SELECT * FROM ali_users WHERE DATEDIFF(CAST(CONCAT(DATE_FORMAT(NOW(),&#39;%y&#39;),DATE_FORMAT(birthday,&#39;-%m-%d&#39;))AS DATE),CAST(DATE_FORMAT(NOW(),&#39;%y-%m-%d&#39;) AS DATE)) <=1
1,准备测试数据,需要包含跨年的数据
1.1,准备测试数据的SQL
USE test;
DROP TABLE IF EXISTS ali_users;
CREATE TABLE ali_users (username VARCHAR(10),birthday DATE NOT NULL,iphone VARCHAR(16));
INSERT INTO ali_users SELECT \&#39;MaoYi\&#39;,\&#39;1985-09-04\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;LiuEr\&#39;,\&#39;1985-08-30\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;ZhangSan\&#39;,\&#39;1981-01-01\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;LiSi\&#39;,\&#39;1983-01-02\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;WangWu\&#39;,\&#39;1984-11-01\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;ZhaoLiu\&#39;,\&#39;1984-11-01\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;SongQi\&#39;,\&#39;1986-08-31\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;HuangBa\&#39;,\&#39;1989-09-01\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;ZengJiu\&#39;,\&#39;1989-09-02\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;LuoShi\&#39;,\&#39;1985-09-03\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;Tom\&#39;,\&#39;1995-09-05\&#39;,\&#39;13998786543\&#39; UNION ALL
SELECT \&#39;Licy\&#39;,\&#39;1991-12-30\&#39;,\&#39;13998286543\&#39; UNION ALL
SELECT \&#39;Cari\&#39;,\&#39;1992-12-31\&#39;,\&#39;13998286543\&#39; UNION ALL
SELECT \&#39;Mark\&#39;,\&#39;1992-01-03\&#39;,\&#39;13998286543\&#39; UNION ALL
SELECT \&#39;Ruby\&#39;,\&#39;1992-01-04\&#39;,\&#39;13998286547\&#39;;
1.2,在数据库命令行执行SQL
mysql> USE test;
DATABASE CHANGED
mysql> DROP TABLE IF EXISTS ali_users;
QUERY OK, 0 ROWS affected (0.00 sec)
mysql> CREATE TABLE ali_users (username VARCHAR(10),birthday DATE NOT NULL,iphone VARCHAR(16));
QUERY OK, 0 ROWS affected (0.01 sec)
mysql> INSERT INTO ali_users SELECT \&#39;MaoYi\&#39;,\&#39;1985-09-04\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;LiuEr\&#39;,\&#39;1985-08-30\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;ZhangSan\&#39;,\&#39;1981-01-01\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;LiSi\&#39;,\&#39;1983-01-02\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;WangWu\&#39;,\&#39;1984-11-01\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;ZhaoLiu\&#39;,\&#39;1984-11-01\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;SongQi\&#39;,\&#39;1986-08-31\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;HuangBa\&#39;,\&#39;1989-09-01\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;ZengJiu\&#39;,\&#39;1989-09-02\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;LuoShi\&#39;,\&#39;1985-09-03\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;Tom\&#39;,\&#39;1995-09-05\&#39;,\&#39;13998786543\&#39; UNION ALL
