The document describes different types of relationships that can exist between database tables: 1 to 1 relationships where each row in one table is linked to exactly one row in another table; 1 to many relationships where each row in the first table can be linked to multiple rows in the second table but not vice versa; and many to many relationships where rows in both tables can be linked to multiple rows in the other table. The document also mentions 1 to many relationships twice and relates the concepts to skema relasi tabel or table relationship schemes in a database called DBS_DAGANG.

1. 1 TO 1
1 TO 1
1 TO MANY
MANY TO MANY
1 TO MANY
1 TO 1
SKEMA RELASI TABEL PADA DBS_DAGANG