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sql server programming : How do I deleting all but the last 3 records entered
SET ROWCOUNT where X is the number of rows you want to delete. If you if have 3 and want to delete 1 SET ROWCOUNT 1 DELETE ........ SET ROWCOUNT
Try using a trigger if you have a date or id field!
[quoted text, click to view] "SamIAm" <samuel@rubbachicken.com> wrote in message news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > Hi > > I have a system where each member can only have 3 records in a table. When a > new row is created for a member, I need to delete the oldest record first so > that there are never more than 3 records for a member. > > How do I do this in TSQL? > > Thank, > > S > >
Do you have some column which specify the sequence of rows inserted or date
when rows were inserted? -- Tibor Karaszi, SQL Server MVP Archive at: http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver [quoted text, click to view] "SamIAm" <samuel@rubbachicken.com> wrote in message news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > Hi > > I have a system where each member can only have 3 records in a table. When a > new row is created for a member, I need to delete the oldest record first so > that there are never more than 3 records for a member. > > How do I do this in TSQL? > > Thank, > > S > >
Then you can do something like below inside your trigger (code not tested
because no DDL): DELETE FROM tblname AS o WHERE NOT EXISTS (SELECT TOP 3 * FROM tblname AS i WHERE o.pk = i.pk ORDER BY DateCreated DESC) Or use an IN instead. -- Tibor Karaszi, SQL Server MVP Archive at: http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver [quoted text, click to view] "SamIAm" <samuel@rubbachicken.com> wrote in message news:ehp0x4R$DHA.1464@tk2msftngp13.phx.gbl... > I have a DateCreated column > > "Tibor Karaszi" <tibor_please.no.email_karaszi@hotmail.nomail.com> wrote in > message news:OZlGPzR$DHA.1796@TK2MSFTNGP12.phx.gbl... > > Do you have some column which specify the sequence of rows inserted or > date > > when rows were inserted? > > > > -- > > Tibor Karaszi, SQL Server MVP > > Archive at: > > > http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver > > > > > > "SamIAm" <samuel@rubbachicken.com> wrote in message > > news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > > > Hi > > > > > > I have a system where each member can only have 3 records in a table. > When > > a > > > new row is created for a member, I need to delete the oldest record > first > > so > > > that there are never more than 3 records for a member. > > > > > > How do I do this in TSQL? > > > > > > Thank, > > > > > > S > > > > > > > > > > > >
delete for this member all records without last 2 records using
SELECT TOP 2 ... in WHERE condition in DELETE and next add this new record ph U¿ytkownik "SamIAm" <samuel@rubbachicken.com> napisa³ w wiadomo¶ci news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... [quoted text, click to view] > Hi > > I have a system where each member can only have 3 records in a table. When a > new row is created for a member, I need to delete the oldest record first so > that there are never more than 3 records for a member. > > How do I do this in TSQL? > > Thank, > > S > >
IF (SELECT COUNT(*) FROM YourTable WHERE MemberId = @intmemberid) >= 3
DELETE FROM YourTable WHERE MemberId = @intmemberid AND DateCreated = SELECT MIN(DateCreated FROM YourTable WHERE MemberId = @intmemberid) INSERT .... -- Roji. P. Thomas SQL Server Programmer [quoted text, click to view] "SamIAm" <samuel@rubbachicken.com> wrote in message news:ehp0x4R$DHA.1464@tk2msftngp13.phx.gbl... > I have a DateCreated column > > "Tibor Karaszi" <tibor_please.no.email_karaszi@hotmail.nomail.com> wrote in > message news:OZlGPzR$DHA.1796@TK2MSFTNGP12.phx.gbl... > > Do you have some column which specify the sequence of rows inserted or > date > > when rows were inserted? > > > > -- > > Tibor Karaszi, SQL Server MVP > > Archive at: > > > http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver > > > > > > "SamIAm" <samuel@rubbachicken.com> wrote in message > > news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > > > Hi > > > > > > I have a system where each member can only have 3 records in a table. > When > > a > > > new row is created for a member, I need to delete the oldest record > first > > so > > > that there are never more than 3 records for a member. > > > > > > How do I do this in TSQL? > > > > > > Thank, > > > > > > S > > > > > > > > > > > >
Tibor,
