# 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

shoeb5436 + 0 comments It must return 2. so the answer is 2

birju + 1 comment Problem Statement Basics of Sets and Relations #1

You are given two sets. Set A = {1,2,3,4,5,6} Set B = {2,3,4,5,6,7,8}

How many elements are present in A∪B? Only enter the correct integer in the answering box. Do not include any extra spaces, tabs or newlines. how to write code can one show me ?

niteshyadavand21 + 0 comments It is just asking how many relation does each person have answer is 2 because 1. Number 2. sex

aashray18521 + 0 comments Mysql equivalent:

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

jacobdickey_2016 + 3 comments I dont understand what this is asking

manuelj + 0 comments This might help:

σ condition(relation): condition is a boolean expression in which rows are selected for which the condition is true

Source: http://jcsites.juniata.edu/faculty/rhodes/dbms/relalg.htm

brandon_loza15 + 1 comment rows are going vertically since they are asking for the number >3000 and the student name it should give you 2 rows

manuelj + 0 comments The condition is number < 3000, just in case someone gets confused.

LSRahul + 0 comments What is the count of rows returned in the following relational selection? ans =2

puneeth579 + 0 comments Where can I learn about all Notations mentioned in the question? Like Pie Sigma ( sorry I can't find those symbols in keyboard)

bwhiting + 1 comment I don't understand the notation. Where can I learn this?

mohdaasif6Asked to answer + 1 comment visit W3schools or TutorialsPoint via Google

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