SQL & BI

Blog Post

RANKING Function in plain SQL

Below examples will show that we can still write a pure sql query for RANK, DENSE_RANK and ROW_NUMBER without using RANK() function.DECLARE @StudentScore TABLE(StudentName VARCHAR(1),StudentScore INT)INSERT  @StudentScore VALUES ('A',85),...

2012-06-11

53 reads

SQL Azure Federation

 What is Federation?

Federation is a database object like other objects such as tables, views, stored procedures or triggers.
It is also known as Sharding.
There can be multiple federations in a database.
It is...

2012-04-25

384 reads

Blog Post

SQL Azure Federation

 What is Federation?
Federation is a database object like other objects such as tables, views, stored procedures or triggers.It is also known as...

2012-04-25

838 reads

Blog Post

CONCAT in SQL 2012

SQL Server 2012 introduces a brand new string function called CONCAT(). CONCAT() string function allows you to concatenate up to 255 string or variable values in to one single...

2012-04-20

80 reads

Blog Post

CONCAT in SQL 2012

SQL Server 2012 introduces a brand new string function called CONCAT(). CONCAT() string function allows you to concatenate up to...

2012-04-19

464 reads

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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;
 

See possible answers