MySQL - 删除不在 find_in_set 中的位置 [英] MySQL - delete where not in find_in_set

问题描述

我正在尝试找到正确的语法来删除不在逗号分隔行中的记录.

表 A

<代码>|身份证 |product_id |属性_id ||----|------------|--------------||1 |123 |45 ||2 |123 |46 ||3 |124 |34 ||4 |124 |33 |

表 B

<代码>|代码 |轴 ||------|-------||123 |45,46 ||124 |34 |

我的目标是从表 A 中删除属性 id 不在表 B 轴值中的所有行(在本例中为 id = 4 的行).

我之前尝试做一个SELECT:

SELECT A.attribute_id, A.product_idFROM tableA as ALEFT JOIN (SELECT * FROM tableB) AS BON FIND_IN_SET(A.attribute_id, B.`axis`)

但没有任何运气.

我该怎么做?

解决方案

您可以尝试以下SELECT数据:

SELECT A.attribute_id, A.product_idFROM tableA AS A LEFT JOIN tableB AS B ON A.product_id = B.codeWHERE IFNULL(FIND_IN_SET(A.attribute_id, B.Axis), 0) = 0

您可以使用以下内容DELETE表A上的行(基于SELECT):

DELETE FROM tableA WHERE id IN (选择 A.idFROM tableA AS A LEFT JOIN tableB AS B ON A.product_id = B.codeWHERE IFNULL(FIND_IN_SET(A.attribute_id, B.Axis), 0) = 0)

<块引用>

演示: http://sqlfiddle.com/#!9/3a3e13/6/0

I'm trying to find the right syntax to delete records that are not in a comma separated row.

table A

| id | product_id | attribute_id |
|----|------------|--------------|
| 1  | 123        | 45           |
| 2  | 123        | 46           |
| 3  | 124        | 34           |
| 4  | 124        | 33           |

table B

| code | Axis  |
|------|-------|
| 123  | 45,46 |
| 124  | 34    |

My goal is to remove all rows from table A where the attribute id is not in the table B axis value (in this example the row with id = 4).

I try to do a SELECT before:

SELECT A.attribute_id, A.product_id
FROM tableA as A
LEFT JOIN (SELECT * FROM tableB) AS B
ON FIND_IN_SET(A.attribute_id, B.`axis`)

But without any luck.

How can I do this?

解决方案

You can try the following to SELECT the data:

SELECT A.attribute_id, A.product_id 
FROM tableA AS A LEFT JOIN tableB AS B ON A.product_id = B.code
WHERE IFNULL(FIND_IN_SET(A.attribute_id, B.Axis), 0) = 0

You can use the following to DELETE the rows on table A (based on SELECT):

DELETE FROM tableA WHERE id IN (
    SELECT A.id 
    FROM tableA AS A LEFT JOIN tableB AS B ON A.product_id = B.code
    WHERE IFNULL(FIND_IN_SET(A.attribute_id, B.Axis), 0) = 0
)

demo: http://sqlfiddle.com/#!9/3a3e13/6/0

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