项目开发中我们经常遇到整理数据设计文档的场景，用这个脚本可以直接查询出来整理文档中我们需要的内容
with tmp as (
select
col.column_name,
con.constraint_type
from user_constraints con
left join user_cons_columns col on con.constraint_name = col.constraint_name
where con.table_name = ''
)
select
a.table_name,
d.comments as table_comment,
a.cloumn_name,
b.comments as column_comment,
case
when a.data_type = 'VARCHAR2' then
a.data_type || '(' a.data_length || ')'
when a.data_type = 'NUMBER' then
(case
when a.data_precision is not null then
a.data_type || '(' || a.data_precision || ',' || nvl(a.data_scale,0) || ')'
end
)
else a.data_type
end as data_type
a.nullable,
c.constraint_type
from
user_tab_columns a
left join user_col_comments b on a.table_name = b.table_name and a.column_name = b.column_name
left join tmp c on a.column_name = c.column_name
left join user_tab_comments d on a.table_name = d.column_name
where
a.table_name = ''
order by
a.column_id
