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2d
comment What is better? Delete and insert or update?
Any triggers for update on the table?
Jul
25
comment How do I place leading zeros for numbers less than 10 without affecting those 10+?
Agree with @ypercube. You could change the first comparison to MyColumn < 10 but that might break as we don't know if MyColumn is guaranteed to ever contain only numbers.
Jul
25
comment SQL Server - constraint to prevent overlapping dates
In response to the earlier comment of yours where you are giving an example of INSERT that doesn't work, that INSERT doesn't populate a PreviousFinished value, which it must according to the method in the linked answer.
Jul
25
comment SQL Server - constraint to prevent overlapping dates
Or perhaps you are struggling to understand how the method in the answer to the linked question works?
Jul
25
comment SQL Server - constraint to prevent overlapping dates
Regarding your update, I don't really understand the actual problem you are facing. Is this about your table already having ranges that overlap and you wanting to detect and resolve them?
Jul
23
comment SQL Server - constraint to prevent overlapping dates
That's great news, people will come here and immediately see that this question already has an answer. :)
Jul
23
comment What is the correct way to ensure unique entries in a temporal database design?
How would you go about splitting an existing (closed) range into two with this restriction implemented? Doesn't seem possible to me, but I might be missing something. (However, it certainly seems possible with the other variation, the one that allows gaps.)
Jul
23
comment How do I include nulls during comparisons in SQL Server?
CASE value WHEN 26 THEN 1 ELSE 0 END = 0. Beautiful, ever so intuitive and by all means sanest of ways.</sarcasm>
Jul
14
comment Getting unique names when the IDs are different (DISTINCT ?)
+1, although deriving a table appears to be perfectly unnecessary.
Jun
18
comment SQL2542N - No match for a database image file was found based on the source database alias
Does it matter that you are running the command from the /data/home/db2inst1 directory while the file you say is located in /home/db2inst1?
Jun
18
comment T-SQL Calculate average value for Duration Field
Strangely, thanks to you I've just discovered that DATEDIFF(SECOND, '00:00:00', Duration) is actually slower than your original suggestion, but replacing the '00:00:00' (a string) with a 0 (an integer) did make it faster (than your method). Don't know why we've got different conclusions. (If this matters, I didn't use a table in my tests, because I only wanted to test the expressions, so I assigned same expression to a variable in a loop and measured the time.)
Jun
18
comment T-SQL Calculate average value for Duration Field
You could just get the difference in seconds between '00:00:00' and Duration instead of all the string manipulations.
Jun
6
comment Why can't I use a CASE statement to see if a column exists and not SELECT from it?
@MarkSinkinson: Names are checked after the syntax, but yes, SQL Server does that prior to actually running the batch.
Jun
5
comment Count where two or more columns in a row are over a certain value [basketball, double double, triple double]
TIL: PostgreSQL, like MySQL, permits referencing columns in GROUP BY by aliases or ordinal numbers.
May
30
comment MySQL stores 0.00 as 0?
Do you want it displayed as 0.00? Formatting should be done in the application.
May
23
comment How to Handle TimeZone Properly in SQL SERVER?
Such a toolkit would seem to be a great help for a developer. However, a scalar function is a black box to the query optimiser. It means that when I apply your function to a column, the configuration tables you are mentioning will be hit as many times as there are rows in the result set (assuming I use the function in the SELECT clause only). That doesn't seem a nice perspective in terms of performance. I haven't really tested your toolkit, though, so I can't say for sure, that's just a general concern based on what I know.
May
22
comment How can I minimize the risk of accidentally modifying the wrong database?
You mean that would somehow disable access to more than one server from a single SSMS instance? Or what have I missed?
May
15
comment How to find duration in a dataset
You are defining two identical subselects here. This is where using a CTE is helpful, because you can define your subselect as a CTE once and reference it multiple times (just like a view, except it is accessible in a single statement only). Here's one more example for you, this one illustrating how a CTE is re-used.
May
14
comment What is the strategy of query evaluation in DBMS when Limit is used in query?
I believe the point @ypercube is trying to make is that you are mixing groups, pages, likes in the same column, even though they are absolutely different entities. That is what makes no sense.
May
12
comment Get streak count and streak type from win-loss-tie data
Thank you for the clarification. I'm beginning to wish I hadn't upvoted your answer 20 min ago, because upvoting it now would have given me much greater satisfaction.