得到这么多记录的表的左连接。php-pdo-mysql

我留下了10个表的连接，其中4个表有3行，其余的只有一行。我想获取10个表中的所有行，因此我使用了

左连接

，如果其中一个表没有记录，将返回一些内容。目前我的表由1行组成，除了4个表，每个表有3行，所以我希望总共有12行。但是当我回显

rowCount（）

时，我得到了

81行

它的

更像是3x3x3x3

为什么会发生这种情况

如何按顺序进行正确的select查询或获得所需的12行

如有任何建议，我们将不胜感激

FYI

还尝试了union，但我认为这在我的情况下是不可能的，我只需要记录，如果它们存在，因为我知道若有空表，union将添加null值

添加信息

t1.pin作为pin存在于t1.1中

t1.pin存在于t2中，如表2所示（t2中有列pin，然后存在于t2.1中）

t2.pin作为pin存在于t2.1中

t2.pin作为pin存在于t2.2中

t1.pin在t3中以表3_pin的形式存在（t3中有列pin，该列随后存在于t3.1中）

t3.pin作为pin存在于t3.1中

t3.pin作为pin存在于t3.2中

t1.pin作为pin存在于t4中

t1.pin在t4.1中作为pin存在

更新

我想要实现的是从表中获取所有数据，这些数据将满足我放入

的示例中的where子句，比如1

。简言之，我希望获得表中的所有数据

"SELECT *,t1.pin AS table1.1pin"
        . ",t3.pin AS table2.1pin"
        . ",t6.pin AS table3.1pin"
        . ",t9.pin AS table4.1pin"
        . ",t2.tin AS table1.1tin"
        . ",t2.first_name AS table1.1firstname"
        . ",t2.last_name AS table1.1lastname"
        . ",t2.middle_name AS table1.1middlename"
        . ",t2.suffix AS table1.1suffix"
        . ",t5.tin AS table2.1tin"
        . ",t5.first_name AS table2.1firstname"
        . ",t5.last_name AS table2.1lastname"
        . ",t5.middle_name AS table2.1middlename"
        . ",t5.suffix AS table2.1suffix"
        . ",t8.tin AS table3.1tin"
        . ",t8.first_name AS table3.1firstname"
        . ",t8.last_name AS table3.1lastname"
        . ",t8.middle_name AS table3.1middlename"
        . ",t8.suffix AS table3.1suffix"
        . ",t10.tin AS table4.1tin"
        . ",t10.first_name AS table4.1firstname"
        . ",t10.last_name AS table4.1lastname"
        . ",t10.middle_name AS table4.1middlename"
        . ",t10.suffix AS table4.1suffix"
        . ",t1.effectivity_qtr AS table1qtr"
        . ",t1.effectivity_year AS table1year"
        . ",t4.effectivity_qtr AS table2qtr"
        . ",t4.effectivity_year AS table2year"
        . ",t7.effectivity_qtr AS table3qtr"
        . ",t7.effectivity_year AS table3year"
        . ",t9.effectivity_qtr AS table4qtr"
        . ",t9.effectivity_year AS table4year"
        . " FROM "
        . "table1 AS t1 "
        . "LEFT JOIN table1.1 AS t2 ON t1.pin = t2.pin AND t1.status = t2.status "
        . "LEFT JOIN table2 AS t3 ON t1.pin= t3.table2_pin AND t1.status = t3.status "
        . "LEFT JOIN table2.1 AS t4 ON t3.pin = t4.pin AND t3.status = t4.status "
        . "LEFT JOIN table2.2 AS t5 ON t3.pin = t5.pin AND t3.status = t5.status "
        . "LEFT JOIN table3 AS t6 ON t1.pin = t6.table3_pin AND t1.status = t6.status "
        . "LEFT JOIN table3.1 AS t7 ON t6.pin = t7.pin AND t6.status = t7.status "
        . "LEFT JOIN table3.2 AS t8 ON t6.pin = t8.pin AND t6.status = t8.status "
        . "LEFT JOIN table4 AS t9 ON t1.pin = t9.pin AND t1.status = t9.status "
        . "LEFT JOIN table4.1 AS t10 ON t1.pin = t10.pin AND t1.status = t10.status "
        . "WHERE "
        . "t1.pin LIKE '%$pin%' AND t1.status = 'Active' ";

