![]() ![]() That form of the COUNT() function basically returns the number of rows in a result set returned by a SELECT statement. To counts all of the rows in a table, whether they contain NULL values or not, use COUNT(*). In each case, COUNT() returns a BIGINT that contains either the number of matching rows, or zero, if none were found. The secret is in the function signatures, of which there are several forms: COUNT(*), COUNT(expression) and COUNT(DISTINCT expression). But there’s a little more to it than that, as the COUNT() function can be utilized to count all rows in a table or only those rows that match a particular condition. You probably already know that the COUNT() function returns the number of rows in a table. ![]() In part 2, we’ll learn how to obtain a row count from multiple tables, or even from all of the tables within a database. ![]() In today’s tip, we’ll use the native COUNT() function to retrieve the number of rows within one table or view within a MySQL database. Some database management products provide database statistics like table sizes, but it can also be done using straight SQL. There are several ways to get a row count in MySQL. ![]()
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February 2023
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