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原标题:SQL - Exclude a row based on another value in the same table
  • 时间:2011-10-20 01:34:05
  •  标签:
  • mysql

所涉申请是一个分类地点。 在称为“cp_price”的领域中,用电回一个价值,为系统中的所有列名带来总价值。

我的目标是排除所有在“cp_ad_sold”领域具有“yes”价值的列名。

The query I m using to rec the Value:

$raw_prices = $wpdb->get_col( $wpdb->prepare( "     
    SELECT pm.meta_value FROM {$wpdb->postmeta} AS pm 
    LEFT JOIN {$wpdb->posts} AS p ON p.ID = pm.post_id 
    WHERE p.post_type =  ad_listing 
    AND p.ID = pm.post_id
    AND pm.meta_key =  cp_price 
    " ) );

因此,我是guessing。 我需要做一个次选?

我知道,我所需要的关键和各自价值与“价格”领域一起储存在后元表中。 我还知道,“cp_price”和“cp_ad_sold”同“post_id”。

< Question: 我如何根据“cp_ad_sold”的钥匙中的“yes”价值,排除被列入名单者及其各自的价格价值?

注:我用言语作此用,并考虑了将问题放在口头上。 我将这个问题视为一个基础很强的问题,但这一数字是最合适的地点。

问题回答

您也希望加入《家庭福利法》条款的一个条件——

$raw_prices = $wpdb->get_col( $wpdb->prepare( "     
    SELECT pm.meta_value FROM {$wpdb->postmeta} AS pm 
    LEFT JOIN {$wpdb->posts} AS p ON p.ID = pm.post_id 
    WHERE p.post_type =  ad_listing 
    AND p.ID = pm.post_id -- Do you really need it? Check LEFT JOIN ... ON clause
    AND pm.meta_key =  cp_price 
    AND cp_ad_sold <>  yes  -- Something like this
    " ) );




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