I believe the query u suggested will not work. The expression EXISTS (SELECT TOP 3 * FROM tblname AS i WHERE o.pk = i.pk ORDER BY DateCreated DESC) Will evaluate to TRUE even if you have only one record. Right? -- Roji. P. Thomas SQL Server Programmer "Tibor Karaszi" <tibor_please.no.email_karaszi@hotmail.nomail.com> wrote in message news:exBzq7R$DHA.3712@tk2msftngp13.phx.gbl... [quoted text, click to view] > Then you can do something like below inside your trigger (code not tested > because no DDL): > > DELETE FROM tblname AS o > WHERE NOT EXISTS > (SELECT TOP 3 * FROM tblname AS i > WHERE o.pk = i.pk > ORDER BY DateCreated DESC) > > Or use an IN instead. > > -- > Tibor Karaszi, SQL Server MVP > Archive at: > http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver > > > "SamIAm" <samuel@rubbachicken.com> wrote in message > news:ehp0x4R$DHA.1464@tk2msftngp13.phx.gbl... > > I have a DateCreated column > > > > "Tibor Karaszi" <tibor_please.no.email_karaszi@hotmail.nomail.com> wrote > in > > message news:OZlGPzR$DHA.1796@TK2MSFTNGP12.phx.gbl... > > > Do you have some column which specify the sequence of rows inserted or > > date > > > when rows were inserted? > > > > > > -- > > > Tibor Karaszi, SQL Server MVP > > > Archive at: > > > > > > http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver > > > > > > > > > "SamIAm" <samuel@rubbachicken.com> wrote in message > > > news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > > > > Hi > > > > > > > > I have a system where each member can only have 3 records in a table. > > When > > > a > > > > new row is created for a member, I need to delete the oldest record > > first > > > so > > > > that there are never more than 3 records for a member. > > > > > > > > How do I do this in TSQL? > > > > > > > > Thank, > > > > > > > > S > > > > > > > > > > > > > > > > > > > >
Hi
I have a system where each member can only have 3 records in a table. When a new row is created for a member, I need to delete the oldest record first so that there are never more than 3 records for a member. How do I do this in TSQL? Thank, S
I have a DateCreated column
"Tibor Karaszi" <tibor_please.no.email_karaszi@hotmail.nomail.com> wrote in message news:OZlGPzR$DHA.1796@TK2MSFTNGP12.phx.gbl... [quoted text, click to view] > Do you have some column which specify the sequence of rows inserted or date > when rows were inserted? > > -- > Tibor Karaszi, SQL Server MVP > Archive at: > http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver > > > "SamIAm" <samuel@rubbachicken.com> wrote in message > news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > > Hi > > > > I have a system where each member can only have 3 records in a table. When > a > > new row is created for a member, I need to delete the oldest record first > so > > that there are never more than 3 records for a member. > > > > How do I do this in TSQL? > > > > Thank, > > > > S > > > > > >
I have a DateCreated column
[quoted text, click to view] "Immy" <imtiaz_ullah@hotmail.com> wrote in message news:uLL6o2R$DHA.3668@TK2MSFTNGP09.phx.gbl... > Try using a trigger if you have a date or id field! > "SamIAm" <samuel@rubbachicken.com> wrote in message > news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > > Hi > > > > I have a system where each member can only have 3 records in a table. When > a > > new row is created for a member, I need to delete the oldest record first > so > > that there are never more than 3 records for a member. > > > > How do I do this in TSQL? > > > > Thank, > > > > S > > > > > >
Thanks
[quoted text, click to view] "Roji. P. Thomas" <lazydragon@nowhere.com> wrote in message news:#$EcQIS$DHA.2808@TK2MSFTNGP10.phx.gbl... > Tibor, > > I believe the query u suggested will not work. > > The expression > EXISTS > (SELECT TOP 3 * FROM tblname AS i > WHERE o.pk = i.pk > ORDER BY DateCreated DESC) > > Will evaluate to TRUE even if you have only one record. > Right? > > > > -- > Roji. P. Thomas > SQL Server Programmer > "Tibor Karaszi" <tibor_please.no.email_karaszi@hotmail.nomail.com> wrote in > message news:exBzq7R$DHA.3712@tk2msftngp13.phx.gbl... > > Then you can do something like below inside your trigger (code not tested > > because no DDL): > > > > DELETE FROM tblname AS o > > WHERE NOT EXISTS > > (SELECT TOP 3 * FROM tblname AS i > > WHERE o.pk = i.pk > > ORDER BY DateCreated DESC) > > > > Or use an IN instead. > > > > -- > > Tibor Karaszi, SQL Server MVP > > Archive at: > > > http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver > > > > > > "SamIAm" <samuel@rubbachicken.com> wrote in message > > news:ehp0x4R$DHA.1464@tk2msftngp13.phx.gbl... > > > I have a DateCreated column > > > > > > "Tibor Karaszi" <tibor_please.no.email_karaszi@hotmail.nomail.com> wrote > > in > > > message news:OZlGPzR$DHA.1796@TK2MSFTNGP12.phx.gbl... > > > > Do you have some column which specify the sequence of rows inserted or > > > date > > > > when rows were inserted? > > > > > > > > -- > > > > Tibor Karaszi, SQL Server MVP > > > > Archive at: > > > > > > > > > > http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver > > > > > > > > > > > > "SamIAm" <samuel@rubbachicken.com> wrote in message > > > > news:eySxXmR$DHA.3188@TK2MSFTNGP09.phx.gbl... > > > > > Hi > > > > > > > > > > I have a system where each member can only have 3 records in a > table. > > > When > > > > a > > > > > new row is created for a member, I need to delete the oldest record > > > first > > > > so > > > > > that there are never more than 3 records for a member. > > > > > > > > > > How do I do this in TSQL? > > > > > > > > > > Thank, > > > > > > > > > > S > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
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