错误查询SELECT SQL_CALC_FOUND_ROWS *来自用户WHERE gender ='$ gender'DESC limit 15

Question

帮帮我

错误讯息：

error query: "SELECT SQL_CALC_FOUND_ROWS * 
               FROM user WHERE gender='$gender'
               DESC limit 15";

Answer 1

问题在于这一行：

...WHERE gender='$gender' DESC limit 15

如您所见，您没有ORDER BY子句，但您使用了DESC个关键字。尝试通过删除关键字DESC

来修复它

...WHERE gender='$gender' limit 15

或添加ORDER BY子句

...WHERE gender='$gender' ORDER BY col_name DESC limit 15

Answer 2

原则上，两个选项中的任何一个都应该有效：

SELECT SQL_CALC_FOUND_ROWS * FROM `user` WHERE `gender`='$gender' LIMIT 15;

或运行不带SQL_CALC_FOUND_ROWS的查询，并执行单独的SELECT COUNT(*)查询

SELECT * FROM `user` WHERE `gender`='$gender' LIMIT 10;
SELECT COUNT(*) FROM `user` WHERE `gender`='$gender';

PS：反击字段名称是一个好习惯。