Question

这个MySQL查询出了什么问题？

    $result = mysql_query("SELECT did FROM publications where group IN 
(SELECT s_group FROM subscriptions where uid1='$id')") or die(mysql_error());

我收到语法错误：

        You have an error in your SQL syntax; check the manual that corresponds 
    to your MySQL server version for the right syntax to use near 's_group FROM 
subscriptions where uid1='34846')' at line 1

Answer 1

GROUP是保留关键字。围绕`将表示它是一个列名：

SELECT did FROM publications where `group` IN 
(SELECT s_group FROM subscriptions where uid1=1)

Answer 2

你必须编写像group这样的“group”列，因为关键字组是MySQL中的保留关键字。

$result = mysql_query("SELECT did FROM publications where `group` IN 
(SELECT s_group FROM subscriptions where uid1='$id')") or die(mysql_error());

或者您可以使用别名

$result = mysql_query("SELECT did FROM publications p where p.group IN 
(SELECT s_group FROM subscriptions where uid1='$id')") or die(mysql_error());

Answer 3

按照@paulius的说法检查，然后检查uid1的数据类型（如果是数字），而不是从$ id中删除引号

子查询中的MySQL语法错误

3 个答案: