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what is the main difference between constraints(like
primary key etc..)& joins?
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Answer Posted / monal
Constraints are restrictions to make sure that data entered
in a table must meet certain crietria. You can put
constraint at either table level or column level. There are
5 types of constraints. Primary Key, Foregin Key, Unique,
Check and NOT NULL.
Joins are used to combine rows from one or more table. One
table using Self Join and More tables using inner join,
outer join, cross join.
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