sorting error in union query

Question

SELECT DISTINCT rt . d_rev_id , rt . d_rev_code , rt . d_reason , rt . d_rev_status , rt . d_apb , rt . d_cb , pt . d_partid , pt . d_part_no , pt . d_ab , pt . d_abd , pt . d_status , rt . d_part_name , rt . d_part_desc , rt . d_part_type , pnv . d_pn_val , pnv . d_pn_id , cfv . d_optionname , rt . d_projectid , rt . d_abd , rt . d_apbd 
FROM 
    ( 
        ( 
        design_parts pt 
        INNER JOIN design_part_number_val pnv 
        USING ( d_partid ) 
        INNER JOIN design_revision_temp rt 
        USING ( d_partid ) 
        ) 
    LEFT JOIN design_pn_custom_field_options cfv 
    ON d_optionvalue = d_pn_val 
    )
WHERE rt . d_projectid = 1 
AND 1 
GROUP BY d_rev_id 
UNION ALL 
SELECT DISTINCT dr . d_rev_id , dr . d_rev_code , dr . d_reason , dr . d_part_name , dr . d_apb , dr . d_cb , pt . d_partid , pt . d_part_no , pt . d_ab , pt . d_abd , pt . d_status , dr . d_part_name , dr . d_part_desc , dr . d_part_type , pnv . d_pn_val , pnv . d_pn_id , cfv . d_optionname , dr . d_projectid , dr . d_apbd , dr . d_cbd 
FROM 
    ( 
        ( 
        design_parts pt 
        INNER JOIN design_part_number_val pnv 
        USING ( d_partid ) 
        INNER JOIN design_revision dr 
        USING ( d_partid ) 
        ) 
    LEFT JOIN design_pn_custom_field_options cfv 
    ON d_optionvalue = d_pn_val 
    ) 
WHERE dr . d_projectid = 1 
AND 1 
GROUP BY d_partid  
ORDER BY `rt.d_abd` ASC

What is wrong in this query as I ordering the field that are selected. I am getting an Error "*#1054 - Unknown column 'rt.d_abd' in 'order clause' "*. Please help me

Answer 1

The error is that you put tablename.columnname between backticks: MySQL interprets that as one columnname.

Either use `tablename`.`columnname` or no backticks at all.

Answer 2

ORDER BY `rt.d_abd` ASC

should be

ORDER BY `rt`.`d_abd` ASC

or

ORDER BY rt.d_abd ASC

EDITED you can use single quotes also work

ORDER BY 'rt.d_abd' ASC

I think you are not using proper syntax use ( and ) properly

it should as follow

(SELECT column1. column2
FROM table1)
UNION ALL
(SELECT column3, column4
FROM table2)
ORDER BY column1

Answer 3

Try this query:

(SELECT DISTINCT rt . d_rev_id , rt . d_rev_code , rt . d_reason , rt . d_rev_status , rt . d_apb , rt . d_cb , pt . d_partid , pt . d_part_no , pt . d_ab , pt . d_abd , pt . d_status , rt . d_part_name , rt . d_part_desc , rt . d_part_type , pnv . d_pn_val , pnv . d_pn_id , cfv . d_optionname , rt . d_projectid , rt . d_abd , rt . d_apbd 
FROM 
    design_parts pt 
    INNER JOIN design_part_number_val pnv 
    USING ( d_partid ) 
    INNER JOIN design_revision_temp rt 
    USING ( d_partid ) 
    LEFT JOIN design_pn_custom_field_options cfv 
    ON d_optionvalue = d_pn_val 
WHERE rt . d_projectid = 1 
GROUP BY d_rev_id)
UNION ALL 
(SELECT DISTINCT dr . d_rev_id , dr . d_rev_code , dr . d_reason , dr . d_part_name , dr . d_apb , dr . d_cb , pt . d_partid , pt . d_part_no , pt . d_ab , pt . d_abd , pt . d_status , dr . d_part_name , dr . d_part_desc , dr . d_part_type , pnv . d_pn_val , pnv . d_pn_id , cfv . d_optionname , dr . d_projectid , dr . d_apbd , dr . d_cbd 
FROM 
    design_parts pt 
    INNER JOIN design_part_number_val pnv 
    USING ( d_partid ) 
    INNER JOIN design_revision dr 
    USING ( d_partid ) 
    LEFT JOIN design_pn_custom_field_options cfv 
    ON d_optionvalue = d_pn_val 
WHERE dr . d_projectid = 1 
GROUP BY d_partid)
ORDER BY `d_abd` ASC