How can I find the underlying column and table name for an Oracle view?

Question

This sounds like it should be simple to do but not so! There is no Oracle (meta-data) view that I can find that gives the underlying column and table name for an Oracle view col

Answer 1

This works well if you want a views table and column dependencies:

WITH view_dependencies (view_name, table_name) AS (
    SELECT CONNECT_BY_ROOT d.name AS view_name, d.referenced_name AS table_name
    FROM all_dependencies d
    WHERE d.referenced_type IN ('TABLE', 'VIEW')
    START WITH d.name = UPPER('jtf_rs_resource_extns_vl') AND d.type = 'VIEW'
    CONNECT BY PRIOR d.referenced_name = d.name AND PRIOR d.referenced_type = d.type
)
SELECT deps.view_name, deps.table_name, tbl.table_id, cols.column_id, 
       cols.column_name  
FROM view_dependencies deps
    LEFT JOIN FND_TABLES tbl ON tbl.table_name = deps.table_name
    LEFT JOIN FND_COLUMNS cols ON tbl.table_id = cols.table_id
ORDER BY deps.view_name,  deps.table_name, cols.column_sequence;

Outputs

VIEW_NAME                   TABLE_NAME            TABLE_ID COLUMN_ID COLUMN_NAME
=======================================================================================
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563724  RESOURCE_ID
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563712  CREATED_BY
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563713  CREATION_DATE
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563718  LAST_UPDATED_BY
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563719  LAST_UPDATE_DATE
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563720  LAST_UPDATE_LOGIN
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563704  CATEGORY
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563725  RESOURCE_NUMBER
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563729  SOURCE_ID
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563686  ADDRESS_ID
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563709  CONTACT_ID
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563721  MANAGING_EMPLOYEE_ID
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563730  START_DATE_ACTIVE
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563714  END_DATE_ACTIVE
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563732  TIME_ZONE
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563711  COST_PER_HR
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563723  PRIMARY_LANGUAGE
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563726  SECONDARY_LANGUAGE
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563717  IES_AGENT_LOGIN
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563728  SERVER_GROUP_ID
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563687  ASSIGNED_TO_GROUP_ID
JTF_RS_RESOURCE_EXTNS_VL    JTF_RS_RESOURCE_EXTNS   80056   563710  COST_CENTER