MySQL LEFT JOIN 未返回所需结果

Question

I have what I think is a simple MySQL issue that I cannot seem to find an answer that applies to what I am doing. I have two tables with a LEFT JOIN. For this example, table 1 will only have 1 row and table 2 will have 3 rows.

TABLE 1: inv_info

id  manufacturer    model   description     quantity
1   SP              A55     USB disk        7

TABLE 2: inv_category

id  categories
1   USB
1   Hard disk
1   SSD

Here is the query:

SELECT manufacturer, model, description, quantity, categories 
FROM inv_info 
LEFT JOIN inv_category ON inv_info.id=inv_category.id 
WHERE manufacturer LIKE '%usb%' 
   OR model LIKE '%usb%' 
   OR description LIKE '%usb%' 
   OR categories LIKE '%usb%'

If my search item is one of the category names, it returns results for each category item, not just the one I searched for. I want it to search all the category rows for this search term, but not return a row for each row in inv_categories.

The results I get from the above query:

manufacturer    model   description     quantity    categories
SP              A55     USB disk        7           SATA
SP              A55     USB disk        7           SSD
SP              A55     USB disk        7           usb

I want it to search both tables, but only return 1 row being data from table 1, not a row of data for each category in table 2.

Desired result:

manufacturer    model   description quantity    categories
SP              A55     USB disk    7           usb

Answer 1

SELECT manufacturer, model, description, quantity, categories 
FROM inv_info 
LEFT JOIN inv_category ON inv_info.id=inv_category.id 
WHERE (    manufacturer LIKE '%usb%' 
        OR model LIKE '%usb%' 
        OR description LIKE '%usb%' )
  AND categories LIKE '%usb%'

---

UPDATE

This query text implicitly converts LEFT JOIN to INNER JOIN due to the condition by the column from inv_category table in WHERE clause.

So correct query text is

SELECT manufacturer, model, description, quantity, categories 
FROM inv_info 
LEFT JOIN inv_category ON inv_info.id=inv_category.id AND categories LIKE '%usb%'
WHERE (    manufacturer LIKE '%usb%' 
        OR model LIKE '%usb%' 
        OR description LIKE '%usb%' )  

or maybe even

SELECT manufacturer, model, description, quantity, categories 
FROM ( SELECT *
       FROM inv_info 
       WHERE (    manufacturer LIKE '%usb%' 
               OR model LIKE '%usb%' 
               OR description LIKE '%usb%' ) ) models
LEFT JOIN ( SELECT *
            FROM inv_category 
            WHERE categories LIKE '%usb%' ) categories USING (id)