php - 在更新语句中使用 where 子选择

Question

如何在一个单一的 SQL 语句中制作这个 PHP 脚本？

$sql = 'SELECT oxtprice from oxarticles where oxparentid = ? and nrseriesarticle = 1';
        $price = DatabaseProvider::getDb()->getOne($sql, [$id]);

        if ($price) {
            $updateSql = "Update oxarticles SET nrseriestprice = ? WHERE oxid = ? and oxparentid = ''";
            DatabaseProvider::getDb()->execute($updateSql, [$price, $id]);

我想要这样的东西，但它没有用

UPDATE oxarticles SET 
nrseriesprice = (SELECT oxprice from oxarticles where oxparentid = ? and nrseriesarticle = 1) 
WHERE oxid = ?

Answer 1

您只需要一个查询，如下所示

CREATE TABLE parent (oxid int ,nrseriesprice DECIMAL (10,2))

INSERT INTO parent VALUES (1,NULL)

CREATE TABLE oxarticles (oxprice DECIMAL(19,2), oxparentid int,nrseriesarticle int)

INSERT INTO oxarticles VALUES (19.2,1,1)

UPDATE parent p SET 
nrseriesprice = (SELECT oxprice from oxarticles where oxparentid = p.oxid and nrseriesarticle = 1) 
WHERE p.oxid = 1

SELECT * FROM parent

氧化 | nrseries价格
---: | ------------:
   1 | 19.20

db<>在这里摆弄