woocommerce mysql price table
//for Regular Price
UPDATE wp_postmeta
SET meta_value = diff_price_value
WHERE post_id = variation_id AND meta_key = '_regular_price';
//for Price
UPDATE wp_postmeta
SET meta_value = price_value
WHERE post_id = variation_id AND meta_key = '_price';
//for Sale Price
UPDATE wp_postmeta
SET meta_value = price_value
WHERE post_id = variation_id AND meta_key = '_sale_price';