Ranged Datetime Predicates && Cardinality Estimates
Mar 27, 2006
Hello all. I'm running SQL Server 2000 and I'm trying to get a very
few, recent rows of data from a table based on an indexed datetime
column. Here's my predicate:
where order_date > dateadd(hour, -1, getdate())
i.e. everything more recent than one hour ago. This corresponds to the
3 or 4 rows in which I'm interested. I have order_date indexed and I
have current statistics. When I check the explain plan for this query
I see expected rows returned: 114,000. When I go on to join to several
other tables I end up with unnecessary hash joins -- due to the
inaccurate cardinality estimates on this table.
However, if I use the following predicate (which corresponds to data
within the last 3 days):
where order_date > '2006-03-24'
then I see an estimated rows returned: 6 -- which is pretty accurate.[color=blue]
>From there the rest of the query's explain plan falls together nicely.[/color]
So my question is: how do I get the optimizer to realize that one hour
ago is pretty recent?
Many thanks,
Scott
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Jun 15, 2008
How can I select data between Mth row and Nth row from a specific search condition? for example , I want to get the 5th to 10th employee who is born in March and ordered by their name.
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Jan 7, 2008
I'm just starting to dabble around with LINQ and all of the examples I've come across all have 1 where clause. Is this intentional such that we are supposed to build queries on top of queries or is there a method in which I can add multiple predicates to my 1 query? I'm sorry if this sounds like a stupid question, I've been googling it to death and reading the few manuals on LINQ but like I said, all of the examples have had 1 where predicate.
Thanks,
Chance
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Jan 16, 2015
I was reading this blog below about Indexed Views and needed some clarification.
When the author choose to create the unique clustered index he excluded the PER.BusinessEntityID columns and only included, (CustomerID, SalesOrderID, ProductID).
Why didn't the PER.BusinessEntityID get added?
[URL] ....
CREATE VIEW Sales.vSalesSummaryCustomerProduct
WITH SCHEMABINDING
AS
SELECT CUST.CustomerID ,
SOH.SalesOrderID ,
SOD.ProductID ,
SUM(SOD.OrderQty) AS TotalOrderQty ,
[Code] .....
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Jul 23, 2005
-----Cross posted on comp.databases.ms-sqlserver andmicrosoft.public.sqlserver.programming-----Can someone please explain cardinality to me? I am having a problem with aninsert from a webpage.When a user adds a venue with an event I need both tables to populate.Currently only the event table populates the right info and the venue doesnot. I am using SELECT SCOPE IDENTITY to get the last inserted venue toassociate with each event. That is to say that each event has a column forvenue and that value is incorrectly being added as 0, the default value. Thevenue is not getting added.It worked fine until I got to ID number 87 which was the 62nd venue.When I look at my table structure in php myadmin my cardinality is differentdepending on what field. ID is 67 and Address is 6. Something seems wierd,but I don't understand cardinality so much.Thanks!
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Sep 7, 2006
The problem is in one-to-many cardinality and UPDATE statement :
( SQL server 2005 developer edition )
create table #table1( id int, firstCol int)
insert #table1 values ( 1,0)
insert #table1 values ( 2,0)
go
create table #table2( id int, secondCol int)
insert #table2 values ( 1,10)
insert #table2 values ( 1,20)
insert #table2 values ( 1,30)
insert #table2 values ( 3,100)
go
-----------------------------------------------------------------------------
1. shape UPDATE
update #table1 set firstCol = firstCol +( select secondCol from #table2
where #table1.id = #table2.id )
return error message :
Msg 512, Level 16, State 1, Line 1
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.
2. shape UPDATE
update r set firstCol = firstCol + s.secondCol
from #table1 r
join ( select id,secondCol from #table2 ) s
on r.id = s.id
return message : (1 row(s) affected)
and #table1 is updated only one of row ( generally random ) from #table2 for ID = 1
select * from #table1
id firstCol
----------- -----------
1 10
2 0
3. shape UPDATE
update #table1 set firstCol = firstCol + secondCol
from #table2 where #table1.id = #table2.id
return message : (1 row(s) affected)
and #table1 is updated only one of row ( generally random ) from #table2 for ID = 1
-----------------------------------------------------------------------------
Is it normal ? I expected error message or summary value for ID = 1 from #table2 .
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Sep 14, 2006
sql server 2005
sql server mangement studio
Hi I am using the databse diagrammer to create a database.
creating the tables and fields is no problem but there seems to be a lack of choice with joins and I cannot see how to set cardinality.
any help appreciated.
B
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May 8, 2007
I am trying to understand constraints and minimum cardinality.
