sql - ERROR: duplicate key value violates unique constraint in postgres -

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here slo_order_item_id unique constraint 

 insert shb.sale_order                 (                            slo_order_item_id,                            slo_order_id,                            slo_channel,                            slo_status,                            slo_channel_status,                            slo_order_date,                            slo_dispatch_by_date,                            slo_sku,                            slo_quantity,                             slo_selling_price,                            slo_shipping_charge,                             slo_vendor_id                )    select distinct vss_order_item_id,           vss_order_id,           vss_channel_name,           vss_sale_order_item_status,           vss_sale_order_item_status,           case when is_date(vss_order_date) vss_order_date::date else null end,          case when is_date(vss_dispatch_date) vss_dispatch_date::date else null end,          vss_sku,           1,            vss_selling_price,           vss_shipping_charge,            vss_vendor_id      imp.vendor_sale_staging  udt   not exists (select 1 shb.sale_order  slo_order_item_id = udt.vss_order_item_id);

and try 

where vss_order_item_id not in (select slo_order_item_id shb.sale_order);

but these both giving error.

error: duplicate key value violates unique constraint "unique_sale_order_slo_order_item_id" detail: key (slo_order_item_id)=(1027559930) exists.

why giving error ? 1 where condition work fast , why ?

you may have duplicate values in staging table. can check doing:

select vss_order_item_id, count(*) imp.vendor_sale_staging group vss_order_item_id having count(*) > 1;

if case, suggest fixing staging table. but, fast hack load use distinct on rather distinct:

select distinct on (vss_order_item_id) . . . imp.vendor_sale_staging udt not exists (select 1 shb.sale_order  slo_order_item_id = udt.vss_order_item_id) order vss_order_item_id;

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