According to what I see in BOL, the following should work:
delete
from dbo.tbl1 WITH (INDEX(idx_un01))
where tbl1_no = 1
Yet when I syntax check this I get:
Msg 1069, Level 15, State 1, Line 2
Index hints are only allowed in a FROM clause.
(Please ignore the fact that index hints are unnecessary / a bad idea / etc.)
Can someone give me the right syntax for using an index hint in a delete statement as below?
DELETE table1 WITH (INDEX('indexname_IX'))
WHERE datecolumn < @datevariable
I get this error message:
Incorrect syntax near the keyword 'index'.
I'm using Query Analyzer in SQL 2000 Enterprise.
Thanks,
Gerald
Hello!
I would like when I compare query plans to be able to compare
2 queries where the 1. is the "normal" version and the 2. the version where I forced compiler
not to use a specific index (i don't want to force at table scan, so hint index(0) can't be used).
The only way I see how I could achieve something similar is to to drop the index and compare response time
before and after. But building index could be time consuming...
Is it possible?
select col42 from tbl;
select col42 from tbl with...
pressing CTRL+L
Greetings
Bjørn
Hi All,
I 'm working to improve some sql performance.
One of the major syntax inside the SELECT statment is ..
WHERE FIELDA IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='A') AND
WHERE FIELDB IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='B') AND
WHERE FIELDC IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='C') AND
WHERE FIELDD IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='D') AND
WHERE FIELDE IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='E') AND
WHERE FIELDF IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='F')
(It's to compare the field content with some user input parameter inside a parameter table... )
I think properly is that the SELECT ... IN is causing much slowness in the sql statement. I have indexed FIELDA , FIELDB, FILEDC etc and those PARAVALUE and PARATYPE in the PARATABLE table. But perfromance is still slow and execution takes >20 seconds for 200000 rows of records.
Do any one know if still any chance to improvide the performance like this?
Much Thanks,
Andy
I am trying to write one sql statement that deletes from two tables. Is it possible ? If yes, any thoughts ?
View 5 Replies View RelatedI have 3 tables, with this relation:
tblChats.WebsiteID = tblWebsite.ID
tblWebsite.AccountID = tblAccount.ID
I need to delete rows within tblChats where tblChats.StartTime - GETDATE() < 180 and where they are apart of @AccountID. I have this select statement that works fine, but I am having trouble converting it to a delete statement:
SELECT * FROM tblChats c
LEFT JOIN tblWebsites sites ON sites.ID = c.WebsiteID
LEFT JOIN tblAccounts accounts on accounts.ID = sites.AccountID
WHERE accounts.ID = 16 AND GETDATE() - c.StartTime > 180
What is the efficient way to delete all the tables' index in one database?
Thanks.
Yu
So I've had the need in the past few days to drop unused indexes from our database. I've done some research and found many people using the sys.dm_db_index_usage_stats view to determine which indexes are not used. The problem I'm facing is that different queries I've found return different results. The approaches I've seen determine an index is unused based on the following criteria:
1. The index is not found at all in the sys.dm_db_index_usage_stats view
2. Some or all of the following columns return 0 - user_seeks, user_scans, user_lookups, user_updates, system_seeks, system_scans, system_lookups
My question is what approach is correct? My gut says an index is not being used if the user_seeks, user_scans, and user_lookups are 0. However, some approaches look at user_updates and also the system columns as well. If the user_updates is > 0, doesn't that just mean records are being inserted or updated in the table? That wouldn't indicate the index is being used for searches. Can someone shed some light on this?
Thanks,
Jason
I want to know more details about the Clustered Index Delete. Is that Clustered Index Delete in the execution plan is good or bad or we can neglect that cost. Is there any way to avoid that clustered Index delete operator from the execution plan.
View 4 Replies View RelatedI am new to mssql server. There is a table on one of my databases that occupies a lot of space. And the space usage is as follows: (all values in KB)
reserved: 42329064
data: 16272288
index: 26050032
unused: 6744
This table takes up almost 80% of my database size, and the information is this table just captures the time spent by a user on the website(not very critical data)
I would like to know how to delete the entire index (which is what is occupying most space) to free up disk space. the index is a clustered index.
