Tally Tables in T-SQL
The Tally (or Numbers) table is one of the most useful constructs in intermediate-level SQL. Have you ever written a...
2014-03-27
56,480 reads
Dwain Camps
Getting an INDEX SEEK to Speed up LIKE “%string%” Searches
In today’s blog I will attempt to challenge the popularly held notion that LIKE “%string%” wildcard searches must be slow...
2014-03-26
20,689 reads
Common Table Expressions in SQL
In SQL Server 2005, Microsoft introduced the Common Table Expression (CTE). CTEs share similarities with VIEWS and derived tables, but...
2014-03-23
1,603 reads
The T-SQL ROW_NUMBER() Function
If you learn one new T-SQL (i.e., Microsoft SQL Server) concept today it should be ROW_NUMBER(). Introduced in SQL 2005,...
2014-03-22
2,962 reads
Creating a Date Range from Multiple Rows Based on a Single Date
When you've got only a single effective date on a record and you need to artificially create the effective end date based on a following row in T-SQL, the techniques discussed in this article will help you decide what is best.
2014-03-18
33,660 reads
The SQL TABLE Type: Beyond Table-Valued Parameters
Follow along as this starter article on the SQL TABLE Type walks you through the various ways it can be used in T-SQL.
2014-03-03
10,002 reads
2014-01-09
2,342 reads
Variable Default Values to a Stored Procedure (SQL Spackle)
A way to assign variable and overrideable defaults to input parameters to an SP or FUNCTION using a configurations table.
2013-09-03
8,356 reads
2013-09-03
2,456 reads
A Hazard of Using the SQL Merge Statement
The SQL MERGE statement can make your DML querying more efficient but you need to take care or you may get burned
2013-04-03
24,548 reads
Blogs
AI: Blog a Day – Day 4: Transformers – Encoder, Decoder, and Attention
By Vinay Thakur
Continuing from Day 3 where we covered LLM models open/closed and their parameters, Today...
Flyway Tips: Multiple Projects
By Steve Jones
One of the nice things about Flyway Desktop is that it helps you manage...
What DevOps Look Like in Microsoft Fabric
By HeyMo0sh
Microsoft Fabric (not to be confused with the more general term “fabric” in DevOps)...
Forums
Can an Azure App Service Managed Identity be used for SQL Login?
I'm fairly certain I know the answer to this from digging into it yesterday,...
Azure Synapse database refresh
Hi Team, I am trying to refresh the Azure Synapse Dedicated pool from production...
how to write this query?
hi everyone I am not sure how to write the query that will produce...
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