select table_name from user_tables;
--查詢所有表的所有字段資訊
select a.table_name as 表名,
a.column_name as 列名 ,
a.data_type as 資料型別,
a.data_length as 長度,
a.nullable as 是否為空,
case when d.constraint_type = 'p' then 'y'
else 'n'end 是否為主鍵,
a.nullable as 為空,
a.column_id as 列序號,
b.comments as 備註
from user_tab_cols a inner join user_col_comments b on b.table_name=a.table_name
and b.column_name=a.column_name left outer join user_cons_columns c on a.table_name = c.table_name
and a.column_name = c.column_name left outer join user_constraints d on c.constraint_name = d.constraint_name
where a.table_name in (
select table_name from user_tables
group by a.table_name
--查詢單個表的所有字段資訊
select a.table_name as 表名,
a.column_name as 列名 ,
a.data_type as 資料型別,
a.data_length as 長度,
a.nullable as 是否為空,
case when d.constraint_type = 'p' then 'y'
else 'n'end 是否為主鍵,
a.column_id as 列序號,
b.comments as 備註
from user_tab_cols a inner join user_col_comments b on b.table_name=a.table_name
and b.column_name=a.column_name left outer join user_cons_columns c on a.table_name = c.table_name
and a.column_name = c.column_name left outer join user_constraints d on c.constraint_name = d.constraint_name
where a.table_name = 'code_dict'
--簡單查詢column資訊
select a.column_id,
a.column_name,
a.data_type,
a.data_length,
a.data_precision,
a.data_scale,
a.nullable,
a.data_default
from user_tab_columns a where table_name = 'code_dict'
order by column_id
select
a.column_name,a.data_type,a.data_length,a.data_precision,
a.data_scale,a.nullable,a.data_default,b.comments,d.constraint_type
from
user_tab_columns a,user_col_comments b ,user_cons_columns c ,user_constraints d
where
a.table_name = b.table_name
and a.column_name = b.column_name
and a.table_name = c.table_name and a.column_name = c.column_name
and c.table_name = d.table_name and c.constraint_name = d.constraint_name
and a.table_name = 'code_dict'
order by
column_id
select * from user_constraints d where d.table_name ='code_dict'
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