mysql - 在 MySQL 中使用 DECLARE 创建变量

Question

我承认，我是 T-SQL 专家，而不是 MySQL 专家，但我不太明白为什么会收到此错误消息:

#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 'DECLARE @UpdatedID VARCHAR(5)' at line 1 

这是我的查询:

DECLARE @UpdatedID VARCHAR(5);

SET @UpdatedID = 63;

CREATE TABLE tmp_markers (SELECT * FROM tmp_markers2);

UPDATE tmp_markers
SET Id = Id+1
WHERE Id >= @UpdatedID;

UPDATE tmp_markers
SET Id = @UpdatedID
WHERE Id = MAX(Id);

DELETE from tmp_markers2;

INSERT INTO tmp_markers2
(SELECT * FROM tmp_markers ORDER BY id);

DROP TABLE tmp_markers

Answer 1

在 MySQL 中声明一个变量是用你所做的来完成的:

SET @UpdatedID = 63;

DECLARE 语句用于存储过程中。参见 this .