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What is the difference between using COUNT(typeid) and COUNT(*) in a SQL query in PHP?

When using COUNT(typeid), the query will only count the rows where the typeid column is not null. On the other hand, using COUNT(*) will count all row...

How can count() and mysql_num_rows() functions be utilized in PHP to count MySQL data?

To count MySQL data in PHP, you can use the count() function to count the number of elements in an array returned by a MySQL query, or you can use the...

What is the difference between using COUNT(*) and COUNT(column) in a MySQL query for counting posts in PHP?

When counting posts in a MySQL query in PHP, using COUNT(*) will count all rows in a table regardless of null values in the specified column, while us...

What are the differences between using "Count" and "Count(distinct)" in a PHP MySQL query, and when should each be used?

When using "Count" in a MySQL query, it will count all rows that match the specified condition, including duplicates. On the other hand, "Count(distin...

What is the difference between using SELECT COUNT() and mysql_num_rows() to count records in a table?

The main difference between using SELECT COUNT() and mysql_num_rows() to count records in a table is that SELECT COUNT() directly retrieves the count...