更新的预期输出

pin                          effectivity_qtr    effectivity_year    status      tin             last_name   first_name  middle_name suffix      
015-08-0011-000-01           1st                2013                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01           1st                2014                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01           1st                2015                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01-1001      1st                2013                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01-1001      1st                2014                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01-1001      1st                2015                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01-2001      1st                2013                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01-2001      1st                2014                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01-2001      1st                2015                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01           1st                2013                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01           1st                2014                Active      342-432-423-000 Smith       John        James       Jr  
015-08-0011-000-01           1st                2015                Active      342-432-423-000 Smith       John        James       Jr  

我发布的第一个预期输出肯定引起了混乱，所以我决定发布另一个。这是直接从sqlfiddle得到的，我刚刚调整了几个不正确的值。我想每年获得所有数据。我希望这一点现在已经清楚了

---

我愿意接受任何其他select查询，只要我每年都能获得所有数据。要考虑的是，在某些表中，PIN可以是多个，有些表可以是空的。

联接创建表的交叉乘积。在您的情况下，有多行具有相同的值

pin

，因此联接的工作方式如下：

sysid   pin effectivity_qtr effectivity_year    status  sys_id  tin pin last_name   first_name  middle_name suffix  status  sys_id  pin table2_pin  status  sysid   pin effectivity_qtr effectivity_year    status  sys_id  tin pin last_name   first_name  middle_name suffix  status  sys_id  pin table3_pin  status  sys_id  pin status  effectivity_qtr effectivity_year    sys_id  tin pin last_name   first_name  middle_name suffix  status  sys_id  pin status  effectivity_qtr effectivity_year    sys_id  tin pin last_name   first_name  suffix  middle_name status  pin pin pin pin tin first_name  last_name   middle_name suffix  tin first_name  last_name   middle_name suffix  tin first_name  last_name   middle_name suffix  tin first_name  last_name   middle_name suffix  effectivity_qtr effectivity_year    effectivity_qtr effectivity_year    effectivity_qtr effectivity_year    effectivity_qtr effectivity_year
1   015-08-0011-000-01  1st 2013    Active  1   342-432-423-000 015-08-0011-000-01  Smith   John    James   Jr  Active  1   015-08-0011-000-01-1001 015-08-0011-000-01  Active  1   015-08-0011-000-01-1001 1st 2013    Active  1   342-432-423-000 015-08-0011-000-01-1001 Smith   John    James   Jr  Active  1   015-08-0011-000-01-2001 015-08-0011-000-01  Active  1   015-08-0011-000-01-2001 Active  1st 2013    1   342-432-423-000 015-08-0011-000-01-2001 Smith   John    James   Jr  Active  1   015-08-0011-000-01  Active  1st 2013    1   342-432-423-000 015-08-0011-000-01  Smith   John    Jr  James   Active  015-08-0011-000-01  015-08-0011-000-01-1001 015-08-0011-000-01-2001 015-08-0011-000-01  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  1st 2013    1st 2013    1st 2013    1st 2013
2   015-08-0011-000-01  1st 2014    Active  1   342-432-423-000 015-08-0011-000-01  Smith   John    James   Jr  Active  1   015-08-0011-000-01-1001 015-08-0011-000-01  Active  1   015-08-0011-000-01-1001 1st 2014    Active  1   342-432-423-000 015-08-0011-000-01-1001 Smith   John    James   Jr  Active  1   015-08-0011-000-01-2001 015-08-0011-000-01  Active  1   015-08-0011-000-01-2001 Active  1st 2014    1   342-432-423-000 015-08-0011-000-01-2001 Smith   John    James   Jr  Active  1   015-08-0011-000-01  Active  1st 2014    1   342-432-423-000 015-08-0011-000-01  Smith   John    Jr  James   Active  015-08-0011-000-01  015-08-0011-000-01-1001 015-08-0011-000-01-2001 015-08-0011-000-01  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  1st 2014    1st 2014    1st 2014    1st 2014
3   015-08-0011-000-01  1st 2015    Active  1   342-432-423-000 015-08-0011-000-01  Smith   John    James   Jr  Active  1   015-08-0011-000-01-1001 015-08-0011-000-01  Active  1   015-08-0011-000-01-1001 1st 2015    Active  1   342-432-423-000 015-08-0011-000-01-1001 Smith   John    James   Jr  Active  1   015-08-0011-000-01-2001 015-08-0011-000-01  Active  1   015-08-0011-000-01-2001 Active  1st 2015    1   342-432-423-000 015-08-0011-000-01-2001 Smith   John    James   Jr  Active  1   015-08-0011-000-01  Active  1st 2015    1   342-432-423-000 015-08-0011-000-01  Smith   John    Jr  James   Active  015-08-0011-000-01  015-08-0011-000-01-1001 015-08-0011-000-01-2001 015-08-0011-000-01  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  342-432-423-000 John    Smith   James   Jr  1st 2015    1st 2015    1st 2015    1st 2015
 Record Count: 3; Execution Time: 8ms View Execution Plan  link
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要在

