Comments Feed

Puzzle Me This: String Replacement Commented on: 20 weeks ago (April 10, 2015)

Here is my take at it.

DECLARE @Keyword NVARCHAR(1000) = N'wwAMxxAMyyAMzz',
@Source NVARCHAR(1000) = N'AM',
@Synonym NVARCHAR(1000) = N'AN';

DECLARE @Permutations INT...

Find a Minimum Missing Value Commented on: 41 weeks ago (November 14, 2014)

Slightly less cost. Reduce the WHERE clause like this

WITH C AS
(
SELECT col1, LEAD(col1, 1, 0) OVER(ORDER BY col1) AS nxt
FROM dbo.T1
)
SELECT TOP (1)...

Identifying a Subsequence in a Sequence, Part 3 Commented on: 1 year ago (July 15, 2014)

Thank you Itzik for this excellent walk-through!

Identifying a Subsequence in a Sequence, Part 1 Commented on: 1 year ago (February 6, 2014)

See my set-based solution in second part of this article.
1.5 seconds and 14 000 reads.

Identifying a Subsequence in a Sequence, Part 2 Commented on: 1 year ago (February 6, 2014)

Hi Itzik.

The problem is just another Relational Division; Ordered Relational Division. My solution finishes in just 1.5 seconds and uses about 14000 reads.

DECLARE @Items INT = (...

What's a good use for a UNIQUE filtered index? Commented on: 3 years ago (November 21, 2011) I use it to enforce data integrity in our data warehouse. Currently there are two business systems feeding the DW with data, and some tables (like Orders.SalesDetail) containts data from both systems...
Use T-SQL to Generate a Sequence Commented on: 4 years ago (August 22, 2011) Itzik, let me know if you got my script by email. //Peter
Solutions to TSQL Challenge – Reoccurring Visits Commented on: 4 years ago (July 14, 2011) Not bad Mr Celko. Not bad at all. It's clever to build a "dual date" cte holding yesterday's and today's dates. Add "sum(today_flg) as NumVisits," to the final output...
TSQL Challenge – Reoccurring Visits Commented on: 4 years ago (July 6, 2011) Here is my stats with 100,000+ row sample data using same date interval as original (8 row(s) affected) Table 'Worktable'. Scan count 0, logical reads 0. Table 'DailyVisits'. Scan...
Solutions to Packing Date and Time Intervals Puzzle Commented on: 4 years ago (March 25, 2011) Where is my #3? ;-)

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