Question

如何重命名该值？它给了我IN（）子句中最后选择的值。

SELECT cf_1573, SUM(counter) AS lyncs 
FROM (
 SELECT 
  cf_1573,
  COUNT(cf_1573) AS counter 
 FROM vtiger_purchaseordercf 
 WHERE cf_1573
 IN('Lync Front End (Std)','Lync Front End (Ent)','Lync Backend',
    'Lync Edge','Lync SBA','Lync DNS Checks','Lync Certificate Checks')
 GROUP BY cf_1573
) AS mslync

我有这个输出：

cf_1573                 |lyncs
Lync Certificate Checks | 8

sub-query给了我这个：

cf_1573                 | counter
Lync Certificate Checks | 1
Lync DNS Check          | 3
Lync Edge               | 1
Lync SBA                | 3

我希望输出显示“Data Lync”而不是“Lync Certificate Checks”，这是我IN() clause中的最后一个值。谢谢你的帮助。

Answer 1

尝试以下查询。

SELECT 'Data Lync' as `cf_1573`, SUM(counter) AS lyncs 
FROM (
 SELECT 
  cf_1573,
  COUNT(cf_1573) AS counter 
 FROM vtiger_purchaseordercf 
 WHERE cf_1573
 IN('Lync Front End (Std)','Lync Front End (Ent)','Lync Backend',
    'Lync Edge','Lync SBA','Lync DNS Checks','Lync Certificate Checks')
 GROUP BY cf_1573
) AS mslync

Answer 2

您可以在适用时使用CASE

SELECT 
cf_1573  = CASE 
           WHEN cf_1573 = 'Lync Certificate Checks' THEN 'Data Lync' 
           ELSE cf_1573 
          END  , 
SUM(counter) AS lyncs 
FROM
(  SELECT 
   cf_1573, 
   COUNT(cf_1573) AS counter
   FROM vtiger_purchaseordercf 
   WHERE cf_1573  IN ('Lync Front End (Std)','Lync Front End (Ent)',
                      'Lync Backend','Lync Edge','Lync SBA','Lync DNS Checks',
                      'Lync Certificate Checks')GROUP BY cf_1573) AS mslync
                     )
)table_A

重命名MYSQL中的选定行

2 个答案: