Kuidas arvutada veeru mitte-null elementide arv?

To count the number of non-zero elements in a SQL table column, you can use the aggregate function COUNT with a condition that filters out zero values.

Example query:

SELECT COUNT(*) AS non_zero_count
FROM table_name
WHERE column_name <> 0
  AND column_name IS NOT NULL;

Here:

• column_name <> 0 excludes zeros,
• column_name IS NOT NULL excludes NULL values.

If you want to count only non-zero values, this query will return their count.

In the context of data analysis or machine learning, such counting helps to understand the distribution of values and the density of data in the column.