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.
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Pradeep Raturi
I have 11+ years of working experience in Business Intelligence Data Modelling, Power BI, SQL Server, SSRS, SSIS, Azure Data Factory, Power Apps.
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:
Get the Students who scored higher than 80 Marks
Query to Get the Students who scored higher than 80 Marks ?
DATE function DAX
DATE is a power bi Date and Time Function which returns the date in specified datetime format.
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.
How to get all tables those are having a primary key
How to get all the tables in database those are having primary key constraints ?
COUNT FUNCTION DAX
The COUNT function is a power bi DAX statistica function which counts the number of rows in a table.
It returns a single interger value.
SWITCH FUNCTION DAX
SWITCH() Function is a power bi dax logical function which evaluates an expression against a list of values and returns different results depending on the value of an expression.
It returns a scalar value of any type.
IF Function DAX
IF function is a Power BI logical function in DAX that checks whether a condition is satisfied, and returns one value in case of TRUE else another value in case of FALSE.
SUM() Function DAX
SUM() function is a power bi dax math function that adds up all the values in a single column that you specify after applying all filters.
SUMX Function DAX
SUMX() is a power bi DAX Math function that returns the sum of an expression evaluated for each row in a table. It returns a decimal number.
It goes through a table, row by row to complete the evaluation after filter is applied.
Only the numbers in the column are counted. Blanks, logical values, and text are ignored.
It can be used to evaluate expression over multiple columns as it has the ability to work row by row.
CALCULATETABLE function DAX
CALCULATETABLE function is a power bi filter function in DAX that evaluates a table expression in a context modified by the given filters. It returns a table of values.
DAX SYNTAX
CALCULATETABLE(
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 IF..ELSE
SQL Server IF..ELSE block is a control-of-flow that allows you to execute or skip a statement block based on a specified condition.
SYNTAX
IF Boolean_expression
{ sql_statement | statement_block }
[ ELSE { sql_statement | statement_block } ]
SYNTAX
IF Boolean_expression
{ sql_statement | statement_block }
[ ELSE { sql_statement | statement_block } ]
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.
SQL Server Stored Procedures Vs User Defined Functions
What is the difference between SQL Server Stored Procedures and User Defined Functions (UDF)?
Following are the some major difference between Stored procedures and User Defined functions
Return a value
Stored procedure may or may not return a value while UDF function must return a value.
