SQL COUNT()

The SQL COUNT() function is used to count the number of rows in a table that meet a specific condition. It is one of the most commonly used functions in SQL.

The syntax for the COUNT() function is:

SELECT COUNT(column_name) FROM table_name WHERE condition;

Here, column_name is the name of the column whose values you want to count, table_name is the name of the table where the column is located, and condition is an optional condition that specifies which rows to count.

If you want to count all the rows in the table, regardless of their values, you can use the asterisk (*) instead of a specific column name, like this:

SELECT COUNT(*) FROM table_name;

This will return the total number of rows in the table.