Question

我编辑了这个问题导致下面提到的答案，当使用while和begin时，它应该在一个存储过程中。

所以现在我在存储过程中运行它，但我仍然收到错误。

counter;
while counter < 2
begin
GOTO counter

SELECT var1 AS LOCATION,
  ROUND(sum(CASE WHEN t2.tagid = var2 THEN t2.floatvalue ELSE 0 END), 2) AS MR
  ROUND(sum(CASE WHEN t2.tagid = var3 THEN t2.floatvalue ELSE 0 END), 2) AS Flw,
  ROUND(sum(CASE WHEN t2.tagid = var4 THEN t2.floatvalue ELSE 0 END), 2) AS Prs,
  ROUND(sum(CASE WHEN t2.tagid = var5 THEN t2.floatvalue ELSE 0 END), 2) AS Lvl
FROM table2 t2

INNER JOIN table1  t1
  ON t1.id = t2.tagid

WHERE t2.t_stamp = (SELECT MAX(t2.t_stamp) 
                    FROM table2  t2 
                    WHERE t1.id = t2.tagid)
counter = counter+1
end

1:
var1
var2
var3
var4
var5

2:
var1
var2
var3
var4
var5

这是我得到的错误

MySQL said: #1064 -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 'begin GOTO counter SELECT var1 AS LOCATION, ROUND(sum(CASE WHEN t2.tagid' at line 2

我没有包含CREATE PROCEDURE因为我看到了一个帖子，其中更容易进入ROUTINES面板并粘贴没有CREATE，DELIMITER等的SQL查询等。我该如何解决这个错误？

Answer 1

MySQL中的控制流语句（WHILE，IF等）可以在存储例程的上下文中使用（过程，函数，触发器，事件）。您不能在SQL批处理中单独使用它们。

<强> Flow Control Statements
MySQL支持IF，CASE，ITERATE，LEAVE LOOP，WHILE和REPEAT构造，用于流程控制在存储程序中。

mysql循环错误代码＃1064内存[修订]

1 个答案: