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CREATE TABLE data(
irs_number VARCHAR (50),
mop_up INTEGER,
ou VARCHAR (50)
)

INSERT INTO data VALUES
('0001', 1, 'abc'),
('0001', 0, 'abc'),
('0001', 0, 'cde'),
('0001', 0, 'abc'),
('0002', 1, 'abc'),
('0002', 0, 'abc'),
('0003', 0, 'abc'),
('0003', 0, 'xyz')

Records: 8  Duplicates: 0  Warnings: 0
SELECT irs_number, mop_up, ou
FROM data d
WHERE EXISTS (SELECT 1
FROM data d2
WHERE d2.irs_number = d.irs_number AND
d2.mop_up = 1
) AND
EXISTS (SELECT 1
FROM data d2
WHERE d2.irs_number = d.irs_number AND
d2.ou <> d.ou
)
irs_number mop_up ou
0001 1 abc
0001 0 abc
0001 0 cde
0001 0 abc