SQL 2012 :: Difference Between Logical And Physical Join?
Jul 9, 2014What is the difference between Logical Join and Physical Join and there Types?
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Difference In Logical And Physical DB Schemas
Sep 12, 2005What is the difference between the logical database schema and the physical database schema?
Thanks!
What Is Logical And Physical Database Design
May 19, 2008hi we are in the process of developing a project and we r at the initial phase i.e. at the analysis phase and we have been discusssing on what is physical and logical database design. can any body send any links or articals on this will be hightly appreciated.
View 1 Replies View RelatedPhysical Vs. Logical Disk Queue Length
Jun 16, 2003Does anyone have any recommendation on whether it's better to monitor the average queue lenght for physical or logical drives? What about for a RAID set?
Just wondering,
thanks
Is There A Way To Change Logical And Physical Datebase Filenames?
Aug 23, 2006A database was set up as a test database and then the database name changed but the logical and physical filenames still have test in their name - obviously not a good idea. I have tried to change the physical file name but get the error message that the physical file name cannot be changed once the database has been created. I have also tried detaching the database and renaming the mdf and ldf files but these could not be re-attached so had to revert back to the original names.
View 2 Replies View RelatedSQL Server 2008 :: Logical And Physical File Names Of All Databases
Apr 3, 2011Is there a query or sp that I can pull all databases on the server along with their logical file names and physical file names?
View 5 Replies View RelatedAnalysis :: Cube Extracting Data From Physical Or Logical Star Schema?
Oct 22, 2015We have an OLTP database and operational reporting is carried out on a replica server / database. We have plans to build a new data warehouse and an analysis services cube.
Question 1:Should a cube be designed to extract data from a physical star schema rather than a logical one (3NF relational (ODS?) using a data source view to derive the star)? I'm guessing for performance it's better to pull data from similar structures (physical facts and dimensions as required by analysis services) but is the difference significant?
Question 2:Depending on the answer to q1, is it bad practice to ETL data from a staging database (replica > staging) directly to a star schema (multiple data sources and cleansing / business rules required)? Or should it be processed from staging to an ods and only then to a star schema (physical or logical). I still don't know if an ODS is required but I guess the consideration for this decision is whether the business would require daily operational (or ad hoc) reporting on the consolidated data sources (without needing historical DW functionality).
Difference Between Backing Up To A File And A Logical Backup Device?
Jun 16, 2007What's is the between backing up a database to a file and a logical backup device?
If I point the logical backup device to a file on the filesystem, it's same as backing up to a file? isn't?
Thanks
Can Any One Tell Me The Difference Between Cross Join, Inner Join And Outer Join In Laymans Language
Apr 30, 2008Hello
Can any one tell me the difference between Cross Join, inner join and outer join in laymans language
by just taking examples of two tables such as Customers and Customer Addresses
Thank You
Logical Modeling Vs Physical Modeling
Nov 5, 2006Can someone please explain this statement: At the logical level where there can be any number of entities in a relationship while physically you define relationships between two tables.
thx,
Kat
Transact SQL :: Difference Between Inner Join And Left Outer Join In Multi-table Joins?
Oct 8, 2015I was writing a query using both left outer join and inner join. And the query was ....
SELECT
S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
Production.Suppliers AS S LEFT OUTER JOIN
(Production.Products AS P
INNER JOIN Production.Categories AS C
[code]....
However ,the result that i got was correct.But when i did the same query using the left outer join in both the cases
i.e..
SELECT
S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
Production.Suppliers AS S LEFT OUTER JOIN
(Production.Products AS P
LEFT OUTER JOIN Production.Categories AS C
ON C.categoryid = P.categoryid)
ON
S.supplierid = P.supplierid
WHERE
S.country = N'Japan';
The result i got was same,i.e
supplier country productid productname unitprice categorynameSupplier QOVFD Japan 9 Product AOZBW 97.00 Meat/PoultrySupplier QOVFD Japan 10 Product YHXGE 31.00 SeafoodSupplier QOVFD Japan 74 Product BKAZJ 10.00 ProduceSupplier QWUSF Japan 13 Product POXFU 6.00 SeafoodSupplier QWUSF Japan 14 Product PWCJB 23.25 ProduceSupplier QWUSF Japan 15 Product KSZOI 15.50 CondimentsSupplier XYZ Japan NULL NULL NULL NULLSupplier XYZ Japan NULL NULL NULL NULL
and this time also i got the same result.My question is that is there any specific reason to use inner join when join the third table and not the left outer join.
SQL 2012 :: Renaming Logical Filename Of A Database?
Mar 27, 2015If I run an ALTER DATABASE command that renames the Logical file name of a database, will I run into any unseen consequences in terms of day to day use of the database?
View 4 Replies View RelatedSQL 2012 :: Alter Logical FileName During Restore
Aug 12, 2015Can two databases have same logical filenames in the same instance?
