Sql語句實現行轉列
轉換成如下表格
備注：類型兩列是唯一行，產品只有ABCD四個值
select '2018' NF,listagg(''''||CP||' '''||LX,',') WITHIN GROUP(ORDER BY LX) FROM TAB1;
解釋：把LX列和CP列拼接成：'CP' AS LX ,再利用listagg()函數轉換成一個字符串使用
上面SQL為了節省拼接空間，省略了AS
過程如下：
1.拼接如下：
2.用listagg()函數轉換成一個字符串，如下
‘A’ AS T1,'C' AS T2,‘B’ AS T3,'D' AS T4,‘D’ AS T5,'C' AS T6,‘D’ AS T7,'A' AS T8,‘B’ AS T9,'C' AS T10
3.SQL查詢相當於：
select '2018' NF,listagg(''''||CP||''''||‘ AS '||LX,',') WITHIN GROUP(ORDER BY LX) FROM TAB1;
相當於：
select '2018' NF, ‘A’ AS T1,'C' AS T2,‘B’ AS T3,'D' AS T4,‘D’ AS T5,'C' AS T6,‘D’ AS T7,'A' AS T8,‘B’ AS T9,'C' AS T10 FROM TAB1;
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