Question

我试图返回＆＃34;增加调整＆＃34;或者＆＃34;减少调整＆＃34;取决于＆＃34;金额＆＃34;列为正面或负面。

2.8.7

任何建议都将不胜感激......

编辑：整个选择=：

CASE amount
when amount > 0 then "Increase Adjustment"
when amount < 0 then "Decreased Adjustment"
else "ERROR"
end as 
transaction_type

Answer 1

怎么样：

CASE
when amount > 0 then "Increase Adjustment"
when amount < 0 then "Decreased Adjustment"
else "ERROR"
end as 
transaction_type

Answer 2

因为你用

开始你的陈述

CASE amount

您在数量上指定了一个简单的CASE表达式，这意味着WHEN子句只能是等式检查。尝试搜索表达式：

CASE
when amount > 0 then "Increase Adjustment"
when amount < 0 then "Decreased Adjustment"
else "ERROR"
end as 
transaction_type

更多信息：https://docs.microsoft.com/en-us/sql/t-sql/language-elements/case-transact-sql?view=sql-server-2017

Answer 3

CASE
when amount > '0' then "Increased Adjustment"
when amount < '0' then "Decreased Adjustment"
else "ERROR"
end as 
transaction_type

Answer 4

select tx_date, bank_account, description, amount, currency, 
CASE 
    when bank_account ='CAD-FTX' then 'Suspense_CAD' 
    when bank_account = 'USD-PRO' then 'Suspense_USD' 
    when bank_account = 'CAD-PRO' then 'Suspense_CAD' 
    when bank_account = 'USD-ALL' then 'Suspense_USD' 
    when bank_account = 'TD-USA' then 'Suspense_USD' 
end suspense_account, 
CASE 
    when cast(amount as float) > 0 then 'Increase Adjustment' 
    when cast(amount as float) < 0 then 'Decreased Adjustment' 
end 
transaction_type 
from [sys_tx_combined]

Answer 5

这是编写表达式的更简单方法：

select tx_date, bank_account, description, amount, currency,
       (case when bank_account in ('CAD-FTX', 'CAD-PRO')
             then 'Suspense_CAD'
             when bank_account in ('USD-PRO', 'USD-ALL', 'TD-USA')
             then 'Suspense_USD'
         end) suspense_account,
       (case when amount > 0 then 'Increase Adjustment'
             when amount < 0 then 'Decreased Adjustment'
        end) as transaction_type
from [sys_tx_combined];

注意：

使用case表达式进行此类映射时，我更喜欢为每个输出条件设置一个条件，而不是每个输入都有一个条件。
cast(amount as float)几乎肯定不是必需的，所以我将其删除了。
对字符串常量使用单引号，即使您的数据库支持双引号（这些也应该用于其他目的）。

SQL：CASE WHEN不工作

5 个答案: