count_ifcount_if count_if介绍 count_if(expr) - 返回表达式中 TRUE 值的数量。 Examples: > SELECT count_if(col % 2 = 0) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col); 2 > SELECT count_if(col IS NULL) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col); 1 Since: 3.0.0countcount_min_sketch