Cassandra: Count number of rows in a table

Below statement return number of rows in a table.

SELECT COUNT(*) FROM {TABLE_NAME};

cqlsh> CREATE KEYSPACE cassandratutorial WITH REPLICATION = 
   ... { 
   ...   'class' : 'SimpleStrategy', 
   ...   'replication_factor' : 1 
   ... };
cqlsh> 
cqlsh> CREATE TABLE IF NOT EXISTS cassandratutorial.employee (
   ...   id INT PRIMARY KEY, 
   ...   firstName VARCHAR,
   ...   lastName VARCHAR,
   ...   age int
   ... );
cqlsh> 
cqlsh> 
cqlsh> INSERT INTO cassandratutorial.employee JSON '{"id" : 1, "firstName" : "Krishna", "lastName" : "Gurram", "age" : 30}';
cqlsh> INSERT INTO cassandratutorial.employee JSON '{"id" : 2, "firstName" : "Ram", "lastName" : "Gurram", "age" : 31}' ;
cqlsh> INSERT INTO cassandratutorial.employee JSON '{"id" : 3, "firstName" : "Vijay", "lastName" : "Ponnam", "age" : 45}';
cqlsh> INSERT INTO cassandratutorial.employee JSON '{"id" : 4, "firstName" : "Chitra", "lastName" : "Rajan", "age" : 45}';
cqlsh> 
cqlsh> SELECT COUNT(*) FROM cassandratutorial.employee;

 count
-------
     4

(1 rows)

Warnings :
Aggregation query used without partition key

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