What does SELECT COUNT 1 from table name on any database table mean

0 votes
The number of rows is returned by selecting count(*) from table name.

How does count(1) function? What does 1 here mean? Is this identical to count(*) because it produces the same outcome when executed?
Sep 18, 2022 in Database by Kithuzzz
• 38,010 points
512 views

1 answer to this question.

0 votes
An expression to be tested for each row is the COUNT function's input. The number of rows for which the expression evaluates to a non-null value is the result of the COUNT function. The special expression (*) just returns the number of rows without being evaluated.

The statement can also be modified with the words ALL and DISTINCT. These decide whether or not duplicates are thrown away. Your example is the same as count(ALL 1) because ALL is the default, which indicates that duplicates are kept.

Since you are not eliminating duplicates and the formula "1" evaluates to non-null for every row, COUNT(1) ought to always yield the same result as COUNT(*).
answered Sep 19, 2022 by narikkadan
• 63,720 points

Related Questions In Database

0 votes
1 answer

What do ‘Record’, ‘Field’ and ‘Table’ mean in terms of a database?

You can refer to the following definitions ...READ MORE

answered Nov 12, 2018 in Database by Sahiti
• 6,370 points
21,467 views
0 votes
2 answers

What are the ways to get the count of records in a table

With the help of the SQL count ...READ MORE

answered Aug 20, 2020 in Database by Okugbe
• 280 points
3,754 views
0 votes
1 answer

What is the best way to fetch data from table?

Hey Shraddha, I understand your doubts about fetching ...READ MORE

answered May 25, 2019 in Database by sampriti
• 1,120 points
1,864 views
0 votes
2 answers

How to select the nth row in a SQL database table?

SELECT * FROM ( SELECT ID, NAME, ROW_NUMBER() ...READ MORE

answered Apr 23, 2020 in Database by anand
• 140 points
25,569 views
0 votes
1 answer

Automating Oracle script with nolio

Depending upon the details of your script ...READ MORE

answered Jul 17, 2018 in Other DevOps Questions by ajs3033
• 7,300 points
862 views
0 votes
1 answer

Is there any boolean type in Oracle database?

Nope. I don't think there is one But ...READ MORE

answered Oct 10, 2018 in Database by Neha
• 6,300 points
889 views
0 votes
1 answer

Please name some online websites to compile and run PL/SQL?

For executing Oracle SQL queries and PL/SQL ...READ MORE

answered Feb 11, 2022 in Database by Neha
• 9,060 points
1,288 views
0 votes
1 answer

ORACLE LIVE SQL IMPORT CSV DATA (live oracle sql)

Convert CSV to SQL http://www.convertcsv.com/csv-to-sql.htm This programme may be ...READ MORE

answered Feb 11, 2022 in Database by Neha
• 9,060 points
7,864 views
0 votes
1 answer

What does "DISTINCT ON (expression)" do?

The snippet from the Official documentation for PostgreSQL is ...READ MORE

answered Sep 16, 2022 in Database by narikkadan
• 63,720 points
477 views
0 votes
1 answer

What does the "@" symbol do in SQL?

The @CustID denotes a parameter for which ...READ MORE

answered Sep 10, 2022 in Database by narikkadan
• 63,720 points
1,037 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP