Mysql 如何将这些查询整合到一个查询中？

好吧，我要再试一次。。。这一次我肯定做对了。很抱歉搞混了

表1：

表2、表3、表4：

以下是我的主要问题：

现在我想集成这两个查询：

第一个问题：

如果t1.type='type3'，那么

仅当此语句t3.item_id不在。。。在上面的查询中，如果为true，则应显示主查询中的t1.id。但是，如果t3.item_id在。。。那么它应该被排除在结果之外

第二个问题：

如果t1.type='type4'，那么

与第一个查询相同

所有这些是否都适合一个查询？我只需要在一个查询中使用它，这样我就知道下一页要显示哪些结果，例如，在mysql中应用LIMIT 5,5

或：

---

我不确定我是否理解正确，但我认为不应该使用not EXISTS：

SELECT t1.* 
FROM table1 AS t1
  JOIN table2 AS t2 
    ON t2.item_id = t1.item_id
WHERE t2.id = '1' 
  AND t1.type NOT IN ('type1', 'type2')
  AND NOT ( t1.type = 'type3' 
            AND EXISTS 
                ( SELECT t3.item_id
                  FROM table3 AS t3
                  WHERE t3.id = t1.product_id
                    AND t3.item_id NOT IN
                          ( SELECT t2.item_id 
                            FROM table2 AS t2
                            WHERE t2.id = '1' )
                )
           ) 
  AND NOT ( t1.type = 'type4' 
            AND EXISTS 
                ( SELECT t4.item_id
                  FROM table4 AS t4
                  WHERE t4.id = t1.product_id
                    AND t4.item_id NOT IN
                          ( SELECT t2.item_id 
                            FROM table2 AS t2
                            WHERE t2.id = '1' )
                )
           ) 
ORDER BY WhatYouWant
LIMIT x,y

---

好吧，我试试看！谢谢：不是很清楚，但我想你可以用EXISTS关键字。

+----+---------+
| id | item_id |
+----+---------+

$sql = "SELECT t1.* FROM table1 AS t1, table2 AS t2 WHERE t2.id = '1' AND 
t2.item_id = t1.item_id AND t1.type NOT IN ('type1', 'type2') LIMIT 5";

$a = mysql_query($sql);
while($b = mysql_fetch_assoc($a))

SELECT t3.item_id FROM table3 AS t3 WHERE t3.id = t1.product_id AND
t3.item_id NOT IN (SELECT t2.item_id FROM table2 AS t2 WHERE t2.id = '1')

SELECT t4.item_id FROM table4 AS t4 WHERE t4.id = t1.product_id AND
t4.item_id NOT IN (SELECT t2.item_id FROM table2 AS t2 WHERE t2.id = '1')

CASE case_value
    WHEN when_value THEN statement_list
    [WHEN when_value THEN statement_list] ...
    [ELSE statement_list]
END CASE

CASE
    WHEN search_condition THEN statement_list
    [WHEN search_condition THEN statement_list] ...
    [ELSE statement_list]
END CASE

SELECT t1.* 
FROM table1 AS t1
  JOIN table2 AS t2 
    ON t2.item_id = t1.item_id
WHERE t2.id = '1' 
  AND t1.type NOT IN ('type1', 'type2')
  AND NOT ( t1.type = 'type3' 
            AND EXISTS 
                ( SELECT t3.item_id
                  FROM table3 AS t3
                  WHERE t3.id = t1.product_id
                    AND t3.item_id NOT IN
                          ( SELECT t2.item_id 
                            FROM table2 AS t2
                            WHERE t2.id = '1' )
                )
           ) 
  AND NOT ( t1.type = 'type4' 
            AND EXISTS 
                ( SELECT t4.item_id
                  FROM table4 AS t4
                  WHERE t4.id = t1.product_id
                    AND t4.item_id NOT IN
                          ( SELECT t2.item_id 
                            FROM table2 AS t2
                            WHERE t2.id = '1' )
                )
           ) 
ORDER BY WhatYouWant
LIMIT x,y