In my instance, database already exists say A.
I have to restore DB B with the same backup used for database A in the same instance.
So, once the database B is restored, A and B will have same logical fileNames.
Can I leave it as is? Or do i alter only after B is restored?
Or is there a way where I can change the logical file for B while restoring?
SQL Server 2012 :: Fetch Physical Filenames In Database?
Mar 26, 2015I have a folder with 1000 text(.txt) files in it.
I want to insert the filenames into a table in sql server.
Is it possible in SQL Server 2008..?
SQL Server 2012 :: Compare A Table With Physical Path
Mar 31, 2015I have a table with two columns
id | filepath
--------------------------------------------------
1| D:Doc filesThe BestHHT.JPG
2| D:Doc filesThe Bestsealed_pack.txt
3| D:Doc filesThe Bestlsbom.JPG
4| D:Doc filesThe Bestmoc.png
5| D:Doc filesThe Beststock.txt
6| D:Doc filesThe Bestdepot.JPG
And in a physical system there are more files than the table.
D:Doc filesThe BestHHT.JPG
D:Doc filesThe Bestsealed_pack.txt
D:Doc filesThe BestJKSlsbom.JPG
D:Doc filesThe Bestmoc.png
D:Doc filesThe Beststock.txt
D:Doc filesThe BestGDNdepot.JPG
D:Doc filesThe BestCASA.JPG
D:Doc filesThe BestSO.txt
D:Doc filesThe BestBA.JPG
I want to compare the filepath column in table with physical drive files and get the details of files which in table and not in physical and viceversa...
SQL 2012 :: Unable To Open Physical File - Operating System Error 5
Nov 6, 2015I am trying to attach a database. But I am receiving below error:
Unable to open the physical file "D:databasepc.mdf". Operating system error 5: "5(Access is denied.)".
I have added service accounts to administrator group.
I have provided full control to service account on the D drive and on the .mdf file also.
My self has full permissions on the drive and .mdf file, and I am in administrator group.
Restarted the SQL Server services.Still same error.
Set Difference (I Think) Join
Jul 20, 2005I needed to get a list of rows from a table that is not present inanother table.My problem lies in the fact that I only want SOME of the rows in table2 used in determining existance. This happens because table 2 containshistorical data (based on report date). Table 1 contains my productionlist.I am able to get most of the code done but cannot seem to incorporatethe reportdate column.Based on the code below my output should be as follows:ReportDate = '20031229'Output = 0 rowsReportDate = '20031230'Output = DIA, 123456789ReportDate = anything elseOutput = QQQ, abcdefghiDIA, 123456789CREATE TABLE [Indices] ([Symbol] VARCHAR(10),[Identity] VARCHAR(10))CREATE TABLE [ClearingIndices] ([ReportDate] DATETIME,[Symbol] VARCHAR(10),[Identity] VARCHAR(10))GOINSERT INTO [Indices] VALUES ('QQQ', '123456789')INSERT INTO [Indices] VALUES ('DIA', 'abcdefghi')INSERT INTO [ClearingIndices] VALUES ('20031229', 'QQQ', '123456789')INSERT INTO [ClearingIndices] VALUES ('20031229', 'DIA', 'abcdefghi')INSERT INTO [ClearingIndices] VALUES ('20031230', 'QQQ', 'abcdefghi')GOSELECTI.[Symbol], I.[Identity]FROM[Indices] ILEFT OUTER JOINClearingIndices CIONCI.[Symbol] = I.[Symbol]AND CI.[Identity] = I.[Identity]WHERE--CI.[ReportDate] = '20031230'CI.[Symbol] IS NULLAND CI.[Identity] IS NULL
View 1 Replies View RelatedDifference Between LEFT N RIGHT JOIN
Dec 6, 2005Hi,
I have got a query for you guys. Can any one temme the difference between
"FROM Table_A LEFT JOIN Table_B" and "FROM Table_B RIGHT JOIN Table_A"
;)
Thanks,
Rahul Jha
Difference On Condition In JOIN && WHERE
May 3, 2007I appreciate how difficult it is to resolve a problem without all theinformation but maybe someone has come across a similar problem.I have an 'extract' table which has 1853 rows when I ask for all rows whereperiod_ = 3. The allocation table for info has 210 rows.I have two scripts below. The first script where I specify a period on ajoin, brings back 1853 lines and works. The second script where I specifythe period in the where clause only brings back 1844 rows. I have locatedthe missing 9 rows and they don't look any different to the other 1844 rows.Can someone educate me as to the difference between specifying a conditionon a join and a condition in a where clause.SELECTa.costcentre_,b.nett_,a.*,b.*FROMextract aLEFT OUTER JOINallocation bONa.e_reg_ = b.reg_no_ANDb.period_ = 3WHEREa.period_ = 3--------------SELECTa.costcentre_,b.nett_,a.*,b.*FROMextract aLEFT OUTER JOINallocation bONa.e_reg_ = b.reg_no_WHEREa.period_ = 3ANDb.period_ = 3
View 4 Replies View RelatedDifference Between Inner Join And Intersection
Aug 14, 2006Hi Can anybody explain me what is the difference between inner join and intersection?
