Will Assaf


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SQLSaturday Houston!

Thanks for joining me for a full room and a boatload of quick-delivered SQL 2017 information in the second timeslot today at SQLSaturday Houston 2018! Lots of great questions,...

2018-06-23

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Blog Post

SQLSat Houston This Weekend!

The wife and I are making the road trip this weekend to SQLSat Houston and we're both speaking!This SQLSaturday Houston is going to be great - looking forward to...

2018-06-19

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See you at SQLSat Dallas!

Looking forward to making the road trip on Friday and joining the #SQLFamily at SQLSat Dallas 2018 this Saturday. It's my first SQLSat Dallas since my last trip to...

2018-05-16

3 reads

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Refactoring SQL Code

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Refactoring SQL Code, which is...

The Read Committed Snapshot Isolation behaviour

By Alessandro Mortola

Comments posted to this topic are about the item The Read Committed Snapshot Isolation...

Working with JSON/JSONB Data in PostgreSQL using Python

By sabyda

Comments posted to this topic are about the item Working with JSON/JSONB Data in...

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Question of the Day

The Read Committed Snapshot Isolation behaviour

I am currently working with Sql Server 2022 and AdventureWorks database. First of all, let's set the "Read Committed Snapshot" to ON:

use master;
go

alter database AdventureWorks set read_committed_snapshot on with no_wait;
go
Then, from Session 1, I execute the following code:
--Session 1
use AdventureWorks;
go

create table ##t1 (id int, f1 varchar(10));
go

insert into ##t1 values (1, 'A');
From another session, called Session 2, I open a transaction and execute the following update:
--Session 2
use AdventureWorks;
go

begin tran;
update ##t1 
set f1 = 'B'
where id = 1;
Now, going back to Session 1, what happens if I execute this statement?
--Session 1
select f1
from ##t1
where id = 1;
 

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