// 通過user_tab_columns & user_col_comments 查詢所有表和列等屬性
SELECT *
FROM user_tab_columns a, user_col_comments b
WHERE a.TABLE_NAME = 'TEST02'
AND b.table_name = 'TEST02';
所有屬性如下：
TABLE_NAME,COLUMN_NAME,DATA_TYPE,DATA_TYPE_MOD,DATA_TYPE_OWNER,DATA_LENGTH,DATA_PRECISION,DATA_SCALE,NULLABLE,COLUMN_ID,DEFAULT_LENGTH,DATA_DEFAULT,NUM_DISTINCT,LOW_VALUE,HIGH_VALUE,DENSITY,NUM_NULLS,NUM_BUCKETS,LAST_ANALYZED,SAMPLE_SIZE,CHARACTER_SET_NAME,CHAR_COL_DECL_LENGTH,GLOBAL_STATS,USER_STATS,AVG_COL_LEN,CHAR_LENGTH,CHAR_USED,V80_FMT_IMAGE,DATA_UPGRADED,HISTOGRAM,TABLE_NAME_1,COLUMN_NAME_1,COMMENTS
// 通過user_tab_columns & user_col_comments 查詢字段的類型和長度信息
SELECT a.TABLE_NAME, b.COLUMN_NAME, a.DATA_TYPE, a.CHAR_USED, a.DATA_LENGTH, a.CHAR_LENGTH
FROM user_tab_columns a, user_col_comments b
WHERE a.TABLE_NAME = 'TEST02'
AND b.table_name = 'TEST02';
屬性說明：
完整的屬性說明參考官方文檔：https://docs.oracle.com/cd/B19306_01/server.102/b14237/statviews_2094.htm
| TABLE_NAME | Name of the table, view, or cluster |
| COLUMN_NAME | Column name |
| DATA_TYPE | Datatype of the column |
| CHAR_USED | B | C. B indicates that the column uses BYTElength semantics. C indicates that the column uses CHAR length semantics. NULL indicates the datatype is not any of the following:
|
| DATA_LENGTH | ength of the column (in bytes) |
| CHAR_LENGTH | Displays the length of the column in characters. This value only applies to the following datatypes:
|