Question

我的代码：

DECLARE report_date DATETIME;
set report_date='2013-01-17 00:00:00';

SELECT  *
  FROM `NMPP`.`capacitypersecond` 
  WHERE `StreamDT` >=report_date and `StreamDT` < '2013-01-18 00:00:00'  ;

SELECT  *
  FROM `NMPP`.`capacityperHr` 
  WHERE `StreamDT` >=report_date and `StreamDT` < '2013-01-18 00:00:00'  ;

SELECT  *
  FROM `NMPP`.`capacityperDay` 
  WHERE `TJLDate` >=report_date and `TJLDate` < '2013-01-18 00:00:00'  ;

-

DECLARE report_date DATETIME;
/* SQL Error (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 report_date DATETIME' at line 1 */
/* Affected rows: 0  Found rows: 0  Warnings: 0  Duration for 0 of 5 queries: 0.000 sec. */

Answer 1

或使用演员：

set @report_date = cast('2013-01-17 00:00:00' as datetime);

Answer 2

摆脱declare：

set @report_date = '2013-01-17 00:00:00';

SELECT  *
  FROM `NMPP`.`capacitypersecond` 
  WHERE `StreamDT` >= @report_date and `StreamDT` < '2013-01-18 00:00:00'  ;

Answer 3

所有DECLARE都应该在触发器的存储过程的开头。

这不是一种类似C ++的语言，你可以混合声明和语句，但更像是C，其中所有声明必须在所有语句之前完成。

MYSQL如何声明datetime变量？

3 个答案: