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# Basics of Sets and Relations #5

# Basics of Sets and Relations #5

tibi01993 + 0 comments http://www.mathsisfun.com/algebra/sigma-notation.html This link explains clearly what is that symbol. FYI

aashray18521 + 0 comments Mysql equivalent:

`Select count(*) from student where number<3000;`

shahnawaz_jrw + 0 comments Answer is: 2

Syntax: σp(r)

Where, σ represents the Select Predicate, r is the name of relation(table name in which you want to look for data), and p is the prepositional logic, where we specify the conditions that must be satisfied by the data. In prepositional logic, one can use unary and binary operators like =, <, > etc, to specify the conditions.

grinyahoo_f + 0 comments Font size is too little in the expression

nethmi_sw + 0 comments σ(Number<3000)(Student) This Unary Relational Algebraic operation means, select number of students below 3000. So, the answer is 2.

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