SQL Deleting duplicate records by keeping a single row

Recently i came across a situation to remove duplicate records from a table by keeping a row . i used below listed SQL query pattern to achieve this .

DELETE
FROM Foo1
WHERE Foo1.ID IN

-- List 1 - all rows that have duplicates
(SELECT F.ID
FROM Foo1 AS F
WHERE Exists (SELECT Field1, Field2, Count(ID)
FROM Foo1
WHERE Foo1.Field1 = F.Field1
   AND Foo1.Field2 = F.Field2
GROUP BY Foo1.Field1, Foo1.Field2
HAVING Count(Foo1.ID) > 1))
AND Foo1.ID NOT IN

-- List 2 - one row from each set of duplicate
(SELECT Min(ID)
FROM Foo1 AS F
WHERE Exists (SELECT Field1, Field2, Count(ID)
FROM Foo1
WHERE Foo1.Field1 = F.Field1
   AND Foo1.Field2 = F.Field2
GROUP BY Foo1.Field1, Foo1.Field2
HAVING Count(Foo1.ID) > 1)
GROUP BY Field1, Field2);

SQL Server - Query to get references & constraints of a table

Just substitute 'YOUR TABLE NAME'  to the name of the table you want to see Reference , Constraints and other relationships.

SELECT

    K_Table = FK.TABLE_NAME,

    FK_Column = CU.COLUMN_NAME,

    PK_Table = PK.TABLE_NAME,

    PK_Column = PT.COLUMN_NAME,

    Constraint_Name = C.CONSTRAINT_NAME

FROM

    INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS C

INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS FK

    ON C.CONSTRAINT_NAME = FK.CONSTRAINT_NAME

INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS PK

    ON C.UNIQUE_CONSTRAINT_NAME = PK.CONSTRAINT_NAME

INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE CU

    ON C.CONSTRAINT_NAME = CU.CONSTRAINT_NAME

INNER JOIN (

            SELECT

                i1.TABLE_NAME,

                i2.COLUMN_NAME

            FROM

                INFORMATION_SCHEMA.TABLE_CONSTRAINTS i1

            INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE i2

                ON i1.CONSTRAINT_NAME = i2.CONSTRAINT_NAME

            WHERE

                i1.CONSTRAINT_TYPE = 'PRIMARY KEY'

                AND I1.TABLE_NAME = [YOUR TABLE NAME]

           ) PT

    ON PT.TABLE_NAME = PK.TABLE_NAME