Hi,I would like to delete a record from a table on the condition that a corresponding ID is located in another table, ie. deleting an email message if the user ID is listed as a recipient in a recipient table etc. Here is my SQL statement: DELETE FROM id_email_message WHERE (id_message IN (SELECT id_message FROM recipients
WHERE id_user = 324) AND message.id_message_status = 2) OR (id_message IN
(SELECT id_message FROM message WHERE id_owner = 324 and id_message_status = 2)) The problem is the multiple select statements paired with the delete statement is too much overhead for the server and I always get a timeout server error (at least that's what I'm guessing, the error page and tracing isn't much helpful). Is there a more efficient way to do this?Thanks.Eitan
Hello there... I'm creating a ASP.net Web Application and storing all my data in SQL database.I'm trying to create a Stored Procedure to Delete info from a table:- I have 3 tables: A, B and C: A's primary key is aID and has no foreign key B's primary key is bID and has 1 foreign key: aID (linking this table to table A); C's primary key is cID and has 1 foreign key: bID (linking this table to table B);- As you can see, all 3 tables are linked (A to B and B to C)I want to be able to DELETE all info from C only by giving aID, is this possible in SQL? I can retrieve the info easily through a SELECT statement and using an INNER JOIN (*). I also know how to do solve this by coding it in C# but I'd have to create some unnecessary variables and more than 1 Stored Procedure when it's probably possible to do all in one!* SELECT cID FROM C INNER JOIN B ON B.bID = C.bIDWHERE A.aID= whateverIf anyone knows the solution to my problem, please don't hesitate :p Thanks,SuperJB
View 2 Replies View Relatedhi, i want to delete some records from my table if there is more then 150 records (it should always be max 150records, it can be less and then it shouldent delete anything),
so when it goes over to 151 records i want to delete the oldest record, so i get the new record + 149 old records, is there a simple way to do this?
When does the DELETE statement physically deletes the records? For example, if I execute the DELETE statement and in the middle of the execution I understand that it is wrong. What will happen if I stop it? Will it delete the records partially? I think the deletion happens when the full statement is done but need an expert answer. Thank you.
View 7 Replies View RelatedHi what do i need to add to this stmt to delete the result ?
---------------
select ct_cust1_text01,ct_address,ct_cust1_text09,count(*)from TABLE_NAME group by ct_cust1_text01,ct_address,ct_cust1_text09 having count(*) > 1
---------
i have tried delete * from TABLE_NAME where (select...)
not great at SQL appreciate any help...
Clearly, a non clustered index can improve the performance of a SELECT statement. Is the same true with an INSERT statement? My contention is that the use of a non clustered index will hurt the performace of an insert statement.
Ideas??
I am new to SQL, especially use SQL in VC++ 6.0 framework.
I am told that creating INDEX on field(s) could speed up a query.
if I create a INDEX like the following
<code>
CREATE nonclustered INDEX IX_XYZ on TableA.field1
</code>
Should I use the INDEX name IX_XYZ in some way in the following SELECT statement. Or the following SELECT statement will be carried out automatically based on the INDEX IX_XYZ.
<code>
SELECT * FROM TableA WHERE field1 = xxx
</code>
Hello
I am trying to delete a row from one table and I expected it to also be removed from the subsequent child tables, linked via foreign and primary keys.
However, when I tried to delete a row in the first table I saw this error:
DELETE FROM [dbo].[Names_DB]WHERE [LName_Name]=N'andrews'
Error: Query(1/1) DELETE statement conflicted with COLUMN REFERENCE constraint 'FK_LName_Name'. The conflict occurred in database 'MainDB', table 'Category_A', column 'LName_Name'.
I went to the very last table in the sequence and I was able to delete the row without problems, but it did not effect any of the other tables.
Please advise.
I need to make many changes in these tables, should I use a trigger instead, if so what is the code to trigger each table? I am new to triggers.
Thanks
Regards
Lynn
Hi! I am deleting some records from the database and at the same time inserting them into a new table. I am doing all this with sql querries. How can that be done with triggers. Basically on the delete, i'd like to insert the affected records. Thanks!
James
Hey guys...
I am trying to tidy up my code a bit and have one SQL command (Sub class) to call when needing to insert, update, delete and select.
