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Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows:
σ AGE <=30 (PERSON)
The resultant relation will be as shown:
PERSON_ID
NAME
AGE
ADDRESS
2
Sharad Gupta
30
Pocket 2, Mayur
Vihar.
Note:
1) Select operation is commutative; i.e.,
σ (σ (R)) = σ (σ (R))
Therefore, series of select can be applied in any order
2) More than one condition can be applied using Boolean operators OR & AND etc.
It defines that the tuple in one relation that refers to another relation must refer to an existing tuple in that relation. This constraint is states on two relations (not essentia
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