When to use pivot and UNPIVOT in SQL Server?
APPLIES TO: SQL Server Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse. You can use the PIVOT and UNPIVOT relational operators to change a table-valued expression into another table. PIVOT rotates a table-valued expression by turning the unique values from one column in the expression into multiple columns in the output.
Which is the reverse of a pivot table?
Unpivot table:- Unpivot table is reverse of Pivot table as it rotate the columns of a table into the value of a column. For example, suppose we have a table say tbl_stdmarksdata whose structure us given below:-
Why does UNPIVOT not reproduce the original table value?
UNPIVOT doesn’t reproduce the original table-valued expression result because rows have been merged. Also, null values in the input of UNPIVOT disappear in the output. When the values disappear, it shows that there may have been original null values in the input before the PIVOT operation.
What are the column identifiers in UNPIVOT in SQL?
The column identifiers in the UNPIVOT clause follow the catalog collation. For SQL Database, the collation is always SQL_Latin1_General_CP1_CI_AS. For SQL Server partially contained databases, the collation is always Latin1_General_100_CI_AS_KS_WS_SC.
Which is the correct syntax for pivot in SQL?
The syntax for PIVOT provides is simpler and more readable than the syntax that may otherwise be specified in a complex series of SELECT…CASE statements. For a complete description of the syntax for PIVOT, see FROM (Transact-SQL). The following syntax summarizes how to use the PIVOT operator.
Where to find pivot view in SQL Server?
The Sales.vSalesPersonSalesByFiscalYears view in the AdventureWorks2012 sample database uses PIVOT to return the total sales for each salesperson, for each fiscal year. To script the view in SQL Server Management Studio, in Object Explorer, locate the view under the Views folder for the AdventureWorks2012 database.
Which is the reverse operation of pivot and UNPIVOT?
UNPIVOT carries out almost the reverse operation of PIVOT, by rotating columns into rows. Suppose the table produced in the previous example is stored in the database as pvt, and you want to rotate the column identifiers Emp1, Emp2, Emp3, Emp4, and Emp5 into row values that correspond to a particular vendor.