SQL ASCII Function Use and Examples
The ASCII function is used to return the ASCII value for the first character in a string.
2025-05-16
T-SQL
Evaluating the Randomness of SQL Server Random Number Functions
Microsoft provides T-SQL developers with three functions (rand, newid, and crypt_gen_random) for generating random numbers. Each of these functions is effective at returning random values, but feature sets associated with each function make them best suited to different use cases. This tip’s Solution section presents an overview of common use cases for random numbers in SQL Server along with references to learn more about random numbers in SQL Server.
2025-05-12
Date and Time Calculations Made Easy with EOMONTH, DATEDIFF, and DATEADD
Learn how to work with dates and calculate particular dates or elapsed time periods with some of the functions available in SQL Server.
2025-05-09
3,153 reads
2025-05-07
440 reads
SQL Server Cursor Example
I know SQL cursors exist, but I am not sure how or why to use them. Can you provide a SQL cursor example? Can you give any guidance on when to use a SQL Server cursor?
2025-05-07
Return stored procedure parameter values to a calling stored procedure
In a previous topic we discussed how to pass parameters into a stored procedure, but another option is to pass parameter values back out from a stored procedure. One option for this may be that you call another stored procedure that does not return any data, but returns parameter values to be used by the calling stored procedure.
2025-05-02
2025-04-23
412 reads
Using the CASE expression instead of dynamic SQL in SQL Server
I have a lot of SQL update queries where I need to make IF/ELSE types of decisions. In some cases, I am using a cursor but looping through thousands of rows for update takes a long time. I also use some dynamic SQL to handle some query parameter decision making. Is there a better alternative?
2025-04-23
The Subtle Differences Between COALESCE and ISNULL
See how ISNULL and COALESCE behave in different situations and ensure you know which one to pick when.
2025-04-18
5,101 reads
Elements of the SQL Server Update Statement
Learn how to use the UPDATE statement, along with a few things to be aware of when changing data.
2025-04-11
1,650 reads
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Question of the Day
Fun with JSON I
I have some data in a table:
CREATE TABLE #test_data
(
id INT PRIMARY KEY,
name VARCHAR(100),
birth_date DATE
);
-- Step 2: Insert rows
INSERT INTO #test_data
VALUES
(1, 'Olivia', '2025-01-05'),
(2, 'Emma', '2025-03-02'),
(3, 'Liam', '2025-11-15'),
(4, 'Noah', '2025-12-22');
If I run this query, how many rows are returned?
SELECT *
FROM OPENJSON(
(
SELECT t.* FROM #test_data AS t FOR JSON PATH
)
) t; See possible answers