In a relationship between 2 tables, t1 and t2, with a parent to child relationship of
1 to 1 or more
how is the minimum cardinality enforced?
If both sides of the relationship require at least one occurrence, how would the insert be done? How can you insert into table t1 when it has a constraint that there must be an occurrence in table t2, or vice versa?
Any help in understanding this is greatly appreciated!
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Jul 22, 2013
DELETE FROM [SCS_NAV2009R2_PROD].[dbo].[Payroll Ledger Entry]
gives this error
Msg 9002, Level 17, State 4, Line 1
The transaction log for database 'SCS_NAV2009R2_PROD' is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases
~ 7,000,000 records
now i have set the log to autogrow and set the max size to 2tb
what else can i do to get this going?
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May 18, 2015
Over the weekend I decided to give it the ability to do a case sensitive character swap. Updating the code was pretty straight forward but when I was through, I noticed that I was getting Cardinality Estimate warnings that I wasn't getting before.
Anyway, here is some test data and two versions of the executed SQL (the base code is all dynamic and the two code versions are the result of toggling the @MatchCase parameter).
/* ========================================
CREATE TABLE
======================================== */
CREATE TABLE [dbo].[PersonInfoSmall](
[PersonID] [BIGINT] NOT NULL,
[FirstName] [NVARCHAR](50) NOT NULL,
[MiddleName] [NVARCHAR](50) NULL,
[LastName] [NVARCHAR](50) NOT NULL,
[code]....
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Jul 20, 2005
I have two tables that are related by keys. For instance,Table employee {last_name char(40) not null,first_name char(40) not null,department_name char(40) not null,age int not null,...}Employee table has a primary key (combination of last_name and first_name).Table address {last_name char(40) not null,first_name char(40) not null,street char(200) not null,city char(100) not null,...}Address table has a primary key (combination of last_name, first_name andstreet in which (last_name, first_name) reference (last_name, first_name) inemployee table.Now I want to delete some rows in Address table based on department_name inEmployee table. What is sql for this delete?I appreciate your help. Please ignore table design and I just use it for myproblem illustration.Jim
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Jul 9, 2007
Hi,
I'm inserting a datetime values into sql server 2000 from c#
SQL server table details
Table nameate_test
columnname datatype
No int
date_t DateTime
C# coding
SqlConnection connectionToDatabase = new SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=testdb;Integrated Security=SSPI");
connectionToDatabase.Open();
DataTable dt1 = new DataTable();
dt1.Columns.Add("no",typeof(System.Int16));
dt1.Columns.Add("date_t", typeof(System.DateTime));
DataRow dr = dt1.NewRow();
dr["no"] = 1;
dr["date_t"] = DateTime.Now;
dt1.Rows.Add(dr);
for(int i=0;i<dt1.Rows.Count;i++)
{
string str=dt1.Rows["no"].ToString();
DateTime dt=(DateTime)dt1.Rows["date_t"];
string insertQuery = "insert into date_test values(" + str + ",'" + dt + "')";
SqlCommand cmd = new SqlCommand(insertQuery, connectionToDatabase);
cmd.ExecuteNonQuery();
MessageBox.Show("saved");
}
When I run the above code, data is inserted into the table
The value in the date_t column is 2007-07-09 22:10:11 000.The milliseconds value is always 000 only.I need the millisecond values also in date_t column.
Is there any conversion needed for millisecond values?
thanks,
Mani
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Dec 6, 2006
I'm getting error:
String was not recognized as a valid DateTime.
my insert parameter:
<asp:Parameter Name="LastModified" Type="DateTime" DefaultValue= "<%=DateTime.Now.ToString() %>"
my insert command:
InsertCommand="INSERT INTO [Product] ([Enabled], [ProductCode], [ProductName], [ProductAlias], [CarrierId], [DfltPlanId], [DoubleRating], [DoubleRateProductId], [ConnCharges], [StartDate], [EndDate], [Contracted], [BaseProductId], [LastModified], [LastUser]) VALUES (@Enabled, @ProductCode, @ProductName, @ProductAlias, @CarrierId, @DfltPlanId, @DoubleRating, @DoubleRateProductId, @ConnCharges, @StartDate, @EndDate, @Contracted, @BaseProductId, @LastModified, @LastUser)"
LastModified is a datetime field.
