我有一张这样的桌子
+---+-----+----+----+----+----+
|id |month|col1|col2|col3|col4|
+---+-----+----+----+----+----+
|101|Jan |A |B |NULL|B |
+---+-----+----+----+----+----+
|102|feb |C |A |G |E |
+---+-----+----+----+----+----+
然后我想创建这样的报告
+----+---+---+
|desc|jan|feb|
+----+---+---+
|col1|A |C |
+----+---+---+
|col2|B |A |
+----+---+---+
|col3|0 |G |
+----+---+---+
|Col4|B |E |
+----+---+---+
有人能帮忙吗？