Question

我有一张桌子，里面有一些会员和他们的卡。共有3种独特类型的卡，即ADIB，ADCB和NBAD。一个人可能拥有一张以上的卡，并且一个人可能拥有一种以上的卡，即2张ADIB卡。

下面是我的查询，如何优化它？

create table #cobrand(grp_number nvarchar(12), partner varchar(5))

insert
into #cobrand
select distinct c_grp_number grp_number, 'NBAD' partner from partnership_cards c where partner_name = 'NBAD'
and not exists (select grp_number from #cobrand t where c.c_grp_number = t.grp_number)

insert into #cobrand
select distinct c_grp_number grp_number, 'ADIB' partner from partnership_cards c where partner_name = 'ADIB'
and not exists (select grp_number from #cobrand t where c.c_grp_number = t.grp_number)

insert into #cobrand
select distinct c_grp_number grp_number, 'ADCB' partner from partnership_cards c where partner_name = 'ADCB'
and not exists (select grp_number from #cobrand t where c.c_grp_number = t.grp_number)

Answer 1

也许..？

INSERT INTO #cobrand
SELECT DISTINCT
       c_grp_number AS grp_number,
       partner_name AS partner
FROM partnership_cards c
WHERE partner_name IN ('NBAD','ADCB','ADIB')
  AND NOT EXISTS(SELECT 1
                 FROM partnership_cards e
                 WHERE e.c_grp_number = c.c_grp_number
                   AND ((c.partner_name IN ('ADCB','ADIB') AND e.partner_name = 'NBAD')
                    OR  (c.partner_name = 'ADIB' AND e.partner_name IN ('NBAD','ADCB')));

尽管没有示例数据也无法进行测试。

Answer 2

如@Larnu所说，没有测试数据就无法进行测试

INSERT INTO #cobrand
SELECT DISTINCT
    c_grp_number
    ,c.partner_name
FROM
    partnership_cards c
WHERE
    c.partner_name IN ( 'NBAD', 'ADCB', 'ADIB' )
AND NOT EXISTS (
    SELECT  1
    FROM
        #cobrand t
    WHERE
        c.c_grp_number  = t.grp_number
    AND c.partner_name  = t.[partner]
) ;

Answer 3

select c_grp_number, partner_name from 
        (select c_grp_number, partner_name, 
            row_number() over (partition by c_grp_number order by partner_name desc)
        as flag
        from sameer_db..etihad_partnership_cards_temp
        where card_status = 'Active' and partner_name in ('NBAD', 'ADIB', 'ADCB'))t
        where flag = 1

如何优化我的SQL Server查询？

3 个答案: