如何在oracle模式中查找数据类型信息？

SELECT column_name, data_type, data_length, data_precision, data_scale
FROM user_tab_columns
WHERE table_name = 'YOUR_TABLE_NAME';

SELECT column_name, data_type, data_length, data_precision, data_scale
FROM all_tab_columns
WHERE table_name = 'YOUR_TABLE_NAME';

SELECT column_name, data_type, data_length, data_precision, data_scale
FROM dba_tab_columns
WHERE table_name = 'YOUR_TABLE_NAME';

DESCRIBE YOUR_TABLE_NAME;