We use count(*) to get the total number of records.
SQL>select count(*) from emp2;
Note:-There is no difference between count(*) and count(1) .
SQL>select count(1) from emp2;
But there is a difference between count(*) and count(column_name) .Count(*) return the total number of records of table and count(column_name) return the count of records that have not null value in that column.
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