2011-06-22
3,251 reads
T-SQL
2011-06-21
3,710 reads
Using a Variable for an IN Predicate
How to use a passed string variable for an IN type predicate in your queries as a way to more efficiently handle an array of strings.
2013-03-01 (first published: 2011-06-21)
26,723 reads
The 5 First SQL Errors to Check For
Is your SQL query crashing? Nine times out of ten it will be for one of these 5 reasons!
2011-06-14
13,301 reads
Returning 0's in a SUM (SQL Spackle)
Learn how you can sum data by hour and by day while showing 0 values in your result sets for those time periods without a sum in this short article by Patrick Cahill.
2024-10-25 (first published: 2011-06-13)
10,209 reads
3 SQL Join Concepts to Help You Choose the Right Join
What do SQL joins and the "teach a man to fish" Chinese proverb have in common? SQL joins, like regular expressions, are one of those commonplace programming tasks in which true success is entirely dependent upon your ability to conceptualize the outcome. Fail to do so and you'll likely wind up spending a few hours in a frustrating round of trial and error. Like regular expressions, the proliferation of online examples has actually contributed to the frustration, providing the equivalent of a day's worth of fish rather than the proverbial fishing pool.
2011-06-10
8,288 reads
2011-06-07
3,461 reads
TIME Gentlemen please! The SQL Server temporal datatypes
If you are still using the old Sybase DateTime datatype, it is a good idea to move your code to the more standard datatypes that were introduced in SQL Server 2008. Joe Celko explains why, and walks through some of the history of the TSQL way of storing and manipulating dates and times.
2011-05-25
3,801 reads
2011-05-24
3,046 reads
2011-05-17
3,174 reads
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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