Quantifier predicates
Predicates in SQL are often complex and difficult to understand. In this article, Joe Celko explains the logic behind a few of the predicates: EXISTS, SOME, ANY and ALL.
2022-01-14
T-SQL
Performance Tuning Using Free Tools, Part 2
You can do essential performance tuning on your SQL Server databases using a FREE toolkit!
2022-01-14
5,491 reads
How to Create a FOR Loop in SQL Server
Learn different ways to create FOR Loops using T-SQL such as using WHILE loops, cursors, tally tables and more.
2021-12-31
BETWEEN the two of us
BETWEEN can be used in a SQL WHERE clause to filter on a range. Joe Celko explains the history of BETWEEN and also could be implemented.
2021-12-15
Trusting STRING_SPLIT() order in Azure SQL Database
Learn about the changes to the STRING_SPLIT function in Azure SQL Database that allows you to specify ordinal position of the output.
2021-12-03
SQLFacts - A Free Toolkit for SQL Server Database Engineers
SQLFacts is a FREE suite of 26 (and counting) tools for SQL Server database development, database administration, and performance tuning. The toolkit is all T-SQL code and it includes the functionality of hundreds of short scripts.
2021-11-19
9,848 reads
Handling an unknown number of parameters in SQL Server
In this article we compare performance differences when splitting comma separated strings using TVPs, TVFs, openjson, string_split and more.
2021-11-10
Model and Log Trend Reversals for Time Series Data in SQL Server
This tip demonstrates models for detecting the start of periods of rising or falling financial securities prices based on exponential moving averages. The demonstration is simplified because it relies on a log to keep track of time series values as well as exponential moving averages with different period lengths.
2021-10-15
Learning the SQL GROUP BY Clause
Learn about the various ways to use the GROUP BY command to summarize and rollup query results. We look at the basics with examples as well as using group by rollup, cube and grouping sets.
2021-10-06
How LAG compares to other techniques
LAG pulls a column from another row without a self-join. In this article, Kathi Kellenberger shows how LAG compares to other techniques
2021-09-24
Blogs
SQL Server Wait Stats
By Kevin3NF
Everything in SQL Server is waiting for something…this is by design. And most people...
FabCon 2025 Recap
By DataOnWheels
Hey fellow data friends! Wow, March was an absolutely crazy month (in the best...
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Forums
why cant i get rid of extra dataset
hi i never used shared datasets before in ssrs. i created a dataset called...
Distinct values using string_agg
Hi Is it possible to get distinct values using string_agg Select T1."transType", WHEN T1."TransType"...
Refactoring a DELETE query using NOT EXISTS — need expert feedback
Hi everyone, I'm working on optimizing a DELETE query used in a data cleanup...
Question of the Day
Importing Flat Files
What types of sources can be used with the Import Flat File Wizard in SQL Server Management Studio (SSMS)?
See possible answers