I prepare a query but it shows the same results then why we need two functions like this to perform same operation
Thanx-Nagu
Difference Between Explicit Inner Join And Implicit
Mar 31, 2008Is there any difference between explicit inner join and implicitinner joinExample of an explicit inner join:SELECT *FROM employeeINNER JOIN departmentON employee.DepartmentID = department.DepartmentIDExample of an implicit inner join:SELECT *FROM employee, departmentWHERE employee.DepartmentID = department.DepartmentID
View 11 Replies View RelatedSQL Server 2012 :: Summing Logical Reads Each Day For A Server
Oct 2, 2014We would like to benchmark our logical reads daily to show our improvement as we tune the queries over time.
I am using sys.dm_exec_query_stats summing the Physical and Logical Reads. Is this a viable option for gathering this metric? Is this a viable metric to gather?
select sum(total_physical_reads) as TotalPhyReads, sum(total_logical_reads) as TotalLogReads from sys.dm_exec_query_stats;
How best to provide performance based metrics.
SQL 2012 :: Calculating Difference Between Two Times With A Twist (between 9am And 5pm)
Mar 25, 2014I have Two Time fields in a table. Time(0). An "opening time" and a "closing time". They can hold any legit time.
I want to calculate in a SELECT Statement how many minutes within this range are within 9am to 5pm (which I'll convert to hours).
For example, here's an easy example:
OPEN: 9:00:00
CLOSE: 17:00:00
8 Hours/480 minutes
I could get this easy enough with a DATEDIFF function.
But what about:
OPEN: 08:00:00
CLOSE: 18:00:00
10 Hours total but only 8 of those 10 are within 9am-5pm.
Or what about:
OPEN: 10:00:00
CLOSE: 20:00:00
10 Hours total but only 7 are within 9am-5pm range.
I can calculate the total hours/minutes between the two times but not within that special range.
SQL 2012 :: How To Calculate Date Difference In Months
Jan 23, 2015I would like to calculate difference between end_date and current date in Months.And also how we can calculate the sum of difference in months between start_date and end_date for each ID?
CREATE TABLE datedifference (
id INT
,start_date INT
,end_date INT
)
INSERT INTO datedifference VALUES (10,20091202,20100629)
INSERT INTO datedifference VALUES (20,20071202,20090330)
INSERT INTO datedifference VALUES (30,20051202,20101031)
SQL Server 2012 :: Behavioral Difference Between DELETE And TRUNCATE
Apr 4, 2014I have an issue with Delete statement.In the code given below (its a part of actual proc),if we use TRUNCATE to clean the temp tables, everything goes fine.But if I use DELETE in place of truncate, system skips the IF loop 'if (@script_type = 1 OR @script_type = 2)'I am not able to understand this behavioral difference between DELETE and TRUNCATE.Recently the database is being used for replication, but that should not be a reason.
SELECT @max_rows = COUNT('X') FROM #temp_table1
SET@row_cnt = 1
WHILE @row_cnt <= @max_rows
BEGIN
[code],...
SQL Server 2012 :: Difference Between Two Dates (Excluding Weekends)
May 19, 2014I have a table with a list of jobs along with their start and end datetime values.
I am looking for a function which will return the time taken to process a job using a start date and an end date. If the date range covers a Saturday or Sunday I want the time to ignore the weekends.
Example
Start Date=2014-05-15 12:00:00.000
End Date=2014-05-19 13:00:00.000
Total Time should be: 2 Days, 1 Hour and 0 Minutes
SQL 2012 :: Difference Between Estimated And Actual Number Of Rows?
Oct 20, 2014I have found execution plan with significant difference between actual and estimated number of rows (roughly actual/2=estimated) in non-clustered index seek.Statistics are updated.
View 9 Replies View RelatedSQL 2012 :: Calculate Time Difference For Consecutive Rows?
Jul 2, 2015I have a table like this.
CREATE TABLE Table1
([S_ID] varchar(7), [S_ACTV_CODE] varchar(4), [S_USER] varchar(5), [S_DATETIME] varchar(19), [S_ACT_IND] int)
;
INSERT INTO Table1
([S_ID], [S_ACTV_CODE], [S_USER], [S_DATETIME], [S_ACT_IND])
VALUES
('AAA-111', NULL, 'USER1', '2015-06-15 00:21:06', 0),
('AAA-111', '2', 'USER1', '2015-06-15 00:21:07', 0),
[code]....
