Question

我需要从两个表中选择数据。但是有两列，如果一行或两行读为NO，我想跳过它。

表1

a--b--c-
1  r  l
2  t  f
3  d  c

表2

d--e--f--g-
1  r NO NO
2  r YES NO
3  r YES YES

QUERY：

 SELECT
    talbe1.a,
    table1.b,
    table1.c,
    table2.d,
    table2.e,
    table2.f,
    table2.g,
    FROM table1 INNER JOIN 
    table2 on table1.b = table2.e
    WHERE 'no' NOT IN (SELECT table2.f, table2.g FROM table2)

Answer 1

应该这么简单：

  SELECT
    talbe1.a,
    table1.b,
    table1.c,
    table2.d,
    table2.e,
    table2.f,
    table2.g,
  FROM table1 INNER JOIN 
        table2 on table1.b = table2.e
  WHERE table2.f <> 'NO' AND table2.g <> 'NO'

Answer 2

试试这个：

SELECT
  table1.a,
  table1.b,
  table1.c,
  table2.d,
  table2.e,
  table2.f,
  table2.g,
FROM table1 
LEFT JOIN table2 ON table1.b = table2.e
WHERE table2.f <> 'NO' AND table2.g <> 'NO'

还不确定你的表的结构，但你有没有理由加入table1.b = table2.e？

Answer 3

为什么不说f = g和g ='YES'？

Answer 4

SELECT
    talbe1.a,
    table1.b,
    table1.c,
    table2.d,
    table2.e,
    table2.f,
    table2.g,
    FROM table1 INNER JOIN 
    table2 on table1.b = table2.e
        //if any of the f or g are not eqaul to "NO" only then select the result
        WHERE (table2.f != 'NO' AND table2.g != 'NO')

does not return if 
f = no and g = no
f = no and g = yes
f = yes and g = no

does return if
f = yes and g = yes

Answer 5

怎么样：

WHERE (table2.f <> 'no' AND table2.g <> 'no')

Answer 6

您必须使用LEFT JOIN而不是INNER JOIN

SELECT
    talbe1.a,
    table1.b,
    table1.c,
    table2.d,
    table2.e,
    table2.f,
    table2.g,
  FROM table1 LEFT JOIN 
        table2 on table1.b = table2.e
WHERE table2.f <> 'NO' AND table2.g <> 'NO'

跳过某些行的select语句

6 个答案: