Question

我试图为下面的表结构写一个CASE语句：

========================================
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声明如下：

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`

标准是

1）if（tender_cust_shortcode =＆＃39; HAL Hydera＆＃39; OR＆＃39; HAL ARDC＆＃39;）然后它应该导致＆＃39; N / A＆＃39;

2）if（tender_cust_shortcode！=＆＃39; HAL Hydera＆＃39; OR＆＃39; HAL ARDC＆＃39;）和open_auth_date IS NULL然后它应该导致＆＃39;等待＆＃39;

3）Else＆＃39;已完成＆＃39;。

我没有得到所需的输出。可能是AND或OR条件问题。请有人帮我这个吗？

Answer 1

尝试使用IN，不确定这是否有效，但请尝试一下：

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`

这是SQLFiddle Demo，它有效。： - ）

Answer 2

您必须重复列名称，并且必须通过AND连接或者不相等条件：

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`

请参阅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`

案例陈述MySql

3 个答案: