Oracle一行转多行

/**解决方法的核心是:产生出1-10的一个列,作为“辅助列”**/ SELECT LEVEL l FROM dual CONNECT BY LEVELlt;=10; 【问题】

/**创建测试的表T1 也就是楼主说的A表**/

CREATE TABLE t1(

ID VARCHAR2(10),

pid VARCHAR2(10)

);

/**创建测试的表T2 也就是楼主说的B表**/

CREATE TABLE t2(

pid VARCHAR2(10),

pnumber VARCHAR2(10)

);

/**插入T1的数据,插入T2的测试数据**/

INSERT INTO t1 VALUES('A1','1');

INSERT INTO t1 VALUES('A2','2');

INSERT INTO t1 VALUES('A3','3');

INSERT INTO t2 VALUES('1','2');

INSERT INTO t2 VALUES('2','3');

INSERT INTO t2 VALUES('3','5');

/**解决方法的核心是:产生出1-10的一个列,作为“辅助列”**/

SELECT LEVEL l FROM dual CONNECT BY LEVEL<=10;

/**最终的SQL**/

SELECT T1.ID, 'A1-'||T3.DZ AS LIST

FROM T1, T2, (SELECT LEVEL DZ FROM DUAL CONNECT BY LEVEL <= 10) T3

WHERE T1.PID = T2.PID

AND T3.DZ <= T2.PNUMBER

ORDER BY 1,2;