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Suppose I store all my post meta data in an array like

$meta = array(
    'img' => '',
    'caption' => ''
);

update_post_meta($post->ID, 'theme_banner', $meta);

Can I query posts where the img is filled?

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up vote 2 down vote accepted

Short answer: NO!

I've asked a similar question before mysql order by serialized data? and the answer i got is:

The only possible case when serialized data is acceptable is when you don't need to search , filter or order by through that data. In all other cases - store your data as a separated fields.

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