Question

我只想合并2个表的内容并根据ID显示它。

两个表都有3个条目。

表a-采样顺序

Date Docname Products Quantity ID
1     A       A         1      1
2     B       B         2      1 
3     C       C         3      1

表B-代表位置

Date Area lat long ID
 1    a    1   1   1
 2    b    2   2   1
 3    c    3   3   1

输出应生成3行，其中所有表A列和B列（其中ID =指定的ID）

我需要这样的输出

Date Docname product Quantity Area lat long
1      A       A       1       a    1   1
2      B       B       2       b    2   2
3      C       C       3       c    3   3

但是它会生成9行（3 * 3）并复制两个表中存在的行数。它的产生

Date Docname product Quantity Area lat long
1      A       A       1       a    1   1
2      B       B       2       b    2   2
3      C       C       3       c    3   3
1      A       A       1       a    1   1
2      B       B       2       b    2   2
3      C       C       3       c    3   3
1      A       A       1       a    1   1
2      B       B       2       b    2   2
3      C       C       3       c    3   3

梳理A * B中的行数-关于ID我只需要3行。

查询-

$Report = DB::table('sampling_order')
             ->join('representativelocations','representativelocations.representativeid','=','sampling_order.representativeid')
             ->select('sampling_order.representativeid as representativeid',
             'sampling_order.date as date',
             'sampling_order.doctor_name as doctor_name',
             'sampling_order.products as products',
             'sampling_order.quantity as quantity',
             'representativelocations.latitude as latitude',
             'representativelocations.longitude as longitude',
             'representativelocations.area as area')
             ->whereBetween('sampling_order.date', [$Datefrom, $Dateto])
             ->where('sampling_order.representativeid','=',$Representativeid)->get();

Answer 1

根据要求，我认为您应该按以下方式尝试加入date而不是ID。如您所愿，这将返回3行。

select so.date,so.Docname,so.products,so.Quantity,rl.Area,rl.lat,rl.long from Sampling_order AS so
INNER JOIN  Representative_locations as rl ON so.Date = rl.Date
WHERE so.ID = 1

根据需要更改表名和列名。

Answer 2

我看到的是，两个表中的所有Id均为“ 1”，因此结果应为3 * 3 = 9行。我想您可能想要这样：

id产品区域-A区域-B区域-C

1 ____ A ____ 1 ____ 2 _____ 3

1 ____ B ____ 2 ____ 3 _____ 4

如果是这样。您需要加入三遍。

SELECT * FROM A
LEFT JOIN (SELECT *, area AS area-A FROM B WHERE area = 'a' ) AS B ON B.id = A.id
LEFT JOIN (SELECT *, area AS area-B FROM B WHERE area = 'b' ) AS C ON C.id = A.id
LEFT JOIN (SELECT *, area AS area-C FROM B WHERE area = 'c' ) AS D ON D.id = A.id

希望这就是您想要的。

联接表在laravel中创建重复项

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