assuming a 1-1 ratio. But you can use an aggregate function as well to string stuff together if there's more than one entry per column per group/id.
Example Orders table to transform using PIVOT operator. Image by Author. I will use the PIVOT operator to aggregate the data so that each year's total sales_revenue is shown in columns. -- Use PIVOT to aggregate sales revenue by year SELECT * FROM ( -- Select the relevant columns from ...
last_pivoted_columnAScolumn_nameFROM(SELECTquery that producesdata)ASalias_for_selectPIVOT(aggregate_function(aggregate_column)FOR[column_with_header_values]IN(first_pivoted_column,… last_pivoted_column))ASalias_for_pivot_table; There is a lot here. Let’s explain it: non_pivoted_column: This ...
如果只有一个aggregate_expression,则使用column_alias命名该列。 否则,使用column_alias_agg_column_alias命名。 每个单元格中的值是使用aggregation_expression的FILTER ( WHERE column_list IN (expression, ...)的结果。 示例 SQL复制 -- A very basic PIVOT-- Given a table with sales by quarter, return ...
SQL is a statically typed language: the query must list the result columns upfront. To pivot a table with unknown or dynamic attributes, multisets or document types (XML, JSON) can be used to represent a key-value store in a single column. See conforming alternatives to listagg: document ...
Transposing Columns into Rows with UNPIVOT A Simple UNPIVOT Example Handling NULL Values in UNPIVOT Aliases and UNPIVOT Can You Use Oracle PIVOT Without an Aggregate? Now let’s get into the guide! The Problem Let’s say you’ve got this set of data in a table called cust_sales: ...
pivot_column = CONVERT(<data type of pivot_column>, 'output_column') aggregate_function 的評估對象為此子群組上的 value_column,且其結果是作為相對應 output_column.的值來傳回。 如果子群組是空的,SQL Server 會為該 output_column 產生null 值。 如果彙總函式是 COUNT,且子群組是空的,就會傳回零 ...
aggregate_function 接受一个或多个输入的系统聚合函数或用户定义聚合函数。 聚合函数应该对 Null 值固定不变。 对 null 值固定不变的聚合函数在求聚合值时不考虑组中的 null 值。 不允许使用 COUNT(*) 系统聚合函数。 value_column PIVOT 运算符的值列。 与 UNPIVOT 一起使用时,value_column 不能是输入 table...
Transact-SQL reference for PIVOT and UNPIVOT relational operators. Use these operators on SELECT statements to change a table-valued expression into another table.
CLR database objects are executed with version 4 of the CLR. The XQuery functions string-length and substring count each surrogate as two characters. The XQuery functions string-length and substring count each surrogate as one character. PIVOT is allowed in a recursive common table expression (CTE...