表1

中每个条目仅显示一行，在查询结束时添加

GROUP BY t1.sysid

。

在选择之后使用DISTINCT关键字………

选择DISTINCT t1.pin AS

我这样做了，我删除了

*

我仍然得到81行如果你创建了SQLFIDLE，我可以帮助你。我在哪里可以创建SQLFIDLE？对不起，我没有这样做，你可以发布一个链接吗？先生，可能有一个链接表1中每个条目有多个条目的可能性是否有其他方法？使用唯一标识符作为外键，而不是pin？sir pin在每个表中都是唯一的，没有其他行会有pin。别针是外键，我做的。请告诉我pin（第二列）是如何唯一的：

（1，'015-08-0011-000-01'，'1'，'2013'，'Active'），（2，'015-08-0011-000-01'，'1'，'2014'，'Active'），（3，'015-08-0011-000-01'，'1'，'2015'，'Active'）对不起，我完全忘记了那个表。在有名称的表中，也可以有多个pin。我的问题是，当我尝试使用sysid时，它为什么不起作用（这一个是唯一的，因为它是自动递增的）我得到的不是完整的年份我只得到其他表的2013年只有表1有完整的年份
table1                          table2_                             table3__                  
                                                                                              
                                1. 015-08-0011-000-01-1001 +------> 1. 015-08-0011-000-01-1001
1. 015-08-0011-000-01-1001 +--> 2. 015|08|0011|000|01|1001+-----+   2. 015|08|0011|000|01|1001
                                3. 015-08-0011-000-01-1001 +-+  |   3. 015-08-0011-000-01-1001
                                                             |  |                             
                                1. 015-08-0011-000-01-1001   |  |   1. 015-08-0011-000-01-1001
2. 015-08-0011-000-01-1001 +--> 2. 015|08|0011|000|01|1001   |  +-> 2. 015|08|0011|000|01|1001
                                3. 015-08-0011-000-01-1001   |      3. 015-08-0011-000-01-1001
                                                             |                                
                                1. 015-08-0011-000-01-1001   |      1. 015-08-0011-000-01-1001
3. 015-08-0011-000-01-1001 +--> 2. 015|08|0011|000|01|1001   +----> 2. 015|08|0011|000|01|1001
                                3. 015-08-0011-000-01-1001          3. 015-08-0011-000-01-1001
                                                                                              
                                                                                              
                                                                                              
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