SELECT * Does Not Hurt Performance
I read all the time how SELECT * hurts performance. I even see where people have said that you just have...
2016-10-25 (first published: 2016-10-17)
4,415 reads
I read all the time how SELECT * hurts performance. I even see where people have said that you just have...
2016-10-25 (first published: 2016-10-17)
4,415 reads
The things you read on the internet, for example, “don’t use a sub-query because that hurts performance.”
Truly?
Where do people get...
2016-10-24
1,522 reads
This is post #10 supporting Tim Ford’s (b|t) initiative on #iwanttohelp, #entrylevel. Read about it here.
When you send a query to your...
2016-10-19 (first published: 2016-10-10)
2,077 reads
SQL Server is a deep and complex product. There’s always more to learn. For example, I had never heard of...
2016-10-13 (first published: 2016-10-03)
1,796 reads
Busy, busy, busy.
A lot of the work around PASS currently is getting ready for Summit. I’m prepping my part in the...
2016-10-11
441 reads
When working with SQL Server, many people don't need the search engine to be their junior DBA, they need it to be their senior DBA.
2016-10-10
153 reads
Here’s a great question I received: We had a problem at 9:02 AM this morning, but we’re not sure what...
2016-10-06 (first published: 2016-09-26)
1,861 reads
No one reads blogs any more.
Twitter is dying.
Facebook is broken.
LinkedIn? Please.
G+. Is that even on any more?
Where do we go...
2016-10-05
478 reads
A few months ago I created a GitHub repository for the purpose of building and maintaining a list of resources...
2016-09-30
849 reads
I was just asked how many times I’ve been to the PASS Summit. This year will be my 12th consecutive...
2016-09-29
762 reads
By Vinay Thakur
Continuing from Day 3 where we covered LLM models open/closed and their parameters, Today...
By Steve Jones
One of the nice things about Flyway Desktop is that it helps you manage...
By HeyMo0sh
Microsoft Fabric (not to be confused with the more general term “fabric” in DevOps)...
I'm fairly certain I know the answer to this from digging into it yesterday,...
Hi Team, I am trying to refresh the Azure Synapse Dedicated pool from production...
hi everyone I am not sure how to write the query that will produce...
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