Sql将值从一列移动到两列不同的列

Question

My problem is as follows - in the database I have a Products table with a size column. However, I have now created two new columns x_size and y_size and I wanted to move the values from the size column to these 2 columns. For example, in the database I have a record, where the size column value is 100x200, now I want to transfer '100' to the new x_size column and '200' to the y_size column, and so for each of the records in this table.

I was trying with :

UPDATE `post` SET `x_size `=`size`
UPDATE `post` SET `y_size `=`size`

But this updates the value of the entire size column, not just part of it. I will be grateful for your help

Answer 1

If you have multiple records that you want to transfer from size column, you could do fetch all the records from your table, and then split your size values using PHP explode() function. Since you tagged Laravel, here's the simple Laravel solution:

$products = Products::get();
foreach ($products as $product){
    $size = explode('x', $product->size);
    $product->x_size = $size[0]; //First element from exploded array
    $product->y_size = $size[1]; //Second element from exploded array
    $product->save();
 }

Tinker output:

>>> $size = '100x200';
=> "100x200"
>>> $exlpodedArray = explode('x', $size);
=> [
     "100",
     "200",
   ]
>>> $x_size = $exlpodedArray[0];
=> "100"
>>> $y_size = $exlpodedArray[1];
=> "200"

Answer 2

You can use substring_index() :

UPDATE post
    SET x_size = substring_index(size, 'x', 1),
        y_size = substring_index(size, 'x', -1)