Case語句的MySql

Question

蔭嘗試寫爲下面的表結構的CASE語句：如果

CASE WHEN (tender_cust_shortcode = 'HAL Hydera' OR 'HAL ARDC') THEN 'N/A' 
    WHEN (tender_cust_shortcode != 'HAL Hydera' OR 'HAL ARDC') AND open_auth_date IS NULL 
THEN 'Pending' 
ELSE 'Completed' END AS `Open Auth Status` 

的標準是

1）：

======================================== 
tender_cust_shortcode | open_auth_date 
======================================== 
HAL Hydera   | 24-01-2016 
DRDL     | NULL 
HAL ARDC    | 10-02-2016 
DLRL     | NULL 
ISAC     | NULL 
======================================== 

我的CASE語句如下（tender_cust_shortcode ='HAL Hydera'或'HAL ARDC'）那麼它應該是'不適用' hortcode！='HAL Hydera'或'HAL ARDC'）並且open_auth_date IS NULL，那麼它應該導致爲'Pending'

3）Else'Completed'。

Iam沒有得到所需的輸出。可能是AND或OR條件問題。請任何人都可以幫助我呢？

Answer 1

嘗試使用IN，不知道這是否有效，但嘗試它：

CASE 
    WHEN tender_cust_shortcode IN ('HAL Hydera', 'HAL ARDC') THEN 'N/A' 
    WHEN tender_cust_shortcode NOT IN ('HAL Hydera', 'HAL ARDC') AND open_auth_date IS NULL THEN 'Pending' 
    ELSE 'Completed' 
END AS `Open Auth Status` 

這裏是SQLFiddle Demo，它的工作原理。:-)

Answer 2

你必須repead列名，或不平等的條件必須由AND連接：

CASE WHEN (tender_cust_shortcode = 'HAL Hydera' OR tender_cust_shortcode = 'HAL ARDC') THEN 'N/A' 
    WHEN (tender_cust_shortcode != 'HAL Hydera' AND tender_cust_shortcode != 'HAL ARDC') AND open_auth_date IS NULL 
THEN 'Pending' 
ELSE 'Completed' END AS `Open Auth Status` 

見SQLFiddle

Answer 3

嘗試這樣的查詢：

SELECT CASE WHEN (tender_cust_shortcode = 'HAL Hydera' OR 'HAL ARDC') THEN 'N/A' 
WHEN ((tender_cust_shortcode != 'HAL Hydera' OR 'HAL ARDC') AND (open_auth_date IS NULL)) THEN 'Pending' 
ELSE 'Completed' END FROM `test`