Running sql2005
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Mar 14, 2007
Hi all, having a little problem with saving dates to sql databaseI've got the CreatedOn field in the table set to datetime type, but every time i try and run it i get an error kicked up Error "The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.The statement has been terminated."I've tried researching it but not been able to find something similar. Heres the code: DateTime createOn = DateTime.Now;string sSQLStatement = "INSERT INTO Index (Name, Description, Creator,CreatedOn) values ('" + name + "','" + description + "','" + userName + "','" + createOn + "')"; Any help would be much appreciated
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Mar 17, 2007
Hey :)I'm facing a lot of troubles trying to create a new pause/break-system. Right now i'm building up the query that counts how many records that is inside 2 fields. Let me first show you my table:
ID (int) | stamp_start (Type: DateTime) | stamp_end (Type: DateTime) | Username (varchar)0 | 17-03-07 12:00:00 | 17-03-07 12:30:00 | Hovgaard
The client will enter a start time and a end time and this query should then count how many records that are inside this periode of time.
Example: The client enter starttime: 12:05 and endtime: 12:35.The query shall then return 1 record found. The same thing if the user enters 12:20 and 12:50.My current query looks like this:SELECT COUNT(ID) AS Expr1 FROM table WHERE (start_stamp <= @pausetime_start) AND (end_stamp >= @pausetime_end)But this will only count if I enter the exact same times as the one inside the table.Any ideas how I can figure this out?Thanks for your time so far :)/Jonas Hovgaard - Denmark
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May 13, 2006
Hi,
I have a column of type datetime in sqlserver 2000. Whenever I try to insert the date
'31/08/2006 23:28:59'
I get the error "...datetime data type resulted in an out-of-range datetime value"
I've looked everywhere and I can't solve the problem. Please note, I first got this error from an asp.net page and in order to ensure that it wasn't some problem with culture settings I decided to run the query straight in Sql Query Anaylser. The results were the same. What else could it be?
cheers,
Ernest
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Mar 11, 2014
I am inserting date and time data into a SQL Server 2012 Express table from an application. The application is providing the date and time as a string data type. Is there a TSQL way to convert the date and time string to an SQL datetime date type? I want to do the conversion, because SQL displays an error due to the
My date and time string from the application looks like : 3/11/2014 12:57:57 PM
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Sep 7, 2007
Nothing difficult, I just need a way to generate a new datetime column based on the column [PostedDate], datetime. So basically I want to truncate the time. Thanks a lot.
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Jan 17, 2008
e.g.
1st March 2005 12:00:00
is showing as
01/03/2005 00:00:00
instead of
01/03/2005
Why does this happen?
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Jun 15, 2004
I have the following SQL:
select convert(datetime,'04-20-' + right(term,4)) as dt,
'Deposit' as type, a.* from
dbo.status_view a
where right(term,4) always returns a string which constitutes a 4 digit year eg '1999','2004',etc.
The SQL above returns
2004-04-20 00:00:00.000 Deposit ...
Which makes me think that it is able to successfully construct the datetime object inline. But then when I try and do:
select * from
(
select convert(datetime,'04-20-' + right(term,4)) as dt,
'Deposit' as type, a.* from
dbo.status_view a
) where dt >= a.submit_date
I get the following error:
Syntax error converting datetime from character string.
Given that it executes the innermost SQL just fine and seems to convert the string to a datetime object, I don't see why subsequently trying to USE that datetime object for something (in this case comparison with submit_date which is a datetime in the table a) should screw it up. Help!!! Thanks...
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Jul 20, 2005
Hi,I have a text file that contains a date column. The text file will beimported to database in SQL 2000 server. After to be imported, I wantto convert the date column to date type.For ex. the text file look likeName dateSmith 20003112Jennifer 19991506It would be converted date column to ydm database in SQL 2000 server.In the table it should look like thisName DateSmith 2000.31.12Jennifer 1999.15.06Thanks in advance- Loi -
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Nov 5, 2007
Hi,
I am trying to access a date column up to millisecond precession. So I cast date to as follows:
Code BlockCONVERT(varchar(23),CREATE_DATE,121)
I get millisecond part as a result of query but it€™s €œ000€?.
When I try to test the format by using getDate instead of DateTime column I get right milliseconds.
CONVERT(varchar(23),GetDate(),121) --Gives right milliseconds in return
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Sep 11, 2007
hi,
How do i convert a varchar field into the datetime data type? the reason i need this lies in the requirement that in the earlier data base the column that is hlding the date value is having the data type as varchar. and in the new design the column data type is datetime. i am using sql scripts for the data migration from the older design to the newer and got stuck with this datetime convertion issue. do let me know the best possible solution.
following are the sample data that is theer in the older table for the date.
12/12/2003
1/13/2007
01132004
1-1-2004
1.2.2001
there is no uniformity of the data that is stored currently.
thnkx in adv.
rahul jha
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May 21, 2015
I have a table that has a unique ID and a datetime of when something changed.
