时间, 字符, 数字 , 大于 小于,

总表结果:

1. 日期  date 和字符 匹配

SELECT * FROM `tabname`  where  `birthday`>= str_to_date('2013-09-02', '%Y-%m-%d') 
AND `birthday` <= str_to_date('2013-09-07', '%Y-%m-%d')
;

SELECT * FROM `tabname`  where  `birthday`>='2013-09-02' 
AND `birthday` <='2013-09-07';

SELECT * FROM `tabname`  where  `birthday`='2013-09-02' ;

上面  1结果和2结果相同   ,3能搜索出

 

2 datetime 日期时间  和字符   匹配

SELECT * FROM `tabname`  where  `starttime`>= str_to_date('2017-03-02', '%Y-%m-%d') 
AND `starttime` <= str_to_date('2017-03-07', '%Y-%m-%d')
;

SELECT * FROM `tabname`  where  `starttime`>='2017-03-02' 
AND `starttime` <='2017-03-07';

SELECT * FROM `tabname`  where  `starttime`='2017-03-02' ;
SELECT * FROM `tabname`  where  `starttime`='2017-03-07 17:32:23' ;

  结果1  和 结果2 相同   可是丢弃了  2017-03-07的数据 

结果3 ,没有数据, 结果4有一条

 

3. 字符   数字 匹配

总结:      字符比大小, 直接用  where   mychar >='1' ANd  mychar <='6';  

才能筛选出 , 开头在1到6之间的数字, '21' 也是小于'6' ,只匹配第一位

SELECT * FROM `tabname`  where  mychar <='b'; -- 1
SELECT * FROM `tabname`  where  mychar >='b'; -- 2



SELECT * FROM `tabname`  where  mychar >='6';  -- 3
SELECT * FROM `tabname`  where  mychar <='6'; -- 4


SELECT * FROM `tabname`  where  mychar >=6;  -- 5
SELECT * FROM `tabname`  where  mychar <=6;	 -- 6

SELECT * FROM `tabname`  where  mychar >='6';  -- 3
SELECT * FROM `tabname`  where  mychar <='6'; -- 4

SELECT * FROM `tabname`  where  mychar >=6;  -- 5
SELECT * FROM `tabname`  where  mychar <=6;     -- 6

 完结!