
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.
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SQL Server LAST_VALUE function is a Analytic function which returns the Last value in an ordered set of values.
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SQL Server FIRST_VALUE function is a Analytic function which returns the first value in an ordered set of values.
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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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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:
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Query to Get the Students who scored higher than 80 Marks ?
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DATE is a power bi Date and Time Function which returns the date in specified datetime format.
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SQL server allows us to transform a row- level data into columnar data using SQL Pivot.
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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.
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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.
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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.
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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.
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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.
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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.
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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(
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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.
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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 } ]
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SQL Server WHILE loop sets a condition for the repeated execution of an SQL statement or statement block.
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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
[ … ]
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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.
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