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Hello..i have a question about SQL Statements
In my database, i have a data about datetime. The example as shown below:
2014-03-25 17:57:34.177
2014-03-25 18:01:25.280
2014-03-25 18:01:28.240
2014-03-25 18:01:33.207
This is just a few example but in my database the data is more than this.So how if i want to display the data from 30 minutes ago? what is the sql statement should I use?
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SELECT * FROM tablename WHERE datefield > DateADD(mi, -30, Current_TimeStamp)
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tq  and if i want to show from 1 hours is it like this SELECT * FROM tablename WHERE datefield > DateADD(mi, -60, Current_TimeStamp)?
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tqvm for helping me
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Hye peter, this code seems did'nt work..when I execute this SQL to the database directly, it will show no result 
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Seeing is believing. try this: http://sqlfiddle.com/#!3/1fa93/13028
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Hi
I need to multiply two columns (float) each of which can have a max of 4 decimal places and round the result to 3 decimal places.
It seems the ROUND(val,decimal_places) uses bankers rounding? (SQL Sever 2008R2) - Although I have read it uses Symmetric Arithmetic Rounding?
Doing the same calculation in Excel gives me the result I need, but Excel uses normal Arithmetic rounding.
How can I do a query to use arithmetic rounding (like Excel)
Examples of the errors:
Price Qty Val ExcelRound SQLRound
7.5169 745 5600.0905 5600.091 5600.090
4.3465 463 2012.4295 2012.430 2012.429
1.6401 125 205.0125 205.013 205.012
0.0395 369 14.5755 14.576 14.575
5.2349 955 4999.3295 4999.330 4999.329
9.0285 141 1273.0185 1273.019 1273.018
9.0899 645 5862.9855 5862.986 5862.985
3.6167 215 777.5905 777.591 777.590
3.1145 135 420.4575 420.458 420.457
7.4115 105 778.2075 778.208 778.207
7.8675 313 2462.5275 2462.528 2462.527
8.8405 227 2006.7935 2006.794 2006.793
5.4269 55 298.4795 298.480 298.479
1.8833 445 838.0685 838.069 838.068
9.7349 655 6376.3595 6376.360 6376.359
8.6487 365 3156.7755 3156.776 3156.775
1.9033 125 237.9125 237.913 237.912
4.8197 545 2626.7365 2626.737 2626.736
PS: how do you post a table with nicely formatted columns?
modified 9-May-14 17:33pm.
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I think the general consensus is that it makes more sense to do that kind of formatting in your report, rather than in your database query.
The difficult we do right away...
...the impossible takes slightly longer.
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Hi Richard
Thanks for your reply. In my case here, a customer was requesting a Purchase Order in pdf format, as well as Excel format. I was doing the rounding with a formula in Excel, but the formula did not always fill down to all the rows of the table which is why I decided to do the rounding in the query.
Also, quite often, in Winform apps, I pull a query into a DataTable, and set the DataTable as a DataGridView DataSource, in which case it seems more practical to do the rounding in the query as opposed to looping through the DataTable, and adding the rows with the rounded value to the DataGridView?
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Hi,
The problem is not a ROUND function, but the precision of the FLOAT data type (Using decimal, float, and real Data[^]). You have at least a couple of options:
1. Use DECIMAL or NUMERIC instead of the FLOAT.
2. CAST to DECIMAL for the calculation.
Here's the demonstration for you (using your first example):
1. Select using ROUND.
SELECT ROUND((7.5169 * 745), 3) AS Result;
or
SELECT ROUND(5600.0905, 3) AS Result;
Result: 5600.0910
2. Using FLOAT variables.
DECLARE @a FLOAT, @b FLOAT, @c FLOAT;
SET @a = 7.5169;
SET @b = 745;
SET @c = @a * @b;
SELECT ROUND(@c, 3) AS Result;
Result: 5600.09
3. Using DECIMAL variables.
DECLARE @a DECIMAL(18, 4), @b DECIMAL(18, 4), @c DECIMAL(18, 4);
SET @a = 7.5169;
SET @b = 745;
SET @c = @a * @b;
SELECT ROUND(@c, 3) AS Result;
Result: 5600.0910
P.S. I am posting such data with the XML pre tag. Also, I am inserting (copying) TAB characters (if needed).
Best regards,
Andrius Leonavicius
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Hi Andrius
Thanks So much.
