Select Sql 中条件错误的语句

Question

我是 Sql 的新手。我有两个 table，如果基于第一个 table 字段的条件错误，我需要从第二个 table 获取数据，如下所示：

第一个Table

(SELECT branch, division, position_code, emp_code, 
 div_brand, div_brand_targets_t2
 FROM sas_provBrand_targets 
) TRGT

然后我需要根据 TRGT.div_brand 的值从第二个 table 制作 Select 如下：

IF TRGT.div_brand IN ('Other', 'HPC1', 'HPC2')
THEN 
{
 Brand = null
 Category = null
 Subcategory = null
}
ELSE
{
 (SELECT DISTINCT BRAND, REP_BRAND, category, rep_category, 
  sub_category, SUB_CATEGORY_DESCRIPTION 
  FROM masterdata.dbo.inventory_item
  WHERE sub_category = TRGT.div_brand
 ) BRNDNAME 
}

最后我需要获取如下数据在前端显示

SELECT DISTINCT TRGT.branch BRANCH, TRGT.division DIVISION, TRGT.POSITION_CODE POSITION,
TRGT.emp_code SALESMAN, BRNDNAME.brand  + ' - ' +  BRNDNAME.rep_brand BRAND, BRNDNAME.category + ' - ' + BRNDNAME.rep_category CATEGORY, BRNDNAME.sub_category + ' - ' + BRNDNAME.SUB_CATEGORY_DESCRIPTION SUBCATEGORY,  TRGT.div_brand_targets_t2 BRANDT2

Tables 结构（注意它们是联合国关系 tables ） sas_provBrand_targetsTable

yr: numeric(4, 0)
mnth: numeric(2, 0)
branch: char(4)
division: char(4)
position_code: numeric(3, 0)
emp_code: char(5)
div_brand: varchar(25)
div_brand_targets_t2: numeric(15, 2)

masterdata.dbo.inventory_item

division: char(6)
brand: char(5)
rep_brand: varchar(40)
category: char(6)
rep_category: varchar(40)
sub_category: char(8)
SUB_CATEGORY_DESCRIPTION: varchar(20)

Answer 1

首先，SQL 认为集合论不是逐行操作。达到你想要的结果集的诀窍是加入一切。

SELECT CASE WHEN TRGT.div_brand IN ('Other', 'HPC1', 'HPC2') THEN NULL ELSE BRNDNAME.BRAND END AS BRAND 
 FROM sas_provBrand_targets TRGT

LEFT/INNER>?? JOIN
(SELECT DISTINCT BRAND, REP_BRAND, category, rep_category, 
  sub_category, SUB_CATEGORY_DESCRIPTION 
  FROM masterdata.dbo.inventory_item
  WHERE 
 ) BRNDNAME ON sub_category = TRGT.div_brand

对每一列重复 case 语句，并将所需的列/格式添加到主 select

Select Sql 中条件错误的语句

Select Statement If Condition is Wrong in Sql

sql

select

case