Question

基本上，我有一个将数据导出为excel的csv格式的函数...我正在尝试使用单个查询来选择所选时间段内的所有销售记录，但我需要第一列被查询来自另一张桌子。我当前的查询如下：

$select = "SELECT `record_date` AS 'Sale Date',
                  `record_order_number` AS 'Order #',
                  `record_activity_number` AS 'Activity #',
                  `record_total_diy_revenue` AS 'Revenue $'
             FROM st_entered_records 
            WHERE `record_user_id` = '$this->user_id' AND 
                  `record_date` BETWEEN '$this->start_date' AND '$this->end_date' ";

之前

`record_date` AS 'Sale Date'

我需要它来运行第二个选择以获取用户名和格式的名字：

"LastName, FirstName"
 (user_last_name)", "(user_first_name) from a second table (st_users) 
 where `user_id` = '$this->user_id'

任何帮助将不胜感激！ :)

Answer 1

你可以做一个连接示例：

    SELECT t2.lastName,t2.firstName,
           t1.record_date AS 'Sale Date',
           t1.record_order_number AS 'Order #',
           t1.record_activity_numbe AS 'Activity #',
           t1.record_total_diy_revenue AS 'Revenue $' 

    FROM st_entered_records1 t1

    INNER JOIN stusers t2 ON t1.record_user_id=t2.userid

    WHERE t1.userid = $this->user_id AND
    t1.record_date BETWEEN $this->start_date AND $this->end_date

请确保您匹配表名和字段名，我相信您已经知道这一点：）

编辑：Stongly advise you do not use MYSQL_*

原因：

This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used.

Answer 2

尝试

SELECT
    `st_entered_records`.`record_date` AS 'Sale Date',
    `st_entered_records`.`record_order_number` AS 'Order #',
    `st_entered_records`.`record_activity_number` AS 'Activity #',
    `st_entered_records`.`record_total_diy_revenue` AS 'Revenue $',
    `st_users`.`user_last_name` AS 'LastName',
    `st_users`.`user_first_name` AS 'FirstName',
FROM `st_entered_records`
INNER JOIN `st_users` ON `st_entered_records`.`record_user_id` = `st_users`.`user_id`
WHERE
    `record_user_id` = :uid AND
    `record_date` BETWEEN :startDate AND :endDate;

顺便说一下，我用命名参数替换了变量。我强烈建议使用预准备语句，但如果你坚持使用连接查询（无论是使用mysql，mysqli还是PDO），请记住转义变量！

MySQL查询从一个查询中的第二个表中选择一些数据

2 个答案: