将数据从一个 table 复制到另一个，但添加第二个 WHERE 子句不会插入数据

Question

我有两个 table。当用户单击一个按钮时，它会将数据从 table 1 复制到 table 2，其中 table 2 中尚不存在 table 2。

我的查询运行得很好，直到我在第一个 table 中添加了一个名为 "onsite" 的新列 - 它要么设置为 yes，要么为 NULL。

这是我试过的查询。它不再将任何数据插入 past_bidder table (table 2)

$copybidderquery = "INSERT INTO past_bidders(bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created) 
SELECT bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created 
FROM bidders 
WHERE (bidfname, bidlname, bidphnum, bidlicense, bidaddress) 
NOT IN (SELECT bidfname, bidlname, bidphnum, bidlicense, bidaddress FROM past_bidders) 
AND onsite != 'yes'";

我也试过将 where onsite != 'yes' 移到 "WHERE" 之后，它仍然做同样的事情。

$copybidderquery = "INSERT INTO past_bidders(bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created) 
SELECT bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created 
FROM bidders 
WHERE onsite != 'yes'
AND (bidfname, bidlname, bidphnum, bidlicense, bidaddress) 
NOT IN (SELECT bidfname, bidlname, bidphnum, bidlicense, bidaddress FROM past_bidders)";

如前所述，此查询在没有 "onsite != 'yes'" 行的情况下也能正常工作。

我认为这只是我忽略的一些小语法错误。任何帮助将不胜感激。

Answer 1

INSERT INTO past_bidders(bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created) 
SELECT bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created 
FROM bidders 
WHERE  onsite is NULL AND (bidfname, bidlname, bidphnum, bidlicense, bidaddress) 
NOT IN (SELECT bidfname, bidlname, bidphnum, bidlicense, bidaddress FROM past_bidders) 
;

检查以下示例，当您说不等于某物时，它不会 return 空值

mysql> select * from calls;
+----+------------+---------+
| id | date       | user_id |
+----+------------+---------+
|  1 | 2016-06-22 |       1 |
|  2 | 2016-06-22 |    NULL |
|  3 | 2016-06-22 |    NULL |
|  4 | 2016-06-23 |       2 |
|  5 | 2016-06-23 |       1 |
|  6 | 2016-06-23 |       1 |
|  7 | 2016-06-23 |    NULL |
+----+------------+---------+
7 rows in set (0.00 sec)

mysql> select * from calls where user_id!=1;
+----+------------+---------+
| id | date       | user_id |
+----+------------+---------+
|  4 | 2016-06-23 |       2 |
+----+------------+---------+
1 row in set (0.00 sec)

mysql> select * from calls where user_id is null;
+----+------------+---------+
| id | date       | user_id |
+----+------------+---------+
|  2 | 2016-06-22 |    NULL |
|  3 | 2016-06-22 |    NULL |
|  7 | 2016-06-23 |    NULL |
+----+------------+---------+
3 rows in set (0.00 sec)

Answer 2

可能存在隐藏字符或值不是 'yes' 或者您也应该检查是否为非空值

$copybidderquery = "INSERT INTO past_bidders(bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created) 
                                  SELECT bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created 
                FROM bidders 
                WHERE (bidfname, bidlname, bidphnum, bidlicense, bidaddress) 
                NOT IN (SELECT bidfname, bidlname, bidphnum, bidlicense, bidaddress FROM past_bidders) 
                AND trim(lower(onsite) )!= 'yes';

Answer 3

!= returns NULL 当任一值为 NULL 时。您有两个选择：

SELECT bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created 
FROM bidders 
WHERE (bidfname, bidlname, bidphnum, bidlicense, bidaddress) NOT IN
          (SELECT bidfname, bidlname, bidphnum, bidlicense, bidaddress
           FROM past_bidders
          ) AND
      onsite is null;

或者，使用 NULL 安全相等：

SELECT bidnum, bidfname, bidlname, bidphnum, bidlicense, bidaddress, bidtaxexempt, bidtaxid, date_created 
FROM bidders 
WHERE (bidfname, bidlname, bidphnum, bidlicense, bidaddress) NOT IN
          (SELECT bidfname, bidlname, bidphnum, bidlicense, bidaddress
           FROM past_bidders
          ) AND
      (NOT onsite <=> 'yes');

将数据从一个 table 复制到另一个，但添加第二个 WHERE 子句不会插入数据

Copy data from one table to another but adding 2nd WHERE clause won't insert data

php

mysql

where-clause