I have got one class I am testing with that delete from a table support_ticket and then calls RunSQL() again to delete the corresponding tickets in Support_Reply.
however it only seems to want to delete from one table at a time...as i commented out the first sql and it worked and the second fires...but if the first one is active it doesnt fire.
Do anyone on the forum know why this has happened?
Sub DeleteUserTicket(sender as Object, e as EventArgs)
Dim strSQL1 = "DELETE FROM Support_Ticket WHERE (TicketID = " & txtticketID & ")"
RunSQL(strSQL1)
strSQL1 = "DELETE FROM Support_Reply WHERE (TicketID = " & txtticketID & ")"
RunSQL(strSQL1)
End Sub
'One class to run the sql statements for the entire page this will reduce in repetitve code as well as reduce code size
Sub RunSQL(strSQL)
Dim objCmd As SqlCommand
Dim sqlConn = New SqlConnection(strConn)
objCmd = New SQLCommand(strSQL, sqlConn)
objCmd.Connection.Open()
'Check that the rows can be deleted if not then return a error.
Try
objCmd.ExecuteNonQuery()
response.redirect("ticketsystemtest2.aspx")
Message.InnerHtml = "<b>Ticket " & txtticketID & " Closed</b> <br/>"
Catch ex As SqlException
If ex.Number = 2627 Then
Message.InnerHtml = "ERROR: A record already exists with " _
& "the same primary key"
Else
Message.InnerHtml = "ERROR: Could not update record, please " _
& "ensure the fields are correctly filled out <br>" & ex.Message & " " & ex.Number
Message.Style("color") = "red"
End If
End Try
objCmd.Connection.Close()
sqlConn = nothing
objcmd = nothing
End Sub
cheers
One of our developers just deleted a ton of records- is there any way we can recover this data? (we can't use a backup since a ton of changes were made since we last backed up)
Thanks-
Jack
i am having problem running a simple delete statement against a table. it just hangs is there anything i should look at? the table has 4 primary keys and the index makes up of the 4 keys and ideas?
i viewed the delete statement with the execusion plan and this is what i saw.
delete -> index delete/delete -> sorting the input -> table delete/delete -> Top -> Index scan.
Hi,
I've got a table with about 500 000 records and growing monthly by about 40 000 records
When I perform the following query:
DELETE from [myTable] WHERE Month = '07' AND Year='2005'
This query will take about 10 minutes to execute. Columns Month & Year are both indexed.
Surely MSSQL can't be this slow on only 500 000 records.
Must I do some other database optimization ???
Thanks
Hello, currently I have a query like this:
PHP Code:
SELECT *
FROM relations INNER JOIN
paths ON relations.path = paths.path_id
WHERE
(paths.links = '161') AND (relations.node1 = 162) OR
(paths.links = '161') AND (relations.node2 = 162) OR
(paths.links = '162') AND (relations.node1 = 161) OR
(paths.links = '162') AND (relations.node2 = 161) OR
(paths.links LIKE '162%') AND (relations.node1 = 161) OR
(paths.links LIKE '%162') AND (relations.node2 = 161) OR
(paths.links LIKE '161%') AND (relations.node1 = 162) OR
(paths.links LIKE '%161') AND (relations.node2 = 162) OR
(paths.links LIKE '%161;162%') OR
(paths.links LIKE '%162;161%')
ORDER BY relations.node1
Don't pay attention to the 161 and 162 things, is just test data, now my problem is that I want to transform that into a DELETE statement, but I can't find the right way to do it, so far I managed to do something like:
PHP Code:
DELETE relations
FROM relations INNER JOIN
paths ON relations.path = paths.path_id
WHERE
(paths.links = '161') AND (relations.node1 = 162) OR
(paths.links = '161') AND (relations.node2 = 162) OR
(paths.links = '162') AND (relations.node1 = 161) OR
(paths.links = '162') AND (relations.node2 = 161) OR
(paths.links LIKE '162%') AND (relations.node1 = 161) OR
(paths.links LIKE '%162') AND (relations.node2 = 161) OR
(paths.links LIKE '161%') AND (relations.node1 = 162) OR
(paths.links LIKE '%161') AND (relations.node2 = 162) OR
(paths.links LIKE '%161;162%') OR
(paths.links LIKE '%162;161%')
But that would delete only from the relations table and not from the paths table. I need to delete from both tables.
