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SQL Server Dirty Reads in concurrent transactions
SQL Server Dirty Reads problems in concurrent transactions
SQL Server LAST_VALUE function
SQL Server LAST_VALUE function is a Analytic function which returns the Last value in an ordered set of values.
SQL Server Composite key
SQL Server Primary key is used to uniquely identify each rows in the table but sometimes more than one column are used to uniquely identify each rows in the table.
Print Prime numbers for any given n number in SQL Server
Print a prime numbers separted by comma for any given number .
For example, the prime number for 10 , wolud be 2,3,5,7 .
Here is the query:
SQL Server Dynamic PIVOT
SQL server allows us to transform a row- level data into columnar data using SQL Pivot.
SQL CLUSTERED INDEX
SQL Server Clustered index
A clustered index defines the order in which data is physically stored in a table. A table can have only one clustered index because data rows can be only sorted in one order.
SQL Server TEMPORAL TABLE
SQL Server Temporal tables (system-versioned tables) allow us to track data changes. It was introduced in SQL Server 2016.
It allows SQL Server to maintain and manage the history of the data in the table automatically, So we can get all information about the data that was stored at any specified time rather than just the data that is current.
SQL Server WHILE
SQL Server WHILE loop sets a condition for the repeated execution of an SQL statement or statement block.
SQL Server UNPIVOT
SQL Server UNPIVOT allow us to transform columns of a table-valued expression into column values that is rotating columns into rows.
It performs a reverse operation of SQL Server PIVOT.
SYNTAX
SELECT …
FROM …
UNPIVOT (
FOR
[ … ]
SQL Server FOR JSON Clause
SQL Server FOR JSON Clause
SQL Server FOR JSON Clause is used to format query result to JSON format or export data from SQL Server as JSON format. It was introduced in SQL Server 2016 version.
Enable Dark theme in SQL Server Management studio
How to get dark theme for SQL Server Management studio?
By default it is hidden in SQL Server management studio, you can quickly check by following below steps.
SQL Server NCHAR
NCHAR data type is used to store Unicode string data of fixed-length.
NCHAR data type is used to store Unicode string data of fixed-length.
It stores data at 2 byte per character.
It supports up to 4000 characters.
SQL SERVER NVARCHAR
SQL Server NVARCHAR is used to store uniqcode string data of variable length, it can store both unicode and non unicode strings.
SQL SERVER VARCHAR
SQL Server VARCHAR Data Type is used to store non-unicode string data of varaible length.
Generate calendar table in SQL Server
How to Display calendar dates for any n numbers of years in SQL Server?