Oracle 常用命令

1. 修改用户密码
alter user scott identified by tiger ;

2. 解除用户锁定状态
alter user scott account unlock ;

3. 给表加注释
COMMENT ON TABLE TableName IS 'comment';

4. 查看表的COMMENT
SELECT * FROM USER_TAB_COMMENTS WHERE Table_Name='TableName';

5. 给字段加注释
comment on column TableName.Column is 'comment';

6. 查看字段的COMMENT：
SELECT * FROM USER_COL_COMMENTS WHERE TABLE_NAME='TableName';

7. 查看字段的详细信息
select
    A.column_name 字段名,A.data_type 数据类型,A.data_length 长度,A.data_precision 整数位,
    A.Data_Scale 小数位,A.nullable 允许空值,A.Data_default 缺省值,B.comments 备注
from
    user_tab_columns A,user_col_comments B
where
    A.Table_Name = B.Table_Name
    and A.Column_Name = B.Column_Name
    and A.Table_Name = 'TableName'