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// %s (string)// %d (integer)// %f (float)// like % -> like %%$wpdb->prepare// select$wpdb->get_results // multi row, multi column$wpdb->get_row // one row, multi column$wpdb->get_col // multi row, one column$wpdb->get_var // one value (one row, one column)// insert, update, delete$wpdb->query$query = $wpdb->prepare( "INSERT INTO $wpdb->postmeta ( post_id, meta_key, meta_value..