在MySQL中，COUNTIF函数并不是一个内置的函数
以下是一些示例：
SELECT COUNT(column_name) FROM table_name;
SELECT SUM(CASE WHEN column_name = 'value' THEN 1 ELSE 0 END) as count_value FROM table_name;
SELECT SUM(CASE WHEN column_name > value THEN 1 ELSE 0 END) as count_greater_than_value FROM table_name;
SELECT SUM(CASE WHEN column_name BETWEEN value1 AND value2 THEN 1 ELSE 0 END) as count_between_values FROM table_name;
这些示例可以应用于任何数据类型，包括数字、日期和字符串。只需根据需要调整条件即可。
