Case语句的MySql

Question

荫尝试写为下面的表结构的CASE语句：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` 

的标准是

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语句如下（tender_cust_shortcode ='HAL Hydera'或'HAL ARDC'）那么它应该是'不适用' hortcode！='HAL Hydera'或'HAL ARDC'）并且open_auth_date IS NULL，那么它应该导致为'Pending'

3）Else'Completed'。

Iam没有得到所需的输出。可能是AND或OR条件问题。请任何人都可以帮助我呢？

Answer 1

尝试使用IN，不知道这是否有效，但尝试它：

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` 

这里是SQLFiddle Demo，它的工作原理。:-)

Answer 2

你必须repead列名，或不平等的条件必须由AND连接：

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` 

见SQLFiddle

Answer 3

尝试这样的查询：

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`