05 - Relations between the tables .. Relations

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05 - Relations between the tables .. Relations
Click this bar to view the original image of 758x566px. Click this bar to view the original image of 786x219px. Important: finish dishwasher coupon * the relationship is a link between the two tables via a common value (a common field) between finish dishwasher coupon these two types of tables relations: 1 - one relationship ... One To One 2 - to-many relationship ... One To Many 1 - the parties to the relationship the parties. .. Many To Many types of keys: 1 - primary key ... Primary Key 2 - Key foreign ... Foreign Key examples of relations: Look at the pictures above are one - one relationship ... One To One to be the primary key is the same Both tables for any that each record in the primary table is matched by only one record in the secondary table 2 - to-many relationship ... One To Many to be the primary key in the primary table (Table father) offset by a foreign key in the secondary table (Table Jr.) that any Each record in the primary table is offset by more than one record in the secondary table 3 - the parties to the relationship of the parties ... Many To Many to each record in the primary table is offset by more than one record in the secondary table that each record in the secondary table offset by more than one record in the primary table and is one of the most difficult types of relationships and can not be represented directly, but a broken relationship of the parties to the parties Alaqtin each one-to-... One To Manay primary key ... Primary Key: is the value to be indexed on the basis of the table and be a unique value in the table does not repeat and fundamental and it is used in the relationships between the tables ... Indexed & Unique finish dishwasher coupon Value key foreign ... Foreign Key: is the value that is added to the table and son on the basis of the table are linked with the Father (the main table) and the value of replicable in the table and non-essential and which are used in the relationships between finish dishwasher coupon the tables ... None Unique Value
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