mysql查询怎么了

Question

我的MySQL查询有什么问题？ 有什么立即让你感到震惊的吗？ 我也不完全了解AS的功能。 查询中的单词之间。 UNIX_TIMESTAMP（“ date”）是否也应该在日期前后加上“”？

$query = '
        SELECT 
            object_pk, 
            project_object_fk, 
            tbl_object.name 
        AS 
            name, 
            priority, 
            tbl_category.name 
        AS 
            category_name, 
            UNIX_TIMESTAMP("date") 
        AS 
            "date", 
            time, 
            login_pk, 
            concat_ws(" ", title, first_name, middle_name, last_name, suffix) 
        AS 
            person 
        FROM 
            tbl_object, 
            tbl_object_type, 
            tbl_task, 
            tbl_category, 
            tbl_object_category_link, 
            tbl_login, 
            tbl_contact 
        WHERE 
            UNIX_TIMESTAMP("date")>1327791600 
        AND 
            UNIX_TIMESTAMP("date")<1331420399 
        AND 
            object_type="task" 
        AND 
            tbl_task.object_fk=object_pk 
        AND 
            object_type_pk=object_type_fk 
        AND 
            tbl_object_category_link.object_fk=object_pk 
        AND 
            category_fk=category_pk 
        AND 
            login_owner_fk=login_pk 
        AND 
            contact_pk=contact_fk 
        AND 
            object_status="ACTIVE" 
        ORDER BY 
            time
    ';

Answer 1

更改您对mysql查询内容的报价。

在php'引用的字符串内，“”用于php字符串引用，或\\'用于sql字符串值

Answer 2

UNIX_TIMESTAMP("date") 
AS 
"date",  <-- probably this line

更改为：

UNIX_TIMESTAMP("date") 
AS 
`date`,

为了安全。