See example:
IDÂ Â Â TimeStamp
16094Â Â Â 2013-11-25 11:46:38.357
16095Â Â Â 2013-11-25 11:46:38.430
16096Â Â Â 2013-11-25 11:46:38.713
16097Â Â Â 2013-11-25 11:46:38.717
16098Â Â Â 2013-11-25 11:46:38.780
[Code] ....
Is there a way I can calculate the difference between row 16106 and 16105 and enter it in line 10601.
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May 2, 2007
hi friends,
how to get the date of the first/last day of the week in sql...
can any one help me
Cheers,
raj
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Aug 3, 2015
How can I calculate a DateTime column by merging values from a Date column and only the time part of a DateTime column?
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Jan 28, 2008
update tblPact_2008_0307 set student_dob = '30/01/1996' where student_rcnumber = 1830when entering update date in format such as ddmmyyyyi know the sql query date format entered should be in mmddyyyy formatis there any way to change the date format entered to ddmmyyyy in sql query?
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Jun 9, 2008
Hi All,This is only my second day using C#/asp.net and English isn't my native language so I'll apologise in advance if this question doesn't make sense and/or is stupid . I'm trying to make a little event planner which was going well until I hit a small problem, the user needs to enter the event name and choose a date/time from dropdowns, this bit works okay... however I'm having difficulties with storing the date/time, at the moment I'm making a DateTime object and filling out the year/month/day/hour/minute selected on the form and adding that to the database field (which is a datetime field type).Problem is, I'm using the date format DD/MM/YYYY HH:MM:SS but the database stores it as MM/DD/YYYY HH:MM:SS so if I wanted to do things like:
select * from tbl where date > DateTime.Now - it isn't going to work because the month is switched with the day in the DB-versions.
Just to try and give another example, if I'm not being very clear, if I print DateTime.Now.ToString() it will display 10/06/2008 02:50:48 however if I put it into the database and pull it back out cast to a DateTime Object and then display that object via ToString() it'll be 06/10/2008 02:50:48
Any suggestions on what to do would be appreciated, usually in cases like this I'd just use the unix timestamp, but since C#/ASP.NET doesn't support that natively I was hoping there was an easier/native alternative. Also I don't have access to the server configuration so changing the localization of mssql isn't an option unfortunately.Thanks in advance!
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Dec 14, 2005
After testing out the application i write on the local pc. I deploy it to the webserver to test it out. I get this error.
System.Data.SqlClient.SqlException: The conversion of a char data type to a
datetime data type resulted in an out-of-range datetime value.
Notes: all pages that have this error either has a repeater or datagrid which load data when page loading.
At first I thought the problem is with the date, but then I can see
that some other pages that has datagrid ( that has a date field) work
just fine.
anyone having this problem before?? hopefully you guys can help.
Thanks,
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Apr 19, 2008
Advance thanks ....... My table is TimeSheet:----------------------------------- CREATE TABLE [dbo].[TimeSheet]( [autoid] [int] IDENTITY(1,1) NOT NULL, [UserId] [int] NOT NULL, [starttime] [datetime] NOT NULL, [endtime] [datetime] NOT NULL, [summary] [nvarchar](50) NOT NULL, [description] [nvarchar](50) NULL, [dtOfEntry] [datetime] NOT NULL, [Cancelled] [bit] NULL) ON [PRIMARY] My Query is------------------ insert into timesheet (UserId, StartTime,EndTime, Summary, Description,DtOfEntry) values (2, '19/04/2008 2:05:06 PM', '19/04/2008 2:05:06 PM', '66', '6666','19/04/2008 2:05:06 PM')i m not able to insert value Error Message is-------------------------Msg 242, Level 16, State 3, Line 1The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.The statement has been terminated. can any body give any solution
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Aug 3, 2005
Hey, I have a big problem that i wanna search data from SQL by DateTime like thatselect * from test where recorddate='MyVariableWhichHoldDate'i use variable that holds Date info.i searched a lot infomation on net but there is no perfect solution. i know why this occur but there is no function to solve this problem. i used a lot of ways. it accept yyyy-mm-dd format but my variable format is dd-mm-yyyyy . is there any function for this problem? and any other solution.thanks for ur attentionregards
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Jan 15, 2008
Hello,
I used datetime as the data type for my table. But when I display the table in my GridView I get dates in the format 12/30/2007 12:00:00 AM. What datatype should I use if I want dates of the format 12/30/2007 without the time? Thanks. I
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Mar 18, 2008
I feel really stupid asking this but im not at home and dont have my sql book with me so here it goes. How do I use Datetime? I want i want to use the built in function to do it. So would i like do something like Date = getdatetime()?
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