Question

我有一个包含以下字段的表：

日期，时间，课程，或，L1R，L2R，L3R

如果一个组（时间）在L3Ra列中不包含值“ 0”，我只想返回值。

我尝试了以下语句，但只删除了我希望删除整个组的那些包含“ 0”的值

  SELECT *
FROM orclass t
WHERE t.l3r NOT IN
   (SELECT s.l3r  
    FROM  orclass s
    WHERE s.l3r = '0')
    and Thedate = "2019-01-18"
ORDER BY t.Thetime

我想做的是删除L3R列中所有包含“ 0”的组（时间）。

Thetime L1R L2R L3R
  12:00  1     2   1
  12:00  1     2   0
  13:00  1     1   1
  13:00  2     0   8
  14:00  2     4   9
  14:00  0     3   6

将成为：

Thetime L1R L2R L3R
  13:00  1     1   1
  13:00  2     0   8
  14:00  2     4   9
  14:00  0     3   6

因为组12:00在LR3中包含“ 0”

Answer 1

您可以使用此：

SELECT *
FROM orclass o
WHERE Thedate = "2019-01-18"
    AND NOT EXISTS
    (
        SELECT 1
        FROM  orclass o1
        WHERE o1.Thedate = o.Thedate 
            AND o1.Thetime = o.Thetime 
            AND o1.lr3 = '0'
    )
ORDER BY Thetime;

Answer 2

您只需要将第一个where子句更改为t.thetime而不是t.l3r，就像这样：

SELECT *
FROM orclass t
WHERE t.Thetime NOT IN
   (SELECT s.Thetime 
    FROM  orclass s
    WHERE s.l3r = '0')
    and Thedate = "2019-01-18"
ORDER BY t.Thetime

Answer 3

我们可以使用EXISTS子句进行检查：

SELECT
    s1.Thetime,
    s1.L1R,
    s1.L2R,
    s1.L3R
FROM orclass s1
WHERE NOT EXISTS (SELECT 1 FROM orclass s2
                  WHERE s1.Thetime = s2.Thetime AND s2.L3R = 0);

Demo

Answer 4

使用相关子查询

select t1.* from table_name t1 
where  not exists ( select 1 from table_name t2 where t2.Thetime=t1.Thetime
                                and L3R =0)

如何从表中选择组不包含值的行

4 个答案:

Demo