SELECT COUNT(*) vs COUNT(1) vs COUNT(ColumnName)
What is the difference between COUNT(*), COUNT(1) and COUNT(ColumnName)? A mystery that will never be known… ok that was a...
2011-09-15
13,149 reads
What is the difference between COUNT(*), COUNT(1) and COUNT(ColumnName)? A mystery that will never be known… ok that was a...
2011-09-15
13,149 reads
Those who know me will know that this post is a little out of the ordinary… I am posting about...
2011-08-12
3,852 reads
I’ll be honest, I am partially writing this because I always forget how to reset the identity column on a...
2011-08-11
1,322 reads
First of all if you came out to my webinar this morning let me say a huge thank you! I...
2011-08-10
634 reads
Tomorrow I will be presenting a webinar at 11 AM eastern time for the Pragmatic Works Training on the T’s. ...
2011-08-08
901 reads
SQL Saturday in South Florida is quickly approaching in just 2 short weeks. As usual, if you are in the...
2011-08-03
649 reads
Oh no you, you got the Could not load type ‘Microsoft.AnalysisServices.SharePoint.Integration.ReportGalleryView’ error!!! What to do now? Why did you get...
2011-08-02
1,061 reads
SQL Saturday #85 is quickly approaching. It will be held in sunny Orlando, FL so if you live in the...
2011-07-30
2,054 reads
One of the most annoying processes with SharePoint is backing up a site collection. There is a build in tool...
2011-07-13
1,879 reads
It has been a few weeks since I last posted. I know, I’m a slacker, thanks for pointing that out. ...
2011-07-10
390 reads
By Brian Kelley
I will be leading an in-person Certified Information Systems Auditor (CISA) exam prep class...
EightKB is back again for 2026! The biggest online SQL Server internals conference is...
By HeyMo0sh
Working in DevOps long enough teaches you two universal truths: That’s exactly why I...
Hi all, I just started using VS Code to work with DB projects. I...
Comments posted to this topic are about the item Fun with JSON II
Comments posted to this topic are about the item Changing Data Types
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 t1.[key] AS row,
t2.*
FROM OPENJSON(
(
SELECT t.* FROM #test_data AS t FOR JSON PATH
)
) t1
CROSS APPLY OPENJSON(t1.value) t2; See possible answers