SQL #57–A one-liner query with PARTITION BY
What can be done in SAS must be possible in SQL
A friend of mine is a data professional in marketing data...
2015-01-22 (first published: 2015-01-17)
10,440 reads
Learning SQL #1–Start from buying a Copy of SQL Server Developer Edition
If learning SQL is in your New Year Resolution, then you will be happy to read this post.
We all make...
2015-01-09
1,039 reads
SQL #56–Aggregation with ROLLUP operator is not fully supported
ROLLUP, CUBE, and GROUPING SETS Operators have been around since SQL Server 2005. These operators are extensions of the GROUP...
2015-01-05 (first published: 2014-12-31)
8,619 reads
5th Blogging Year
It’s hard to believe that it’s been 5 years since my first ever post, in which I simply spelled Business Intelligence. Thanks...
2014-12-31
1,041 reads
SSIS #118–Is it an OLEDB or an SMO Server Connection?
OLEDB is the native client for SQL Server. Every SSIS developer is familiar with how to use it. Almost every...
2014-12-23 (first published: 2014-12-17)
7,861 reads
SQL #55 – Data Types and Storage Reference
When we design a database, we usually need to do an estimate on the size of the database based on the...
2014-12-19
1,085 reads
SSAS #39–Building Optimal and Well-Tuned Dimensions
The Analysis Services Performance Guide from bunch of Microsoft Analysis Services experts have been updated since 2005 edition for 2008 R2...
2014-12-14
1,477 reads
SSIS #117–What is the Location in the MSOLAP Connection String
MSOLAP is a native OLE DB provider for Analysis Services
A common task during ETL is to process the OLAP dimensions and the...
2014-12-13
3,096 reads
MDX #45–Find all the Calculated Sets and Their Calculation Scripts
Now we know how to find all the calculation scripts in a cube by querying the DMV $SYSTEM.MDSCHEMA_MEASURES.
MDX #43–Find a MDX...
2014-11-21 (first published: 2014-11-14)
5,719 reads
MDX #42–IsEmpty? or = 0 ? or IS NULL?
In SQL, NULL means undefined value
Any SQL programmer can tell you that zero is not NULL, NULL is not zero, and...
2014-11-18 (first published: 2014-11-12)
22,713 reads
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Simple delete causes table scan on other tables with foreign key
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Question of the Day
Checking Identities
The DBCC CHECKIDENT command is used when working with identity values. I have a table with 10 rows in it that looks like this:
TravelLogID CityID StartDate EndDate 1 1 2025-01-11 2025-01-16 2 2 2025-01-11 2025-01-16 3 3 2025-01-11 2025-01-16 4 4 2025-01-11 2025-01-16 5 5 2025-01-11 2025-01-16 6 6 2025-01-11 2025-01-16 7 7 2025-01-11 2025-01-16 8 8 2025-01-11 2025-01-16 9 9 2025-01-11 2025-01-16 10 10 2025-01-11 2025-01-16The docs for DBCC CHECKIDENT say this if I run with only the table parameter: "If the current identity value for a table is less than the maximum identity value stored in the identity column, it is reset using the maximum value in the identity column. " I run this code:
DELETE dbo.TravelLog WHERE TravelLogID >= 9
GO
DBCC CHECKIDENT(TravelLog, RESEED)
GO
INSERT dbo.TravelLog
(
CityID,
StartDate,
EndDate
)
VALUES
(4, '2025-09-14', '2025-09-17')
GO
What is the identity value for the new row inserted by the insert statement above? See possible answers