There are 3 types of relationships.
1)one-one
2)one-many
3)many-many
one-one relationship means,when there is eactly one record in table 1 that corresponds to exactly one record in table 2.
one-many relationship means,when there is eactly one record in table 1 that may have many linked records table 2,But each record in Table 2 must have only one corresponding records in Table 1.
many-many relationship means,when one record in table 1 that may have many linked records table 2 and vice-verca.
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