使用范围条件中的值时出错

Question

大家好，我在查询条件中尝试使用@year文本时遇到问题

我用过：

SET @year := "2013";

SELECT count(*) as July FROM sinisters
WHERE date BETWEEN "@year-07-01" AND "@year-07-31" )

我一无所获。

我也试过了：

SET @year := "2013";

SELECT year(date) as July FROM sinisters
WHERE date BETWEEN "'{@year}'-07-01" AND "'{@year}'-07-31" )

我想像2013年一样使用@year。

请有人帮我这个吗？

Answer 1

使用CONCAT函数连接变量和固定文本：

SELECT count(*) as July FROM sinisters WHERE date BETWEEN CONCAT(@year, "-07-01") AND CONCAT(@year, "-07-31")