( Select SerialNo
from One
Union
Select SerialNo
from Two
) a
left outer join
( Select SerialNo
from One
Union
Select SerialNo
from Two
) b
on b.SerialNo = a.SerialNo + 1
where b.SerialNo is NULL
Will return only 1 row, unless you have gaps
Regards
AJ
"Mansoor Azam" <mansoorb@.shoa.net> wrote in message news:2h5n48F8ei13U1@.uni-berlin.de...[vbc
ol=seagreen]
> I have 2 tables say table1 and table2 with the same structure. Each record
> is identified by a field 'SerialNo'. Now there should be a total of 500000
> records in both tables with serialno from 1 to 500000. Either a record is
in
> table1 or table2. I want to find records (or SerialNo's) that are in
> neither table (if deleted by accident etc). What would be the sql query?
> I'm using SQL 6.5
> thx
>[/vbcol]|||Create a numbers table first, if you don't already have a table that
contains every number:
http://www.bizdatasolutions.com/tsql/tblnumbers.asp
SELECT N.number
FROM Numbers AS N
LEFT JOIN Table1 AS T1
ON N.number = T1.serialno
LEFT JOIN Table2 AS T2
ON N.number = T2.serialno
WHERE T1.serialno IS NULL
AND T2.serialno IS NULL
AND N.number BETWEEN 1 AND 50000
David Portas
SQL Server MVP
--

Filtering results

Hi,
This is a really complicated issue and is hard to explain but i have the following:

select name, MAX(table2.time) from table1 INNER JOIN table2 on table1.id = table2.id GROUP BY name

which is fine and brings up the correct results but if I want to find out from those records what another field is in table 2 for each record it pulls up too many results (i want just the one result from table 2 and then find what user it is)

if I do..

select name, table2.username MAX(table2.time) from table1 INNER JOIN table2 on table1.id = table2.id GROUP BY name, table2.username

.. it pulls up too many results cos there are different usernames

if i dont group by table2.username then it give an errorIt is not clear what do you want - what about this? May be it will help you describe your problem.

select name, max(table2.username),MAX(table2.time) from table1 INNER JOIN table2 on table1.id = table2.id GROUP BY name|||ok say i have these tables

table 1
ID Name
1 ws1
2 ws2
3 ws3
4 ws4

table 2
ID User Time
2 Bill 22/2/04 15:30
2 Bob 22/2/04 16:40
2 Bill 22/2/04 19:50
2 Jack 22/2/04 13:21
2 Jack 22/2/04 11:22
2 Jack 22/2/04 13:10
3 Jack 22/2/04 19:21
...
Inner join table 2 on table1.id = table2.id

i want to get all the records from table 1 and for each of those records i want to get the maximum Time from table 2. That i can do but I cannot extract the user name for each record because if i include the user colum in the select statement it will pul up a value for each user who was on the one machine.

Sorry i cannot explain it well|||Originally posted by steve1981
ok say i have these tables

table 1
ID Name
1 ws1
2 ws2
3 ws3
4 ws4

table 2
ID User Time
2 Bill 22/2/04 15:30
2 Bob 22/2/04 16:40
2 Bill 22/2/04 19:50
2 Jack 22/2/04 13:21
2 Jack 22/2/04 11:22
2 Jack 22/2/04 13:10
3 Jack 22/2/04 19:21
...
Inner join table 2 on table1.id = table2.id

i want to get all the records from table 1 and for each of those records i want to get the maximum Time from table 2. That i can do but I cannot extract the user name for each record because if i include the user colum in the select statement it will pul up a value for each user who was on the one machine.

Sorry i cannot explain it well

Let say for row with id=2 (table 1) you have four users - which one do you want to see in results?|||i want to get all id = 2 and the max login time of those so it would be

2 Bill 22/2/04 19:50

and i want to pull out the username which in this case would be bill|||create table #table1(id int,namen varchar(10))
create table #table2(id int,usern varchar(10),timen datetime)
go
insert #table1 values(1,'ws1')
insert #table1 values(2,'ws2')
insert #table1 values(3,'ws3')
insert #table1 values(4,'ws4')

insert #table2 values(2,'bill','2004-04-20 15:30:00.000')
insert #table2 values(2,'bob','2004-04-20 16:40:00.000')
insert #table2 values(2,'bill','2004-04-20 19:50:00.000')
insert #table2 values(2,'Jack','2004-04-20 13:21:00.000')
insert #table2 values(2,'Jack','2004-04-20 11:22:00.000')
insert #table2 values(2,'Jack','2004-04-20 13:10:00.000')
insert #table2 values(3,'Jack','2004-04-20 19:21:00.000')

select q.id,q.mt,(select top 1 usern from #table2 where id=q.id and timen=q.mt)
from
(select t1.id,max(timen) mt
from #table1 t1
join #table2 t2 on t2.id=t1.id
group by t1.id) as q