PHP|MYSQL 查询：比较两个表字段，如果匹配，则插入|覆盖一个字段的值

Question

I've got 2 tables :

• jos_tempcsv , which contains among others the following field: Category of goods

• jos_categories , which contains among others the following fields: Category_id , slug

I would like to create the following query:

I've got a table called jos_tempcsv which contains a field called Category of goods . This field contains alphanumeric values that needs to be changed in a numeric value.

I need to compare the value of the Category of goods field of the jos_tempcsv table with the value of the slug field of the jos_categories table.

If comparison matches, then I would like to insert the value contained in the Category_id field of the jos_categories table into the Category of goods field of the jos_tempcsv table (it should overwrite the initial value with a numeric value).

Answer 1

Find a solution which works, record are updated|overwritten :

$sql = "update jos_tempcsv u left join jos_virtuemart_categories_fr_fr c on c.slug=u.`Category of goods` set u.`Category of goods`=c.virtuemart_category_id;

if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . $conn->error;
}

Thank you to @PRANAV and a special thanks to @Abdulla which has a great sens of humor