Question

表名是Sample

id name   status date 
1 ddd     1 2015-03-11 
2 dddd    1 2015-03-12 
3 dfdfgfg 0 2015-03-11 
4 ererre  1 2015-03-19 
5 eeeerer 0 2015-03-03

这是表格， - 这是我要添加的查询以获得结果。我希望表中的结果如果状态设置为1则日期不应该过期，如果状态为零则不需要条件。所以它应该显示。所以我做了这样的查询

select * from sample where status='1' AND date>Now() OR status='0'

我得到的结果是正确的

3 dfdfgfg 0 2015-03-11
4 ererre 1 2015-03-19
5 eeeerer 0 2015-03-03

但我想添加更多查询，我如何为上述查询添加更多条件？

Answer 1

您必须将旧条件和新条件放在括号中，然后使用AND来链接它们：

select * from sample 
 where (status='1' AND date>Now() OR status='0') 
   AND (new condition 1) 
   AND (new condition 2) ...

Answer 2

SELECT * FROM TABLE_NAME WHERE expiry_date > NOW()

Answer 3

尝试使用Union / Union All，只要满足您的要求

包含数据示例的示例代码

create table sample(id INT,name CHAR(10),  status INT, date_e DATE);

INSERT INTO sample VALUES(1, 'ddd',1,'2015-03-11');
INSERT INTO sample VALUES(2, 'dddd',1,'2015-03-12');
INSERT INTO sample VALUES(3, 'dfdfgfg',0,'2015-03-11');
INSERT INTO sample VALUES(4, 'ererre',1,'2015-03-19');
INSERT INTO sample VALUES(5, 'eeeerer',0,'2015-03-03');


SELECT * FROM sample;
+------+---------+--------+------------+
| id   | name    | status | date_e     |
+------+---------+--------+------------+
|    1 | ddd     |      1 | 2015-03-11 |
|    2 | dddd    |      1 | 2015-03-12 |
|    3 | dfdfgfg |      0 | 2015-03-11 |
|    4 | ererre  |      1 | 2015-03-19 |
|    5 | eeeerer |      0 | 2015-03-03 |
+------+---------+--------+------------+
5 rows in set (0.00 sec)


mysql> select * from sample where status='1' AND date_e>Now()
    -> UNION ALL
    -> select * from sample where status='0';
+------+---------+--------+------------+
| id   | name    | status | date_e     |
+------+---------+--------+------------+
|    4 | ererre  |      1 | 2015-03-19 |
|    3 | dfdfgfg |      0 | 2015-03-11 |
|    5 | eeeerer |      0 | 2015-03-03 |
+------+---------+--------+------------+
3 rows in set (0.00 sec)

我如何为mysql查询添加更多条件？

3 个答案: