我希望转换Table1中的数据,如Pivot_table中数据的第一张图片所示。下面你可以看到Mysql中用于动态数据透视表的脚本,但我想在Postgresql中知道类似或合适的解决方案,如果可能的话?
Table1:
PK Name Subject Grade**
-------------------------------------
1 Bob Math A
2 Bob History B
3 Bob Language C
4 Bob Biology D
5 Sue History C
6 Sue Math A
7 Sue Music A
8 Sue Geography C
Pivot_table:
Subject Bob Sue
-------------------------
Math A A
History B C
Language C
Biology D
Music A
Geography C
Mysql中的脚本:
SET @sql = NULL;
SELECT GROUP_CONCAT(DISTINCT
CONCAT('MAX(CASE WHEN name = ''', name,
''' THEN grade END) `', name, '`'))
INTO @sql
FROM table1;
SET @sql = CONCAT('SELECT subject, ', @sql, '
FROM table1
GROUP BY subject');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
非常感谢