MySQL Count

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The COUNT() function returns the number of rows in a query.

The COUNT() function is used with MySQL SELECT statement and it is very useful to count the number of rows in a table having enormous data.


SELECT COUNT (expression)  
FROM tables  
WHERE conditions;

Let's put these statements into real use.

We've a table named Students in our database that contains the following records:

Now lets Count the number of record from Students Table.


SELECT Count(ROLL_NO)  
FROM Students;

The above SELECT statement Counts the number of ROLL_NO.

Count(ROLL_NO)
6

We can count number of rows with where condition.


    SELECT Count(ROLL_NO) 
    FROM Students
    WHERE SUBJECT='JAVA'

The above SELECT statement COUNT row number of SUBJECT is 'JAVA'.

Count(ROLL_NO)
3

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MySQL - COUNT()