带有动态列的MySQL查询无法正常运行内部连接

Question

以下查询未在mysql中运行

SELECT (@a:=@a+1 ) AS sl, student_id, student_name, schl_id, class_id  FROM `trans_student` AS TS, **(SELECT @a:=0) bas**  WHERE TS.status= 1 AND `academic_year` = '2016-2017' ORDER BY sl ASC LIMIT 0,15

但这正在运行

SELECT (@a:=@a+1 ) AS sl, student_id, student_name, schl_id, class_id, academic_year,way, route_name, bus_driver, bus_phone  FROM `trans_student` TS
                 INNER JOIN trans_route TR ON TS.route_id = TR.route_id
                 LEFT JOIN trans_bus TB ON TS.bus_id = TB.bus_id,
                 **(SELECT @a:=0) AS  B**
                 WHERE TS.status= 1 AND `academic_year` = '2016-2017' ORDER BY sl ASC LIMIT 0,15;

你可以帮助我让第一个查询运行吗？动态列作为序列号的一些问题，但第二个查询工作正常，添加了一些内连接和左连接。

Answer 1

def gameLoop():
  while gameOver == True:
    // Show game over screen

  while gameExit == False:
    // Runs the game
    // Can set gameOver variable to true

当把动态表放在第一位就行了..谢谢

Answer 2

此查询：

SELECT (@a := @a + 1 ) AS sl, student_id, student_name, schl_id, class_id
FROM `trans_student` TS, 
     (SELECT @a := 0) bas
WHERE TS.status = 1 AND
      `academic_year` = '2016-2017'
ORDER BY sl ASC
LIMIT 0, 15;

从我能说的来看，这是好的。我不喜欢FROM子句中的逗号，因此我会将,替换为CROSS JOIN。并且，我无法保证表名和列，但使用变量很好。

请注意，**不应出现在查询中。错误消息表明这些字符在查询中。