Can anyone help me please? Its kinda urgent.
Thansk!
Hi,
I need to delete the following records (from enrollment_fact):
SELECT
a."STU_SID",
a."SCHOOL_YEAR",
a."DATE_SID",
a."LOC_SID"
FROM "dbo"."ENROLLMENT_FEX2" b,
"dbo"."LOCATION_DIM" c
LEFT OUTER JOIN
"dbo"."ENROLLMENT_FACT" a
on c."LOC_SID" = a."LOC_SID"
WHERE
b."LOC_KEY" = c."LOC_KEY"
and
a."DATE_SID" between b."MIN_DATE" and b."MAX_DATE"
This is the approach (excuse the misuse of the concat function, but you get the idea)
DELETE FROM "dbo"."ENROLLMENT_FACT"
WHERE CONCAT (a."STU_SID", a."SCHOOL_YEAR", a."DATE_SID", a."LOC_SID")
IN (
SELECT DISTINCT CONCAT (a."STU_SID",
a."SCHOOL_YEAR",
a."DATE_SID",
a."LOC_SID"
)
FROM "dbo"."ENROLLMENT_FEX2" b,
"dbo"."LOCATION_DIM" c
LEFT OUTER JOIN "dbo"."ENROLLMENT_FACT" a
ON c."LOC_SID" = a."LOC_SID"
AND a."DATE_SID" BETWEEN b."MIN_DATE"
AND b."MAX_DATE")
comments? better way? (without using an sp)
thanks
well i have 2 table one name detcom and another entcom stored in DB1 the key for both to join on is lets say A, B, C . I need to check if there are records based on the key A, B, C of both table where C EQUALS to '80_300_113' and if there are delete them and then grab data from another
database named DB2 on same server (same instance) wich contains the same tables entcom and detcom and insert all the data from those tables into the same tables in DB1 based on the key and where C = '80_300_113'
PLZ help
Hi,My question is :
CREATE TABLE t1
(c1 INTEGER,
c2 INTEGER,
c3 DECIMAL(15,0 ))
INSERT INTO t1 VALUES (1, 2, 3.0)
How can i define a SQL commend will cause C1 to be decremented each time a row is deleted from the T2 table?
Thanks !
I have a rather tricky SQL delete query I’m trying to perform, preferably without cursors. I have the following data set, where I want each of the first changes to the status.
IDStatus
1Good
2So-So
3So-So
4Bad
5Bad
6Bad
7Bad
8Bad
9So-So
10Good
So given the above data set I would want to delete the following IDs: 3, 5, 6, 7, and 8. As they not the first in order. The problem is that while I can get isolate and save first instance of each status (in this case 1, 2, and 4), I can’t get the what I want. Is there a SQL way of accomplishing this.
i have problem to discuss regarding delete statement. Due to the bad design of application i have added some duplicate values in table. i have fixed the issue for new insert but how to delete my old bad id. i have table having three column,
ID1 ID2 ID3
101 2 3
102 2 3
103 2 4
104 3 4
in my case first two record are duplicate i want to keep first one and delete the other.
I have duplicate rows of data with the exact same data, for multiple sets of data.For example,
1 Fred Flintstone
1 Fred Flintstone
2 Barney Rubble
2 Barney Rubble
etc...
If I use the delete and where command, it will delete both rows and I want to keep one of them. I don't want to copy down each one and re insert as there are too many columns for each one and there are too many rows also.I was thinking of a delete row-number command in a where statement. but tried multiple forums and its not working.
I have to write a delete statement that deletes all customers that have not put in an order I must use a subquery in the exist operator.
View 5 Replies View RelatedIs it possible to create a function that deletes records from a table ?
CREATE FUNCTION F_TSImported_Delete()
returns int
as
Begin
delete from ts_imported
return 0
end
GO
This throws error like this:
Invalid use of side-effecting or time-dependent operator in 'DELETE' within a function.
i am creating an insert based on a select statement -- i need to delete the row from the select statment table after it has been inserted
something like
insert into table_insert(value1, value2)
(select table_exclude_id, value1, value2 from table exclude)
delete from table_exclude where table_exclude_id in "the select statement"
can you do this?