Question

我有2张桌子，桌子1＆amp;表2。

table1有字段：

id
atype
adesc
aid

table2有字段：

id
aid
adesc
value_1
value_2

$query1 = mysql_query("Select DISTINCT atype from table1");
while($row = mysql_fetch_array($query1)){
    $atype = $row['atype'];
    $query2 = mysql_query("Select adesc from table1 where atype='$atype' and aid IN (Select aid from table2 ) order by id asc");
    while($row2 = mysql_fetch_array($query2)){
        // i know query2 can only get adesc, so i need value_1 and value_2 in this
        echo $row2['adesc'] .'>> '. (this should be value1 from table2) .'>> '. (this should be value2 from table2);
    }
}

我也希望获得value_1和value_2。任何帮助将不胜感激。

修改
table1值在我的数据库中（atype，aid，adesc）：

type1 111 'this is type 1'
type1 111 'this is type 1'
type2 112 'this is type 2'
type3 113 'this is type 3'
type4 114 'this is type 4'
type1 111 'this is type 1'
type4 114 'this is type 4'
type2 112 'this is type 2'

我的table2上的

值（辅助，adesc，val1，val2）：

111  'this is type 1' 100 50
111  'this is type 1' 100 50
112  'this is type 2' 300 500
113  'this is type 3' 100 50
112  'this is type 2' 100 50
114  'this is type 4' 100 50
111  'this is type 1' 100 50

我真正想要的是：

type1
      (sum)value_1 (sum)value_2
type2 
      (sum)value_1 (sum)value_2
type3
      (sum)value_1 (sum)value_2
type4
      (sum)value_1 (sum)value_2

Answer 1

    $query2 = mysql_query("Select t1.adesc, t2.value_1, t2.value_2 from table1 as t1, table2 as t2 where t1.atype='$atype' and t1.aid = t2.aid order by t1.id asc");

    while($row2 = mysql_fetch_array($query2)){
        // i know query2 can only get adesc, so i need value_1 and value_2 in this
        echo $row2['adesc'] .'>> '. $row2['value_1'] .'>> '. $row2['value_2'];
    }

UPD：

$sql = <<<SQL
select t1.adesc, sum(t2.value_1) as v1, sum(t2.value_2)  as v2
from 
table1 as t1,
table2 as t2

where 
t1.aid = t2.aid 
group by t1.atype

order by t1.atype asc
SQL;
$query = mysql_query($sql);
while($row = mysql_fetch_array($query2)){
    // i know query2 can only get adesc, so i need value_1 and value_2 in this
        echo $row['adesc'] .'>> '. $row['v1']  .'>> '. $row['v2'];
}

Answer 2

在SQL中使用一个简单的内连接，而不是两个选择：

select table1.adesc,atable2.value1 from table1,table2 where table2.adesc=table1.adesc and table1.aid=table2.aid order by table1.aid asc

编辑：

select table1.adesc,atable2.value1 from table1,table2 where table1.aid=table2.aid order by table1.aid asc

Answer 3

此SQL查询应生成所需的结果：

select adesc, 
       value_1, 
       value_2 

from   table1 

where  atype='$atype' and 
       aid IN (Select aid from table2 ) 

order by id asc

SQL查询，我需要获取一些值

3 个答案: