php - MYSQL中的2个表的查询

Question

我在 MySQL 中有两个表:

表1

Week    From         Until
1    2015-04-01    2015-04-07
2    2015-04-08    2015-04-14
3    2015-04-15    2015-04-21
4    2015-04-22    2015-04-28

表2

Input_Date        Code
2015-04-10        123
2015-04-22        456
2015-04-25        123
2015-04-26        123

1. 我使用此查询根据当前日期选择当前星期:

   从 Week WHERE(NOW() BETWEEN table_1 和 From 之间)中选择 Until

2. 我需要选择“代码”并从表 2 中对其进行计数，其中“Code”= 123 并且“Input_Date”对应于当前“周”。

*如果当前日期是 2015-04-23，“周”将为 = 4

结果将是:

Week   Code  Count
 4     123     2

Answer 1

尝试-

SELECT t1.Week, t2.Code, COUNT(*) 
FROM table_1 t1 
LEFT JOIN table_2 t2
ON t2.Input_Date BETWEEN t1.From AND t1.Until
WHERE (NOW() BETWEEN t1.From AND t1.Until) 
AND t2.Code = 123

http://sqlfiddle.com/#!9/3d2a6/16