How to retrieve foreign key constraints data

After some "reverse-engineering" on the queries made by the Navicat tool when opening the design table window for a table (queries retrieving info about foreign keys show up in the history window), here is a solution:

SELECT
    CONS.CONSTRAINT_NAME,
    CONS.TABLE_NAME,
    COLS.COLUMN_NAME,
    CONS.R_CONSTRAINT_NAME,
    CONS_R.TABLE_NAME R_TABLE_NAME,
    COLS_R.COLUMN_NAME R_COLUMN_NAME

FROM USER_CONSTRAINTS CONS
    LEFT JOIN USER_CONS_COLUMNS COLS ON COLS.CONSTRAINT_NAME = CONS.CONSTRAINT_NAME
    LEFT JOIN USER_CONSTRAINTS CONS_R ON CONS_R.CONSTRAINT_NAME = CONS.R_CONSTRAINT_NAME
    LEFT JOIN USER_CONS_COLUMNS COLS_R ON COLS_R.CONSTRAINT_NAME = CONS.R_CONSTRAINT_NAME

-- returns only foreign key constraints
WHERE CONS.CONSTRAINT_TYPE = 'R'

ORDER BY CONS.TABLE_NAME, COLS.COLUMN_NAME

SQL Developer ships with a report that does just this.

It does it for the login schema only, but it's a quick fix to make it go get every single FK in the database - although you might want to omit schemas like 'APEX...' and 'SYS.'

It also omits things like, tables in the recycle bin.

The original report is in the Reports panel, in the data dictionary reports.

Here's the amended query to get ALL the FKs.

    SELECT
    c.owner "Owner",
    c.table_name "Table_Name",
    c.constraint_name "Constraint_Name",
    c.delete_rule "Delete_Rule",
    d.columns,
    c.r_owner "Owner of Related Table",
    (
        SELECT
            r.table_name
        FROM
            sys.all_constraints r
        WHERE
            c.r_owner = r.owner
        AND
            c.r_constraint_name = r.constraint_name
    ) "Related Table",
    c.r_constraint_name "Related Constraint"
FROM
    sys.all_constraints c,
    (
        SELECT
            a.owner,
            a.table_name,
            a.constraint_name,
            MAX(
                DECODE(position,1,substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,2,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,3,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,4,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,5,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,6,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,7,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,8,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,9,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,10,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,11,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,12,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,13,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,14,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,15,','
                 ||  substr(column_name,1,30),NULL)
            )
             ||  MAX(
                DECODE(position,16,','
                 ||  substr(column_name,1,30),NULL)
            ) columns
        FROM
            sys.all_constraints a,
            sys.all_cons_columns b
        WHERE
            a.constraint_name = b.constraint_name
        AND
            a.owner = b.owner
        AND
            a.constraint_type = 'R'
        AND
            substr(a.table_name,1,4) != 'BIN$'
        AND
            substr(a.table_name,1,3) != 'DR$'
        AND (
                :table_name IS NULL
            OR
                instr(upper(a.table_name),upper(:table_name) ) > 0
        ) GROUP BY
            a.owner,
            a.table_name,
            a.constraint_name
    ) d
WHERE
    c.owner = d.owner
AND
    c.table_name = d.table_name
AND
    c.constraint_name = d.constraint_name
ORDER BY
    c.owner,
    c.table_name,
    c.constraint_name

And here's what that report looks like.