基于列的值(
COLUMN_NAME
)在表1中,我想在表2中插入3条新记录。
最好的方法是什么?我试过如下,但我不想使用三个查询使用
UNION ALL
SQL> DROP TABLE TABLE_2
Table dropped.
SQL> CREATE TABLE TABLE_2(EMP_ID VARCHAR2(10),VALUE VARCHAR2(10))
Table created.
SQL> TRUNCATE TABLE TABLE_2
Table truncated.
SQL> INSERT INTO TABLE_2
(EMP_ID,VALUE)
WITH TABLE_1 as
(
SELECT '111' AS EMP_ID,'COL1' COLUMN_NAME FROM DUAL
)
SELECT EMP_ID,CASE WHEN COLUMN_NAME = 'COL1' THEN 'RICK' END AS VALUE
FROM TABLE_1
UNION ALL
SELECT EMP_ID,CASE WHEN COLUMN_NAME = 'COL1' THEN 'TOM' END AS VALUE
FROM TABLE_1
UNION ALL
SELECT EMP_ID,CASE WHEN COLUMN_NAME = 'COL1' THEN 'ADAM' END AS VALUE
FROM TABLE_1
COMMIT
3 rows created.
SQL> SELECT * FROM TABLE_2
EMP_ID VALUE
---------- ----------
111 RICK
111 TOM
111 ADAM
3 rows selected.
