Replace correlated subqueries with windowed counts, dates, and running totals, preserve detail rows, and keep useful EXISTS filters.
CONCAT and NULL – SQL in Sixty Seconds #123
I have decided to convert the blog into the video of SQL in the Sixty Seconds. Let us learn about CONCAT and NULL – SQL in Sixty Seconds #123.
SQL SERVER – NULL Values and CONCAT Function
A lot of SQL in the Sixty Seconds video recently, we will be looking at a very interesting T-SQL CONCAT function and how it works with the NULL Values.
TSQL_SCALAR_UDF_INLINING: How to Disable Scalar UDF Inlining
TSQL_SCALAR_UDF_INLINING is the database scoped setting that switches scalar UDF inlining off. This post builds a demo database, proves with execution counts that inlining is on or off, and shows the narrower switches at function and query level. It ends with the undo statement.
Day Name From Date in SQL Server: DATENAME, FORMAT and More
Finding the day name from date values takes one function, but three methods exist, and they differ on language and speed. This post compares DATENAME, FORMAT and a formula that ignores language and DATEFIRST. It measures all three on a million rows and shows how the session language changes the result.
How to Combine Time and Date in SQL SERVER? – Interview Question of the Week #285
Question: How to Combine Time and Date in SQL SERVER?
Answer: A very simple and popular question. Let us learn together.
Year-Over-Year Comparisons in One Query
Build year-over-year monthly comparisons with a complete calendar, LAG, date-aligned joins, safe percentages, and missing-period rules.