tibi01993 http://www.mathsisfun.com/algebra/sigma-notation.html This link explains clearly what is that symbol. FYI
aashray18521 Mysql equivalent:
Select count(*) from student where number<3000;
shahnawaz_jrw 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.
shoeb5436 It must return 2. so the answer is 2
jacobdickey_2016 I dont understand what this is asking
manuelj 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 rows are going vertically since they are asking for the number >3000 and the student name it should give you 2 rows
manuelj The condition is number < 3000, just in case someone gets confused.
LSRahul What is the count of rows returned in the following relational selection? ans =2
raunakpandey1007 WRITE 2 AND CLICK ON SUBMIT
coder_aky :-)
2
grinyahoo_f Font size is too little in the expression
niteshyadavand21 It is just asking how many relation does each person have answer is 2 because 1. Number 2. sex
puneeth579 Where can I learn about all Notations mentioned in the question? Like Pie Sigma ( sorry I can't find those symbols in keyboard)
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