oracle数据库行转列，列转行以及合并字符串之间的操作

建表语句 CREATE TABLE TBL_A ( NAME VARCHAR2(50), SUBJECT VARCHAR2(50), GRADE NUMBER(10,2) ) INSERT INTO TBL_A ( NAME, SUBJECT, GRADE)VALUES ( ‘张三’, ‘语文’, 90); INSERT INTO TBL_A ( NAME, SUBJECT, GRADE)VALU

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