Basically I want to calculate the time spent by S_Users on a particular S_ACTV_CODE:
- S_ACTV_CODE_PREV means the previous active records.
- S_START_TIME is the time of S_DATETIME when a S_ACTV_CODE starts
- S_END_TIME is the time before a S_ACTV_CODE changes to another S_ACTV_CODE
- For the first record, S_ACTV_CODE is null, so there is no S_ACTV_CODE_PREV, so S_ACTV_CODE_PREV is NULL
- For the second record S_ACTV_CODE has some value, but S_ACTV_CODE_PREV is NULL for first record. So second record S_ACTV_CODE_PREV is also NULL
- For the last record (means S_ACTV_IND = 1), the user is currently working on it and S_ACTV_CODE is not changed. So S_END_TIME is a open time and we want to keep it as NULL
So the result should be as below:
S_ID S_ACTV_CODE_PREV S_ACTV_CODE_CURR S_USER S_START_TIME
S_END_TIME TIME_SPENT (in Sec)
AAA-111 NULL NULL USER1 2015-06-15 00:21:06
2015-06-15 00:21:07 1
AAA-111 NULL 2 USER1 2015-06-15 00:21:07
2015-06-17 03:20:33 183566
AAA-111 2 4 USER2 2015-06-17 03:20:33
[code]....
SQL Server 2012 :: How To Calculate Dates Difference In A Same Table
Sep 4, 2015I have a table with appdt as first appointment date and the another record for the same customer# has follow up appointment.
Each customer is uniquely identified by a customer#
I need to find out if the customer came back after 200 days or more when the first appointment date was between jan12014 and Aug 31 2014. I am only interested in first follow up appointment after 30 days or more.
How can i do that in a query?
SQL Server 2012 :: Difference Between Two Date / Times And Flag Each Hour In Between
Dec 31, 2013I have a request where i would like to get the start date/time and end date/time and flag (with an int) which hours (24 hour clock) have values between the two dates. Example car comes into service on 2013-12-25 at 0800 and leaves 2013-12-25 at 1400 the difference is 6 hours and i need my table to show
Column: Hour_6 Value: 0
Column: Hour_7 Value: 0
Column: Hour_8 Value: 1
Column: Hour_9 Value: 1
Column: Hour_10 Value: 1
Column: Hour_11 Value: 1
Column: Hour_12 Value: 1
Column: Hour_13 Value: 1
Column: Hour_14 Value: 0
As i'm working away at it i'm trying to figure out how i could use a Time Dimension table for this but dont really see much. So far i have the difference between the two times in hours (hour_diff) and the start hour (min_hour) so i would like to do something where i update the first hour (min_hour) and update columns based on the numbers of hours (hour_diff)
SQL 2012 :: Using LEAD Function To Show Previous Month Difference?
Mar 25, 2014I have 12 month report and I need show volume and difference between current and prev month volume, what is the smart way to do this, do I need to put prev month value onto same row horizontally? I think should be some other smart way, I heard about LEAD function?
This what I think for now, It should be listed per ClientID also, in my example I have single ClientID for simplicity.
I tried to do LEAD but with not success..
/*
IF OBJECT_ID('tempdb..#t') is not null drop table #T;
WITH R(N) AS
(SELECT 1 UNION ALL SELECT N+1 FROM R WHERE N <= 12 )
SELECT N as Rn,
10001 ClientID,
DATENAME(MONTH,DATEADD(MONTH,-N,GETDATE())) AS [Month],
[code]....
SQL Server 2012 :: New Column Calculation Based On Running Difference
Aug 15, 2014New column calculation
CREATE TABLE MAIN
(
ORDERNO VARCHAR(20),
LASTUPDATEDDATE DATE,
ORDERCLIENTINITIALFEE NUMERIC ,
[Code] .....
---OUTPUT
--=======
INSERT INTO MAIN VALUES ('1000', '1/1/2014',3000,1000,700,1500)
INSERT INTO MAIN VALUES ('1000', '3/5/2014',1000,2000,650,200)
INSERT INTO MAIN VALUES ('1000', '5/10/2014',500,5000,375,125)
INSERT INTO MAIN VALUES ('1000', '11/20/2014',100,2000,400,300)
INSERT INTO MAIN VALUES ('1000', '8/20/2014',100,3500,675,1300)
[Code] ....
SQL Server 2012 :: How To Subtract A Column From A Query Result And Add Difference To Another
Mar 20, 2015I have a query which provides the below result set:
1165 6
1,173.0013
9740 6
9820 13
2271 6
2287 13
10,952.006
11,029.0013
4,074.006
4,103.0013
I want to achieve something like below. It should subtract the '13' row to '6' row and provide another column with the result. the '6' and '13' category code share the same Key.
1165 6 -8.00
1,173.0013-8.00
9740 6 -80
9820 13 -80
[code]...