如何取得一个表的所有字段名用逗号分割_MySQL
自从 Oracle 9i 开始，就可以通过SYS_CONNECT_BY_PATH 函数实现将从父节点到当前
行内容以“path”或者层次元素列表的形式显示出来。
取得一个表的所有字段名，用逗号分割。
select max(substr(SYS_CONNECT_BY_PATH(COLUMN_NAME, ','),2)) col from (
select COLUMN_NAME,column_id from user_tab_columns where table_name='&表名')
start with column_id=1
connect by column_id=rownum;
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