What is the difference between count () and count (*) function in MySQL?

Question

Difference between count(*) and count(columnName) in MySQL? The count(*) returns all rows whether column contains null value or not while count(columnName) returns the number of rows except null rows. 17 апр. 2019 г.

What is the difference between Count status and count (*)?

COUNT(*) counts the rows in your table. COUNT(column) counts the entries in a column - ignoring null values. Of course there will be performance differences between these two, but that is to be expected if they are doing different things.

What is difference between count () and count (*) function?

So, is there any difference? The simple answer is no – there is no difference at all. The COUNT(*) function counts the total rows in the table, including the NULL values.

What is difference between count (*) and Count column?

The difference is: COUNT(*) will count the number of records. COUNT(column_name) will count the number of records where column_name is not null.

What is the difference between count fieldname and count (*) function explain with an example?

COUNT() must be the only element in the SELECT list. that is you can not add any other field with count(). Count(fieldname): This function returns the number of rows that match the filtering conditions and have a non-null value records.

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