mysql - 下面的 mysql 查询的改进

Question

SELECT * FROM ***** 
WHERE ((first_appeared_on BETWEEN DATE_SUB( '2015-07-28' , INTERVAL 1 DAY ) AND '2015-07-28') 
      or (last_appeared_on BETWEEN DATE_SUB( '2015-07-28' , INTERVAL 1 DAY ) AND '2015-07-28'))

在上面的查询中，我不想一次又一次地输入日期 (2015-07-28) 我可以使用变量并为该变量分配一个值吗

日期 = '2015-07-28';

SELECT * FROM ***** 
WHERE ((first_appeared_on BETWEEN DATE_SUB(day , INTERVAL 1 DAY ) AND day) 
      or (last_appeared_on BETWEEN DATE_SUB( day , INTERVAL 1 DAY ) AND day))

Answer 1

这可以在 MySQL 中使用 user-defined variable 来完成。 :

SET @day = '2015-07-28';

SELECT * FROM ***** 
WHERE ((first_appeared_on BETWEEN DATE_SUB( @day , INTERVAL 1 DAY ) AND @day) 
  or (last_appeared_on BETWEEN DATE_SUB( @day , INTERVAL 1 DAY ) AND @day));