-> SELECT \&#39;Licy\&#39;,\&#39;1991-12-30\&#39;,\&#39;13998286543\&#39; UNION ALL
-> SELECT \&#39;Cari\&#39;,\&#39;1992-12-31\&#39;,\&#39;13998286543\&#39; UNION ALL
-> SELECT \&#39;Mark\&#39;,\&#39;1992-01-03\&#39;,\&#39;13998286543\&#39; UNION ALL
-> SELECT \&#39;Ruby\&#39;,\&#39;1992-01-04\&#39;,\&#39;13998286547\&#39;;
QUERY OK, 15 ROWS affected (0.01 sec)
Records: 15 Duplicates: 0 WARNINGS: 0
mysql>
2,写出查询SQL
SELECT * FROM ali_users WHERE
2,1,跨年问题分析
因为跨年的时候生日字段通常月份比较小是1月,所以如果利用DATEDIFF来判断要与月份比较大12月来比较得到相差天数在N天之内的话,就需要YEAR(NOW())+1,当年年份+1再加上月份才能与NOW()比较得出真实的相差天数。
2.2,5天之内的设定
N天之内,用 BETWEEN 0 AND N 来判断,如果是5天之内(包含今天)那么N值就是4,就是 BETWEEN 0 AND 4
3,验证数据
比如提醒最近5天之内(包括今日)过生日的同事,生日快乐。
3.1,查询的数据都在今年之内的,比如今天是8月30日,那么需要执行的SQL如下:
SELECT * FROM ali_users WHERE
查询的结果应该是从今天8月30日到9月3日之间过生日的同事,包括LiuEr,SongQi,HuangBa,ZengJiu,LuoShi;
mysql> SELECT * FROM ali_users WHERE
-> DATEDIFF(CAST(CONCAT(YEAR(NOW()),DATE_FORMAT(birthday,\&#39;-%m-%d\&#39;))AS DATE),CAST(DATE_FORMAT(NOW(),\&#39;%y-%m-%d\&#39;) AS DATE)) BETWEEN 0 AND 4
-> OR/* or后面的是捎带解决跨年问题*/
-> DATEDIFF(CAST(CONCAT(YEAR(NOW())+1,DATE_FORMAT(birthday,\&#39;-%m-%d\&#39;))AS DATE),CAST(DATE_FORMAT(NOW(),\&#39;%y-%m-%d\&#39;) AS DATE)) BETWEEN 0 AND 4
-> ;
+----------+------------+-------------+
| username | birthday | iphone |
+----------+------------+-------------+
| LiuEr | 1985-08-30 | 13998786543 |
| SongQi | 1986-08-31 | 13998786543 |
| HuangBa | 1989-09-01 | 13998786543 |
| ZengJiu | 1989-09-02 | 13998786543 |
| LuoShi | 1985-09-03 | 13998786543 |
+----------+------------+-------------+
5 ROWS IN SET (0.00 sec)
mysql>
3.2,查询的生日有跨年的
比如今天是2013年12月30日,要查询5天之内过生日的同事,那么就有2013年的12月30日31日过生日的,也有2014年1月1日2日3日过生日的同事,因为今天是8月30日,所以要把Step#2中的SQL的NOW()改成&#39;2013-12-30 00:10:10&#39;来进行测试,SQL整理如下:
mysql> SELECT * FROM ali_users WHERE
-> DATEDIFF(CAST(CONCAT(YEAR(\&#39;2013-12-30 00:10:10\&#39;),DATE_FORMAT(birthday,\&#39;-%m-%d\&#39;))AS DATE),CAST(DATE_FORMAT(\&#39;2013-12-30 00:10:10\&#39;,\&#39;%y-%m-%d\&#39;) AS DATE)) BETWEEN 0 AND 4
-> OR/* or后面的是捎带解决跨年问题*/
-> DATEDIFF(CAST(CONCAT(YEAR(\&#39;2013-12-30 00:10:10\&#39;)+1,DATE_FORMAT(birthday,\&#39;-%m-%d\&#39;))AS DATE),CAST(DATE_FORMAT(\&#39;2013-12-30 00:10:10\&#39;,\&#39;%y-%m-%d\&#39;) AS DATE)) BETWEEN 0 AND 4
-> ;
+----------+------------+-------------+
| username | birthday | iphone |
+----------+------------+-------------+
| ZhangSan | 1981-01-01 | 13998786543 |
| LiSi | 1983-01-02 | 13998786543 |
| Licy | 1991-12-30 | 13998286543 |
| Cari | 1992-12-31 | 13998286543 |
| Mark | 1992-01-03 | 13998286543 |
+----------+------------+-------------+
5 ROWS IN SET (0.00 sec)
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