查询某个字段存在于哪几个表

1.Oracle

select owner, table_name
from dba_tab_columns
where lower(column_name)=‘firstname‘;

2.mysql

USE information_schema;

SELECT `TABLE_NAME`

FROM `COLUMNS`

WHERE `COLUMN_NAME`=‘fid‘

3.pgsql

SELECT

c.relname,

col_description (a.attrelid, a.attnum) AS COMMENT,

format_type (a.atttypid, a.atttypmod) AS TYPE,

a.attname AS NAME,

a.attnotnull AS notnull

FROM

pg_class AS c,

pg_attribute AS a

WHERE a.attrelid = c.oid

AND a.attnum > 0

AND a.attname = ‘topic_id‘