1、查询表中列数
select count( column_name ) from user_tab_columns where table_name = '表名'; --表名为大写
或者
select count(column_name) from user_tab_columns where table_name=upper('表名');
2、查询表中所有列名
SELECT COLUMN_NAME FROM USER_TAB_COLUMNS WHERE TABLE_NAME =upper('organization_config' )ORDER BY COLUMN_ID