sql count
/*COUNT(column_name) will return the number of rows from the column
that are not NULL*/
SELECT COUNT(column_name)
FROM table_name;
/*COUNT(*) will return the number of rows from the table*/
SELECT COUNT(*)
FROM table_name;sql count
/*COUNT(column_name) will return the number of rows from the column
that are not NULL*/
SELECT COUNT(column_name)
FROM table_name;
/*COUNT(*) will return the number of rows from the table*/
SELECT COUNT(*)
FROM table_name;sql count(*)
SELECT COUNT(column_name)
FROM table_name
WHERE condition;sql count where
SELECT count(CASE WHEN gender = 'F' THEN 1 ELSE NULL END) women_count,
count(CASE WHEN gender = 'M' THEN 1 ELSE NULL END) men_count
FROM people;Copyright © 2021 Codeinu
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