Simple interest in SQL Server is principal times rate times years divided by 100, and a T-SQL function returns it in one line. This post shows how an int return type drops the cents and what SCHEMABINDING changes. It measures the cost of a scalar function on 500,000 rows and ends with compound interest.
SQL SERVER – Difference Between Count and Count_Big
The difference between Count and COUNT_BIG includes result range and indexed-view requirements. Their row-counting rules are the same.
Logon Storms: Protecting SQL Server From Connection Floods
Diagnose SQL Server logon storms, control connection growth, test a limited logon trigger, and preserve administrator recovery access.
Searching the Error Log by Date and Text With xp_readerrorlog
Search the SQL Server error log by date and text, select archives, capture matching rows, and cycle logs without losing context.
Change Join Type for a Query: HASH, LOOP and MERGE Hints
To change join type for a query, add one of three hints to its OPTION clause. This post runs one join with each hint on two filters and compares the join type and the logical reads. It shows that no join type is best in general, and what a join hint in the FROM clause does to the join order.
Line Endings: CHAR(13), CHAR(10) and Files From Other Systems
Why does a value that looks perfect fail a compare? Because of a line ending you cannot see. Five small demos make it visible.
SQL SERVER – Change Password at the First Login
MUST_CHANGE requires a SQL-authenticated login to change password at its first connection. Policy options and the client workflow must support it.