SELECT * FROM bannhac WHERE idNhacsi = nhacsi.idNhacsi

SELECT bannhac.tenBannhac, nhacsi.tenNhacsi FROM bannhac INNER JOIN nhacsi ON bannhac.idNhacsi = nhacsi.idNhacsi

SELECT tenBannhac, tenNhacsi FROM bannhac WHERE bannhac.idNhacsi = nhacsi.idNhacsi

SELECT tenBannhac, idNhacsi FROM bannhac WHERE idNhacsi = (SELECT idNhacsi FROM nhacsi)

SELECT * FROM bannhac WHERE tenNhacsi = 'Đỗ Nhuận'

SELECT tenBannhac, tenNhacsi FROM bannhac WHERE tenNhacsi = 'Đỗ Nhuận'

SELECT bannhac.tenBannhac, nhacsi.tenNhacsi FROM bannhac INNER JOIN nhacsi ON bannhac.idNhacsi = nhacsi.idNhacsi WHERE nhacsi.tenNhacsi = 'Đỗ Nhuận'

SELECT * FROM nhacsi WHERE tenNhacsi = 'Đỗ Nhuận'

SELECT tenBannhac, tenCasi FROM bannhac INNER JOIN banthuam ON bannhac.idBannhac = banthuam.idBannhac INNER JOIN casi ON banthuam.idCasi = casi.idCasi

SELECT * FROM bannhac, banthuam, casi

SELECT tenBannhac, tenCasi FROM bannhac, banthuam, casi WHERE bannhac.idBannhac = banthuam.idBannhac AND banthuam.idCasi = casi.idCasi

SELECT tenBannhac, tenCasi FROM banthuam WHERE bannhac.idBannhac = casi.idCasi

SELECT tenBannhac, tenTheloai FROM bannhac INNER JOIN nhacsi ON bannhac.idNhacsi = nhacsi.idNhacsi WHERE nhacsi.tenNhacsi = 'Văn Cao'

SELECT bannhac.tenBannhac, bannhac.tenTheloai FROM bannhac INNER JOIN nhacsi ON bannhac.idNhacsi = nhacsi.idNhacsi

SELECT bannhac.tenBannhac, nhacsi.tenNhacsi, theloai.tenTheloai FROM bannhac, nhacsi, theloai WHERE nhacsi.tenNhacsi = 'Văn Cao'

SELECT * FROM bannhac, nhacsi WHERE tenNhacsi = 'Văn Cao'

SELECT * FROM banthuam

SELECT tenBannhac, tenNhacsi, tenCasi FROM banthuam

SELECT banthuam.idBanthuam, bannhac.tenBannhac, nhacsi.tenNhacsi, casi.tenCasi FROM banthuam INNER JOIN bannhac ON banthuam.idBannhac = bannhac.idBannhac INNER JOIN nhacsi ON bannhac.idNhacsi = nhacsi.idNhacsi INNER JOIN casi ON banthuam.idCasi = casi.idCasi

SELECT tenBannhac, tenNhacsi, tenCasi FROM banthuam WHERE idBanthuam = bannhac.idBannhac

SELECT * FROM banthuam WHERE tenCasi = 'Lê Dung' AND tenTheloai = 'Nhạc trữ tình'

SELECT tenBannhac, tenTheloai, tenCasi FROM banthuam WHERE tenCasi = 'Lê Dung' AND tenTheloai = 'Nhạc trữ tình'

SELECT banthuam.idBanthuam, bannhac.tenBannhac, theloai.tenTheloai, casi.tenCasi FROM banthuam INNER JOIN bannhac ON banthuam.idBannhac = bannhac.idBannhac INNER JOIN theloai ON bannhac.idTheloai = theloai.idTheloai INNER JOIN casi ON banthuam.idCasi = casi.idCasi WHERE casi.tenCasi = 'Lê Dung' AND theloai.tenTheloai = 'Nhạc trữ tình'

SELECT * FROM banthuam WHERE idCasi = (SELECT idCasi FROM casi WHERE tenCasi = 'Lê Dung')

SELECT tenBannhac FROM bannhac

SELECT bannhac.tenBannhac FROM bannhac LEFT JOIN nhacsi ON bannhac.idNhacsi = nhacsi.idNhacsi WHERE nhacsi.idNhacsi IS NULL

SELECT * FROM bannhac

SELECT bannhac.tenBannhac FROM bannhac WHERE idNhacsi = NULL