SQL COUNT Command: Number of records
We can count the number of records in a table with different combinations.
Let us first count the total number of records in the table with this count
SELECT count( * ) as total_record FROM student
Output of above query is here.
This will display total records under the name total_record in the table student. Now we
can add some condition to this SQL to count the records with different
conditions. Let us find out the number of students in class Four in out
We are using alias here to display the value under hading total_record
SELECT count( * ) as total_record FROM `student` WHERE class = 'four'
Output is here
This will return the count of students in class four only. Here since we are
displaying only one count for a fixed class so we can use this way. We may
require to display total of each class in a table so here we have to use
GROUP BY clause to display totals of each class.
We can count the records in different combinations like finding out the number of students of class four who has got more than 60 mark.
SELECT count(*) FROM `student` WHERE class='Four' and mark >60
Ouput of above query is here.
SELECT count(*) FROM `student` WHERE class='Four' and mark between 50 and 60
Oupput is here
Count using unique id field
In above query we have used all the columns to find out the total number of records ( by using count(*) ) . In our student table we have id field which is unique and auto incremented. So if we apply count to this id filed then it will more efficient.
SELECT COUNT(id) as total_records FROM student
Download sql dump of this student table
Number of User Comments : 12
|More on getting records from table with different combinations of commands|
|IT'S VERY NICE|
|hi thanks for giving information thanks again... |
|please tell me the query if i want to count the no. employees from a table emp_detail (and display it) and also need to see the different entries of a different table course_detail ? I need to see them on single web page together..|
|Really simple and nice way to explain... Gr8 gng... Keep it Up ...|
|u r done a very good job.|
i need the answer for how to get the totals of the three columns in the table.
|how to get the totals of between two given date. |
|Pls I need a syntax for count with this scenario: patients who visited their gp in the last three months|
|how to add a new row of total at the last of all the integer record..|
plz help me
|Pls i need a syntax to increase the count by 1. (e.g): In a shop bill generation, the bill no should increase automatically by 1 at each bill|
|hi..plz help me out. i like to get count of records in the table ( included deleted recors ). in other words.. the number of records from the table creation.|
|Hi there, |
is it possible to do this?
Select count(enabled = 1) from user
|i have a question. i have a table with 2 fields(name,second field is no of cards)how i calculate all the no of cards with or without using sql,|
it is necessary to use sql or not