联接表更新的替代SQL语法

Question

I need alternative syntax for my sql, to deduct the qty from another table to my raw material table

$sql3 = "UPDATE material_inventory 
         join product_check 
         ON material_inventory.qty = material_inventory.qty 
         SET material_inventory.qty = material_inventory.qty - product_check.qty 
         WHERE product_check.pc_id = '$id' 
         AND product_check.date2 = '$date' 
         LIMIT 1";
$result3 = mysqli_query($conn,$sql3);

It looks like limit doesn't work in join update with join clause. anyway thanks

Answer 1

Looks like your ON condition is wrong. Until you add schema of relevant tables, all I can suggest from given scenario is following query:

$sql3 = "UPDATE material_inventory 
         join product_check 
         ON material_inventory.qty = product_check.qty        //modified line
         SET material_inventory.qty = material_inventory.qty - product_check.qty 
         WHERE product_check.pc_id = '$id' 
         AND product_check.date2 = '$date' 
         LIMIT 1";
$result3 = mysqli_query($conn,$sql3);

If the above query doesn't get the desired output, please add schema so that I can provide more accurate solution.