1.今天学习sql函数
AVG() 函数:SELECT AVG(column_name) FROM table_name
COUNT() 函数:SELECT COUNT(column_name) FROM table_name;
MAX() 函数:SELECT MAX(column_name) FROM table_name;
MIN()同理
SUM() 函数:SELECT SUM(column_name) FROM table_name;
1.今天学习sql函数
AVG() 函数:SELECT AVG(column_name) FROM table_name
COUNT() 函数:SELECT COUNT(column_name) FROM table_name;
MAX() 函数:SELECT MAX(column_name) FROM table_name;
MIN()同理
SUM() 函数:SELECT SUM(column_name) FROM table_name;