RL: https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html\n\n','mysql> SELECT PI();\n        -> 3.141593\nmysql> SELECT PI()+0.000000000000000000;\n        -> 3.141592653589793000\n','https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html');