案例语句中的计数函数

Question

我有以下统计成员的查询：

`SELECT 
distinct count(cst_recno) AS [Member ID],
adr_country AS Country
FROM 
mb_membership
JOIN mb_member_type on mbt_key = mbr_mbt_key
JOIN co_customer ON cst_key=mbr_cst_key and mbr_delete_flag =0 and 
cst_delete_flag=0 
LEFT JOIN co_individual ON cst_key=ind_cst_key and ind_delete_flag=0
LEFT JOIN co_customer_x_customer ON cxc_cst_key_1 = co_customer.cst_key and 
(cxc_end_date is null or datediff(dd,getdate(),cxc_end_date) >=0) and 
cxc_rlt_code='Chapter Member' 
LEFT JOIN co_chapter ON cxc_cst_key_2=chp_cst_key 
LEFT JOIN co_customer_x_address ON cst_cxa_key=cxa_key 
LEFT JOIN co_address ON adr_key=cxa_adr_key 
LEFT JOIN co_country on adr_country=cty_code
LEFT JOIN co_region on rgn_key=cty_rgn_key 
LEFT JOIN vw_client_uli_member_type  WITH (NOLOCK)  ON cst_key=mem_cst_key 
WHERE mbr_join_date >= '7/1/2015' and mbt_code not like '%Council%'
AND ind_int_code <> 'staff' and cst_org_name_dn not like '%urban land ins%' 
and cst_eml_address_dn not like '%@uli.org'
and adr_country ='singapore'
group by adr_country`

查询返回：

Member ID   Country
145         Singapore

但是，我知道它包含一些重复项，因为当我取出一个计数函数并且没有 group by 子句时，它会返回 140 个不同的行。 当我检查为什么它包含一些欺骗时，它是由日期之一引起的。 你能建议吗？我基本上想运行将显示 140 个不同的成员 ID 计数的查询：

Member ID   Country
140         Singapore

Answer 1

用SELECT count(distinct cst_recno)...代替SELECT distinct count(cst_recno)...：

SELECT 
count(distinct cst_recno) AS [Member ID],
adr_country AS Country
FROM 
mb_membership
JOIN mb_member_type on mbt_key = mbr_mbt_key
JOIN co_customer ON cst_key=mbr_cst_key and mbr_delete_flag =0 and 
cst_delete_flag=0 
LEFT JOIN co_individual ON cst_key=ind_cst_key and ind_delete_flag=0
LEFT JOIN co_customer_x_customer ON cxc_cst_key_1 = co_customer.cst_key and 
(cxc_end_date is null or datediff(dd,getdate(),cxc_end_date) >=0) and 
cxc_rlt_code='Chapter Member' 
LEFT JOIN co_chapter ON cxc_cst_key_2=chp_cst_key 
LEFT JOIN co_customer_x_address ON cst_cxa_key=cxa_key 
LEFT JOIN co_address ON adr_key=cxa_adr_key 
LEFT JOIN co_country on adr_country=cty_code
LEFT JOIN co_region on rgn_key=cty_rgn_key 
LEFT JOIN vw_client_uli_member_type  WITH (NOLOCK)  ON cst_key=mem_cst_key 
WHERE mbr_join_date >= '7/1/2015' and mbt_code not like '%Council%'
AND ind_int_code <> 'staff' and cst_org_name_dn not like '%urban land ins%' 
and cst_eml_address_dn not like '%@uli.org'
and adr_country ='singapore'
group by adr_country`