We receive a bunch of CSV files from our customers, import them, and transform the data. UNPIVOT in Oracle. The PIVOT and UNPIVOT are relational operators used to change a … ... (PIVOT), or from columns to rows (UNPIVOT). UNPIVOT, on the other hand, is used to carry out the opposite operations. PostgreSQL doesn't support this syntax or functionality, but we can easily get the same result. In a query, it is specified in the … Oracle has an UNPIVOT directive, which transposes columns into rows. The SQL standard and the awesome PostgreSQL database offer an even more convenient syntax for the above functionality. Converting Columns To Rows (UNPIVOT) Unpivot works in a similar way to pivot. In this Unpivot example, we will convert the Column names (2011, 12, 13, and 2014) into Row values using a built-in operator called Unpivot along with SQL IN Operator.. However, the Order Quantity rearranges a spermatozoon the Order Year. UNPIVOT operator does the opposite. The … PostgreSQL - transpose columns into rows. Browse other questions tagged postgresql-9.4 postgresql-9.5 unpivot or ask your own question. SQL Server - What is PIVOT and UNPIVOT? SQL UNPIVOT on Multiple Columns Some time ago I posted about using the UNPIVOT function in a stored procedure here. First, let's look at an example in Oracle. So, it is used to convert the columns of a specific table to column values. And you want to write SQL converting the gold, silver and bronze columns into rows? The result of that operation will yield the result shown in the following image. UNPIVOT in SQL Example. If there are fewer rows in a group than there are output value columns, the extra output columns are filled with nulls; if there are more rows, the extra input rows are skipped. If we ignore the GROUP BY for one moment, the value of the 4 columns will be either the value in the RESULTS column if the Quarter is equal to the Quarter in the CASE expression or it will be NULL if it doesn't match. In this query we scan the SALES table and return the Year followed by 4 other columns. After selecting the columns, right-click any of the selected columns, and then select Unpivot columns. ETL. In this SQL example, the Product Name column values will remain the same. Table containing a Country column set as the Text data type, an Attribute column set as the Text data type, and a Value column set as the Whole number data type. This results in more columns and few rows. - June 21, 2009 at 09:00 AM by Amit Satpute. Quite often we receive them in a human-readable format when a set of columns represents aggregate values over an organization. The Overflow Blog Tips to stay focused and finish your hobby project Suppose you have a number of columns in a wide table that you would like to unpivot into a single column and multiple rows. You need to supply three things: The name of a new column that will store the values from the old columns; Another new column showing the source of these values We will create a table with some simple sales data. UNPIVOT is a relational operator that accepts two columns (from a table or subquery), along with a list of columns, and generates a row for each column specified in the list. Recently I came across an interesting problem that required further use of the UNPIVOT command. It is used to rotate the rows to column values and runs aggregations when required on the remaining column values. It converts column based data to rows. We will record the department year and sales amount for each quarter. It's time for the unpivot! UNPIVOT¶ Rotates a table by transforming columns into rows. 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