MySQL Query Error:
select BE.ID
from
b_iblock_element BE
INNER JOIN b_iblock_section_element BSE ON BSE.IBLOCK_ELEMENT_ID = BE.ID AND BSE.ADDITIONAL_PROPERTY_ID IS NULL
INNER JOIN b_iblock_section BS ON BS.ID = BSE.IBLOCK_SECTION_ID
INNER JOIN b_iblock_section BSP ON BS.IBLOCK_ID = BSP.IBLOCK_ID AND BS.LEFT_MARGIN >= BSP.LEFT_MARGIN AND BS.RIGHT_MARGIN <= BSP.RIGHT_MARGIN
INNER JOIN b_iblock_section BS0 ON BS0.ID = BSP.ID
INNER JOIN b_iblock_section BS1 ON BS1.ID = BS0.IBLOCK_SECTION_ID
INNER JOIN b_iblock_section BS2 ON BS2.ID = BS1.IBLOCK_SECTION_ID
WHERE BE.IBLOCK_ID = 20
AND BE.CODE = 'plintus_evroplast_interer_1_53_104'
AND BS0.CODE = 'interer'
AND BS1.CODE = 'evroplast'
AND BS2.CODE = 'lepnoy_dekor'
[MySQL server has gone away]