ChrisM@Work

Forum Replies Created

Viewing 15 posts - 526 through 540 (of 10,143 total)

RE: Nearest Date value

ansaryarshad - Tuesday, October 31, 2017 5:25 AM
ChrisM@Work - Tuesday, October 31, 2017 2:50 AM
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 31, 2017 at 6:16 am

#1965947
RE: How to find the first recurring character of a string.

John Mitchell-245523 - Tuesday, October 31, 2017 4:16 AM
Chris
Good spot. I saw that when I looked in the execution plan. What still...
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 31, 2017 at 4:27 am

#1965922
RE: How to find the first recurring character of a string.

John Mitchell-245523 - Monday, October 30, 2017 10:38 AM
Goodness, yes - I tried it with an on-the-fly table. Mine slowed down significantly...
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 31, 2017 at 3:38 am

#1965918
RE: Nearest Date value

This is a bogstandard SQL version of the APPLY query I posted above. One of the many handy features of APPLY is that the subqueries can often by transposed directly...
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 31, 2017 at 2:50 am

#1965912
RE: Nearest Date value

Here's a version using a subquery:
use tempdb;
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 11:32 am

#1965826
RE: Join on a Substring

Lynn Pettis - Monday, October 30, 2017 10:43 AM
jjf410 - Monday, October 30, 2017 10:36 AM
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 11:17 am

#1965824
RE: How to find the first recurring character of a string.

John Mitchell-245523 - Monday, October 30, 2017 10:38 AM
Goodness, yes - I tried it with an on-the-fly table. Mine slowed down significantly...
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 10:46 am

#1965816
RE: How to find the first recurring character of a string.

Interesting - if you use a tally table derived from sys.objects then John's query is fastest. If you use a hard tally table then mine is fastest (though not by...
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 10:17 am

#1965809
RE: How to find the first recurring character of a string.

John Mitchell-245523 - Monday, October 30, 2017 9:50 AM
Chris
Yes, you appear to have changed my PARTITION BY clauses. The first one should...
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 9:56 am

#1965805
RE: How to find the first recurring character of a string.

John, you're absolutely correct, your code runs about twice as fast as mine. It does, however, generate some strange results, and I've messed with it a bit so that could...
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 9:14 am

#1965793
RE: How to find the first recurring character of a string.

TheCTEGuy - Monday, October 30, 2017 6:35 AM
ChrisM@Work - Monday, October 30, 2017 6:30 AM
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 7:17 am

#1965759
RE: How to find the first recurring character of a string.

Here's a compact alternative:
DECLARE @str
^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 6:30 am

#1965750

RE: Error in t-SQL code

Using PRINT instead of EXEC helps debugging these pesky dynamic sql errors:
DECLARE
@DB as varchar(50) = 'dwhCore_Prod',
@SPName Varchar (200) = '[GenericData] - [uspLoadhsatPositionFromPosition]',
@StartDate date...

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

October 30, 2017 at 3:13 am

#1965735

RE: Trying to speed up this 'GetWorkingDays' function.

Jeff Moden - Thursday, October 26, 2017 8:53 AM

lars.hesselberg 49028 - Tuesday, October 24, 2017 8:30 AM

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

October 26, 2017 at 8:59 am

#1965327

RE: Where query time between 6am and 6pm

Have you checked that the inner query is working correctly?

SELECT InterfaceID

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

October 26, 2017 at 7:09 am

#1965293

Viewing 15 posts - 526 through 540 (of 10,143 total)