Question

有没有办法按如下方式过滤结果：

数据集：

ID          NAME            VALUE
-----------------------------------------
23          Test            TRUE
24          Test            FALSE
25          Test            FALSE
26          Test            TRUE
27          Test            FALSE
28          Test            FALSE

结果应该是：

ID          NAME            VALUE
-----------------------------------------
23          Test            TRUE
24          Test            FALSE
26          Test            TRUE
27          Test            FALSE

我们的想法是返回值为TRUE的所有行以及在true

之后返回值为false的第一行

Answer 1

可能只有将表再次连接到同一个表时，只有这个sql的问题是它需要有不间断的ID

数据

id    name    value   
1     TEST    1   
2     TEST    0   
3     TEST    0   
4     TEST    0   
5     TEST    1   
6     TEST    1   
7     TEST    0   
8     TEST    0   
9     TEST    1

根据下一行的ID加入同一个表，然后根据值true/1或当前行t1.value=0以及之前t2.value = 1

的表中的所有行加入

SELECT t1.* FROM table as t1 
LEFT JOIN table t2 ON t1.id = t2.id + 1 
WHERE ( ( t1.value = 1 ) OR ( t1.value = 0 AND t2.value = 1 ) )
ORDER BY t1.id

结果

id    name    value   
1     TEST    1   
2     TEST    0   
5     TEST    1   
6     TEST    1   
7     TEST    0   
9     TEST    1

编辑：我的最后机会，虽然不确定性能但非连续ID正在使用此

SELECT * FROM my_table as t1 
LEFT JOIN my_table t2 ON
t2.id = (
   SELECT MAX(my_table.id) FROM my_table
   WHERE my_table.id < t1.id ORDER BY id asc LIMIT 1
) 
WHERE (t1.value=1) OR (t1.value=0 AND t2.value=1) order by t1.id asc

Answer 2

我想这可以通过自我加入完成，例如：

   SELECT ID, NAME, VALUE
     FROM table
    WHERE VALUE = "TRUE"
UNION ALL
   SELECT t2.ID, t2.NAME, t2.VALUE
     FROM table t1
     JOIN table t2
       ON t1.ID +1 = t2.ID
      AND t1.VALUE = "TRUE"
      AND t2.VALUE = "FALSE"

编辑：这也适用于非破坏ID，因此不适用于OP案例

Answer 3

E.g：

DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(id INT NOT NULL AUTO_INCREMENT PRIMARY KEY
,name VARCHAR(12) NOT NULL
,value TINYINT NOT NULL
);

INSERT INTO my_table VALUES
(23,'Test',TRUE),
(24,'Test',FALSE),
(25,'Test',FALSE),
(26,'Test',TRUE),
(27,'Test',FALSE),
(28,'Test',FALSE);

SELECT a.* 
  FROM my_table a 
  JOIN 
     ( SELECT x.*
            , MIN(y.id) minid 
         FROM my_table x 
         JOIN my_table y 
           ON y.id > x.id 
          AND y.value = FALSE 
        WHERE x.value = TRUE 
        GROUP 
           BY x.id
     ) b 
    ON a.id IN (b.id,b.minid);
+----+------+-------+
| id | name | value |
+----+------+-------+
| 23 | Test |     1 |
| 24 | Test |     0 |
| 26 | Test |     1 |
| 27 | Test |     0 |
+----+------+-------+

Mysql结果数据集过滤器问题

3 个答案: