SQL Server is a relational database management system that is used for storing and processing a large amount of data from different databases. Now, if you want to use the data stored in these databases then you will need SQL Server services. There are multiple ways we can do this.
In this article, we will mention about transferring data in SQL Server from csv file to database table as well as how to reverse csv file in sql server. We also provide one example of unpivot data from csv file to database table then back to csv file with sql server example all these processes in detail.
Unpivot In Sql Server With Example
In this tutorial, we will discuss how to unpivot data in Sql Server. PIVOT and UNPIVOT are used to convert data from one column to multiple columns or vice versa.
If you want to convert data from one column to multiple columns, then you can use PIVOT operator. If you want to convert data from multiple columns to one column, then you can use UNPIVOT operator.
In this tutorial, we will discuss both these operators with their example.
In this article, I am going to share with you the different ways to unpivot data in SQL Server.
In this article, I am going to share with you the different ways to unpivot data in SQL Server.
Pivot and Unpivot in SQL Server
The pivot and unpivot functions are used to convert rows into columns and vice versa. The pivot function is used to convert data from rows into columns while the unpivot function is used to convert data from columns into rows.
Pivoting Data
Before we start exploring more on pivoting, let’s understand what we mean by pivoting data. Pivoting data means converting it from row format into column format or vice versa. For example, if we have a table with multiple columns as shown below:
ID Name Age 1 John 30 2 Mary 25 3 David 40 4 Ann 16 5 James 24 6 Bill 45 7 Robert 60 8 Nina 68 9 Susan 32 10 Barbara 33 11 Joan 35 12 George 39 13 Catherine 21 14 Amy 26 15 Jane 27 16 Jessica 29 17 Bill 34 18 Frank
Pivot and unpivot are data transformation functions that work on the rows of a table, taking the values in one or more columns, and re-arranging them into multiple columns. SQL Server has a separate function, PIVOT, that is used to perform this operation.
In this article I will discuss various ways to use these functions, with examples in SQL Server. Let us start by looking at how we can use PIVOT and UNPIVOT in SQL Server.
SQL Server pivot is a data transformation operation performed on a table. It allows us to transform the rows and columns of a table into another set of rows and columns. SQL Server PIVOT operator is used for this purpose.
Both pivot and unpivot operators are used for data transformation, but they work in different ways. In this article, we will discuss these two operators with examples so that you can easily understand their differences.
SQL Server PIVOT Operator:
The SQL Server PIVOT operator is used to rotate the values of the specified column(s) around the specified value(s). The result contains multiple columns of aggregated values which are calculated based on the values in each row.
Let’s understand how it works with an example:
SELECT ProductName FROM Production.Product WHERE ProductSubcategoryID = 1 UNPIVOT (UnitPrice FOR Discount) AS A OUTPUT @Param1 = ‘Discount’, @Param2 = ‘Discount_Amount’
SQL Server Pivot and Unpivot :
SQL Server Pivot is a data transformation feature to transform a column of values into multiple columns.
Unpivot is the opposite of PIVOT, it transforms multiple columns into a single column.
SQL Server PIVOT Example:
PIVOT operator is used in SQL Server to transform the result set into different columns. The output of the following query will be three columns instead of one column in the result set.
SELECT CategoryID,SalesOrderID ,SUM(SalesAmount) AS Total FROM Sales.SalesOrderDetail WHERE ProductID IN (10,20) GROUP BY SalesOrderID;
To unpivot data, you must have a column or columns that contain values to be used as the new values. For example, you can use the following query to obtain a list of customers and their purchases:
Pivot in Sql Server
Pivot is a function which is used to change the position of data in a table. It is used to convert rows into columns or columns into rows. It is used for transformation of data from vertical format to horizontal format and vice versa.
Pivot can be done using different methods:
1) SQL Server PIVOT operator
2) SQL Server UNPIVOT operator
3) T-SQL PIVOT clause
In SQL Server;
SELECT CustomerID, PurchaseDate, PurchaseAmount FROM dbo.Purchases
The same data in an unpivoted format is shown below:
CustomerID PurchaseDate PurchaseAmount
1 10/01/2029 100
2 10/02/2029 500
3 10/03/2029 600
4 10/04/2029 800
5 10/05/2029 100.
Pivot and unpivot are great features in SQL Server. They allow you to do some cool tricks with your data, such as convert rows into columns and vice versa.
In this article, we’ll look at how you can use these functions to transform your data. We’ll start with a simple example, then move on to more complex scenarios.
You can use the PIVOT operator in SQL Server to convert rows into columns and vice versa.
The syntax is as follows:
SELECT column_name(s) FROM table_name PIVOT (aggregate_function(column_name(s)) FOR pivot_column IN (value_list));
You specify an aggregate function, followed by a list of values from which you want to pivot the result set. Then, for each value listed in the value list, you specify the column name from which you want to pivot the result set. For example:
–Pivot example 1 SELECT product_id AS productID , brand_name AS brandName , category_name AS categoryName FROM products PIVOT ( MAX ( unitPrice ) FOR brand IN ( ‘Honda’ , ‘Toyota’ ) ) AS unpiv.
Unpivot
In SQL Server, the function UNPIVOT can be used to convert columns into rows. This is useful when you need to rotate data from a table and know how many columns there will be.
The following example shows how to unpivot data in SQL Server. A table named Table1 has two columns, Name and Age. We are going to unpivot this table by converting Age column into a row.
First create an empty temporary table called TempTable1. Then we will use UNPIVOT function with two arguments, ‘SourceTableName’ and ‘ExpandColumns’. Next we’ll insert the data from Table1 into TempTable1 using INSERT statement. Finally we’ll delete TempTable1 and rename the original Table1 as Table2 by using CHANGE TABLE statement.