Tested below with the same random sample of 300 values, and all agreed with the Excel Values!
select price
, qty
, price*qty as Val
, round(CONVERT(decimal(12,4),price)* CONVERT(decimal(12,4),qty),3) as RoundVal
from dbo.[round]
What mis-lead me into thinking the problem was with the type of rounding was that from my sample of 300 values, all the values that differed had a 5 in the 4th decimal place, and all the errors were not rounded as expected.
In the link you poseted:
Using float and real Data
The float and real data types are known as approximate data types. The behavior of float and real follows the IEEE 754 specification on approximate numeric data types.
...
The IEEE 754 specification provides four rounding modes: round to nearest, round up, round down, and round to zero. Microsoft SQL Server uses round up. All are accurate to the guaranteed precision but can result in slightly different floating-point values. Because the binary representation of a floating-point number may use one of many legal rounding schemes, it is impossible to reliably quantify a floating-point value.
Thanks for your help!
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You're welcome.
Best regards,
Andrius Leonavicius
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My Table has millions of records and my query is fetching 500 million records for 1 day to the SSRS report. so, It is taking too long time to fetch the data. Could anybody can suggest me how to narrow down or improve my query.
Thanks in Advance,
Avinash.
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Without seeing the query, how can anyone suggest how to narrow it down?
The difficult we do right away...
...the impossible takes slightly longer.
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avi_dadi2002 wrote: my query is fetching 500 million records
Seriously? Try calculating how long that would take at 500 records per second.
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Hi,
I need to fetch data from two different data sources in a single select query in DB2 environment. For Example.
My DB@ env has two are different data sources named as XXX5T and XXXXX5P.
Each data source(Host) has multiple databases, i want to fetch some records from two different tables, one table is available in XXX5T and 2nd one exist in XXXXX5P.
Select p,q,r from XXX5T.MyDB5T.MyTable a
INNER JOIN XXX5P.MyDB5P.MyTable b on a.id= b.id.
Thanks in advance.
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Sorry - never read your question properly... (Not sure about DB2)
but in any case...
Perhaps UNION ALL is what you are looking for.
(Columns in both selects must be the same)
select p, q, r
from XXX5T.MyDB5T.MyTable
UNION ALL
select p, q, r
from XXX5T.MyDB5P.MyTable
also see Linked Servers http://msdn.microsoft.com/en-us/library/ms188279.aspx[^]
modified 10-May-14 4:08am.
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We have a relational DB in SQL Server 2008 which grinds up monthly data sets based on a set of criteria, these runs can take between 2 and 4 hours to produce and there may be 10-12 per month in 3-4 run sets. I am proposing that each run set has a cube for reporting and analysis.
The results are stored in 2 (fact) tables, each table has a view which pulls in the dimension fields, date, branch, product etc.
Each Run can result in +7m rows
Q1 Should I replicate the data into a reporting database before building the cube or build direct from the relational DB?
Q2 It has been recommended that I use the views, do I also need to pull in the dimension tables or can I use the fields in the view? eg Product dimension is serviced by a distinct of the Product column (answer - use the dimension table for cases where there is no record for a dimension element this period  ).
Never underestimate the power of human stupidity
RAH
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I am currently working on dash board application, I have a table say ‘User_data_master’
User_data_master(‘id’, ‘uid’, ‘data’, ‘instid’,’deptid’)
Id-primary key
uid- user id referred to user bio data
data- data posted
deptid- department id
instid- institute id
Above table will store data for different employee from different department of an institution
In select query I need to get my rows belongs to me (I have saved), Then people from my department,
Then rest of rows which belongs to my Institute.
Any help is appreciated mostly
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Hello Everyone
In my application there is a login and logout functionality.if i forget to logout and logout next day. i am unable to get the accurate difference between login and logout at backend..please can anyone help me
Thank you
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Check the DAY component of the logout datetime value!
Never underestimate the power of human stupidity
RAH
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I have a database(Eg. SALES) in SQL Server 2014 which needs to be recreated in SQL Server 2012 version. Since I can not use the SQL 2014 back up file in SQL 2012 environment, I have proceed with the Generate Script option and trying to run the script in SQL Server 2012 environment. However it is giving an error as Msg 102, Level 15, State 6, Line 1
Incorrect syntax near 'DELAYED_DURABILITY'. which is pointing to the ALTER DATABASE [SALES] SET DELAYED_DURABILITY = DISABLED line in the script and not able to proceed further. Please help me to get this sorted out.
Thanks,
KV
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As mentioned in the Lounge, remove that setting as it is new to 2014.
There are only 10 types of people in the world, those who understand binary and those who don't.
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